When built against a target with hardware dfp, The GCC callouts for soft-dfp functions (https://gcc.gnu.org/onlinedocs/gccint/Decimal-float-library-routines.html) are mostly inlined.

Libdfp builds these functions to provide compatibility with libraries built against soft-dfp but may be run against a library with hardware support on targets which implement dfp in hardware.

Some basic tests should be added to perform basic sanity tests of these functions. E.g the target compiler is correctly inlining the code, or the target specific override behaves correctly.

The build system does not check included for files, leaving incremental builds in broken states.

Test: log10 (3.141592653589793238462643383279503)
Result:
is: 4.97149872694133800000e-01 4.971498726941338e-01
should be: 4.97149872694133900000e-01 4.971498726941339e-01
difference: 1.00000000000000000000e-16 1.000000000000000e-16
ulp : 1.0000
max.ulp : 1.0000

Libdecnumber doesn't appear to be used, but it is about 3 years behind gcc. On x86_64 / BID encoding, the endian is swapped, so it doesn't work with the current gcc _DecimalXX encoding. The gcc version of libdecnumber does works with the builtin type. I've pulled out libdecnumber from gcc here: https://github.com/raitechnology/libdecnumber

I'm not sure of the gcc status of _DecimalXX, since the g++ 8 distributed with FC28 no longer has _DecimalXX types unless I'm missing an cmd line option (disabled in favor of std::decimal ??).

I can merge the libgcc version into libdfp and do a pull request if that is useful.

Excerpt from @jsm28:

Any libdfp integration in glibc would I expect also look very different,
as regards build system and general integration, from either the present
build system or the old add-on version. For example, functions would be
declared directly in the relevant headers under appropriate __GLIBC_USE
conditionals (in bits/mathcalls.h in many cases - most functions should be
present for both binary and decimal types). Tests would use the libm-test
/ auto-libm-test machinery, adapted as necessary to support DFP; the vast
bulk of test inputs to most functions should be applicable to both binary
and decimal floating point. (The actual function implementations would I
expect not need changing much for glibc.)

Source: https://sourceware.org/ml/libc-alpha/2017-09/msg00823.html

Hi,
when building libdfp 1.0.14 on ppc64el, ppc64 and powerpc on current debian unstable (gcc 8.3), the test test-cast-to-underflow fails. Here is an extract on ppc64el :

21  Error:   Expected: "0x0p+0"
              Result:   "0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:143

22  Error:   Expected: "-0x0p+0"
              Result:   "-0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:144

29  Error:   Expected: "0x0.0000000000001p-1022"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:151

30  Error:   Expected: "-0x0.0000000000001p-1022"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:153

31  Error:   Expected: "0x0.0000000000001p-1022"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:155

32  Error:   Expected: "-0x0.0000000000001p-1022"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:156

45  Error:   Expected: "0x0.0000000000001p-1022"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:169

46  Error:   Expected: "-0x0.0000000000001p-1022"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:171

59  Error:   Expected: "0x0.0000000000001p-1022"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:186

60  Error:   Expected: "-0x0.0000000000002p-1022"
              Result:   "-0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:188

73  Error:   Expected: "0x0.0000000000002p-1022"
              Result:   "0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:203

74  Error:   Expected: "-0x0.0000000000001p-1022"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:205

83  Error:   Expected: "0x0p+0"
              Result:   "0x1p-149"
in: ./tests/test-cast-to-underflow.c:219

84  Error:   Expected: "-0x0p+0"
              Result:   "-0x1p-149"
in: ./tests/test-cast-to-underflow.c:220

91  Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:227

92  Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:229

93  Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:231

94  Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:232

95  Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:233

96  Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:234

109 Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:247

110 Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:249

111 Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:251

112 Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:252

123 Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:264

124 Error:   Expected: "-0x1p-148"
              Result:   "-0x1p-149"
in: ./tests/test-cast-to-underflow.c:266

125 Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:268

126 Error:   Expected: "-0x1p-148"
              Result:   "-0x1p-149"
in: ./tests/test-cast-to-underflow.c:269

137 Error:   Expected: "0x1p-148"
              Result:   "0x1p-149"
in: ./tests/test-cast-to-underflow.c:281

138 Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:283

139 Error:   Expected: "0x1p-148"
              Result:   "0x1p-149"
in: ./tests/test-cast-to-underflow.c:285

140 Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:286

145 Error:   Expected: "0x0p+0"
              Result:   "0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:295

146 Error:   Expected: "-0x0p+0"
              Result:   "-0x0.0000000000001p-1022"
in: ./tests/test-cast-to-underflow.c:296

195 Error:   Expected: "0x1p-149"
              Result:   "0x0p+0"
in: ./tests/test-cast-to-underflow.c:349

196 Error:   Expected: "-0x1p-149"
              Result:   "-0x0p+0"
in: ./tests/test-cast-to-underflow.c:350

Found 36 failures.

Fred

decimal32 and decimal64 have high ulps (15 and 13 respectively) with the input 88.72269439697265625.

It's happening on ppc64 and ppc64le, with different distributions.

Output of test-fabs-d128:
Failure: Test: fabs (-42)
Result:
is: -4.20000000000000000000e+01 -4.2000000000000000000000000000000000e+01
should be: 4.20000000000000000000e+01 4.2000000000000000000000000000000000e+01
difference: -8.40000000000000000000e+01 -8.4000000000000000000000000000000000e+01
ulp : -8400000000000000000000000000000000.0000
max.ulp : 0.0000
Failure: Test: fabs (-2.718281828459045235360287471352662)
Result:
is: -2.71828182845904523536e+00 -2.7182818284590452353602874713526620e+00
should be: 2.71828182845904523536e+00 2.7182818284590452353602874713526620e+00
difference: -5.43656365691809047072e+00 -5.4365636569180904707205749427053240e+00
ulp : -5436563656918090470720574942705324.0000
max.ulp : 0.0000

TS 18661-2 states it should be equivalent to x * 10 ^ y.

I noticed this recently, but it seems to be affecting older revisions.
I was able to reproduce it on Debian 8. The kernel is ppc64, but I was building for ppc.

configure --build=powerpc-linux --host=powerpc-linux
...
$ cat check-localplt.out 
Extra PLT reference: libdfp.so: register_printf_dfp@@LIBDFP_1.0.0
Missing required PLT reference: libdfp.so: register_printf_dfp

The existing long double <-> _Decimal128 conversion functions assume IBM long double. This is not always correct.

"./configure && make && make check" Running on a POWER8 RHEL7.1 LE, and BE host:

LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions 2> ./test-bfp-conversions.out 1> /dev/null /bin/sh: line 1: 16985 Segmentation fault LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions 2> ./test-bfp-conversions.out > /dev/null make: *** [test-bfp-conversions.out] Error 139

On a POWER8 Ubuntu 14.04 LE host (Not a segfault, likely the same as Issue 3):

gcc -DSHARED -O2 -fpic -g -DNOT_IN_libdfp -I../tests -Wl,--no-as-needed ./test-bfp-conversions.os -o test-bfp-conversions -lc -lm -L./ -ldfp LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions 2> ./test-bfp-conversions.out 1> /dev/null make: *** [test-bfp-conversions.out] Error 137

On a POWER8 SLES 12 host:

gcc -DSHARED -O2 -fpic -g -DNOT_IN_libdfp -I../tests -Wl,--no-as-needed ./test-bfp-conversions.os -o test-bfp-conversions -lc -lm -L./ -ldfp LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions 2> ./test-bfp-conversions.out 1> /dev/null /bin/sh: line 1: 15991 Segmentation fault LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions 2> ./test-bfp-conversions.out > /dev/null Makefile:391: recipe for target 'test-bfp-conversions.out' failed make: *** [test-bfp-conversions.out] Error 139

These are built from SHA 05ec25f when testing for release improvements.

x86-64 expects these to be return as a long. This causes strange and confusing failures when gcc performs comparisons. I.e -1 < 0.

This appears to be an issue with the return type of the comparison functions as the word size on x86-64 is not the same size as an int.

Seems like we have lots of trailing white spacing and the code is not standardized (looks like GNU, but there's lots of things that doesn't follow the code standard). I am creating a task to check what standard to follow and fix accordingly.

O.S. : Centos7 64 bits
GCC : 4.9.3
libdfp: master

#define __STDC_WANT_DEC_FP__

#include <math.h>
#include <fenv.h>
#include <stdlib.h>
#include <wchar.h>
#include <stdio.h>

main()
{
        _Decimal64 a = 9.853946746503084DD;
        printf("%Da * 1000 = %Da\n", a, a * 1000.0DD);
        return 0;
}

result :

9.853946746503084 * 1000 = 98539467.46503084

long double type should, depending on the rounding mode, return INFINITY when overflow instead, it returns NaN. For example, the attached test converting 1e1000DL to long double produces (on POWER8 little-endian):

#include <fenv.h>                                                               
#include <float.h>                                                               
#include <math.h>

int                                                                             
main (void)                                                                     
{ 
  volatile long double;
  volatile _Decimal128 a = 1e1000DL;    
  fesetround (FE_TONEAREST);                                                    
  b = (long double)  a;
  return b != INFINITY; 
} 

The expected result should be inf instead nan.

At least some libdfp conversions between decimal and binary types wrongly convert values in the subnormal range of the target type to zero instead of a subnormal. For example, for conversions from _Decimal128 to double, the attached test (on POWER8 little-endian) outputs:

0x0.012688b70e62bp-1022 0x0p+0

whereas if I use the libgcc conversions I get the expected:

0x0.012688b70e62bp-1022 0x0.012688b70e62bp-1022
subnormal.txt

This is generating a value with ~3 million ULPS, or more likely, a wrong value.

Hi,
while compiling on s390x, I noticed several tests failing.
Note that this was done on a qemu guest, on Debian Unstable (I'm maintaining the Debian package).
Hardening was disabled and test ouput should be displayed within the log.
Here is the build log :

F.

libdfp_1.0.13-2-1.buildlog.txt

Hi,
on ppc64 (Debian Unstable) and libdfp 1.0.13 with the hardening flag -fstack-protector-strong, this test only fails.
Can you help ? Thanks.
Here is the log of the test :

gcc  -DSHARED -O2 -Werror=format-security -Wformat -fdebug-prefix-map=/home/ubuntu/libdfp/libdfp-1.0.13=. -fpic -fstack-protector-strong -g -mno-hard-dfp -DNOT_IN_libdfp -I../tests -Wl,--no-as-needed -Wdate-time -D_FORTIFY_SOURCE=2  -MT test-bfp-conversions.os -MD -MP -MF test-bfp-conversions.d -c ../tests/test-bfp-conversions.c -D__STDC_DEC_FP__=200704L -D__STDC_WANT_DEC_FP__=1 -DOPTION_EGLIBC_LOCALE_CODE=1 -std=gnu99 -D_ISOC99_SOURCE -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute -Wno-long-long -include ./config.h -include ../include/libdfp-symbols.h  -I../include  -I../dfp  -I../dfp/decimal  -I../libdecnumber/dpd  -I../libdecnumber  -I../sysdeps/powerpc/powerpc64  -I../sysdeps/powerpc/fpu/bits  -I../sysdeps/powerpc/fpu  -I../sysdeps/powerpc  -I../sysdeps/soft-dfp/dpd  -I../sysdeps/soft-dfp  -I../sysdeps/dpd  -I../sysdeps/generic  -I../decNumberMath/  -I../ieee754/  -I../base-math/  -I..  -I. -o test-bfp-conversions.os
gcc  -DSHARED -O2 -Werror=format-security -Wformat -fdebug-prefix-map=/home/ubuntu/libdfp/libdfp-1.0.13=. -fpic -fstack-protector-strong -g -mno-hard-dfp -DNOT_IN_libdfp -I../tests -Wl,--no-as-needed  ./test-bfp-conversions.os -o test-bfp-conversions -lc -lm -L./ -ldfp
LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH ./test-bfp-conversions
1.234500e+01 = (_Decimal32) 1.234500e+01; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,012,345E-3
retval:   +1,234,500E-5
1   Success: Expected: "1.234500e+01"
              Result:   "1.234500e+01"
in: ../tests/test-bfp-conversions.c:45

1.234568e+01 = (_Decimal32) 1.234568e+01; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +1,234,568E-5
retval:   +1,234,568E-5
2   Success: Expected: "1.234568e+01"
              Result:   "1.234568e+01"
in: ../tests/test-bfp-conversions.c:46

1.234567e+05 = (_Decimal32) 1.234567e+05; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +1,234,567E-1
retval:   +1,234,567E-1
3   Success: Expected: "1.234567e+05"
              Result:   "1.234567e+05"
in: ../tests/test-bfp-conversions.c:47

9.999999e+05 = (_Decimal32) 9.999999e+05; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +9,999,999E-1
retval:   +9,999,999E-1
4   Success: Expected: "9.999999e+05"
              Result:   "9.999999e+05"
in: ../tests/test-bfp-conversions.c:48

2.000000e+00 = (_Decimal32) 2.000000e+00; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,020E-1
retval:   +0,000,002E+0
5   Success: Expected: "2.000000e+00"
              Result:   "2.000000e+00"
in: ../tests/test-bfp-conversions.c:49

3.000000e+01 = (_Decimal32) 3.000000e+01; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,300E-1
retval:   +0,000,030E+0
6   Success: Expected: "3.000000e+01"
              Result:   "3.000000e+01"
in: ../tests/test-bfp-conversions.c:50

1.000000e-20 = (_Decimal32) 1.000000e-20; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,010E-21
retval:   +1,000,000E-26
7   Success: Expected: "1.000000e-20"
              Result:   "1.000000e-20"
in: ../tests/test-bfp-conversions.c:51

0.000000e+00 = (_Decimal32) 0.000000e+00; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,000E-1
retval:   +0,000,000E-1
8   Success: Expected: "0.000000e+00"
              Result:   "0.000000e+00"
in: ../tests/test-bfp-conversions.c:52

3.402819e+38 = (_Decimal32) 3.402819e+38; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +3,402,819E+32
retval:   +3,402,819E+32
9   Success: Expected: "3.402819e+38"
              Result:   "3.402819e+38"
in: ../tests/test-bfp-conversions.c:53

1.000000e+05 = (_Decimal32) 1.000000e+05; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +1,000,000E-1
retval:   +0,100,000E+0
10  Success: Expected: "1.000000e+05"
              Result:   "1.000000e+05"
in: ../tests/test-bfp-conversions.c:54

9.999990e+05 = (_Decimal32) 9.999990e+05; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +9,999,990E-1
retval:   +0,999,999E+0
11  Success: Expected: "9.999990e+05"
              Result:   "9.999990e+05"
in: ../tests/test-bfp-conversions.c:55

1.200000e-38 = (_Decimal32) 1.200000e-38; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,012E-39
retval:   +1,200,000E-44
12  Success: Expected: "1.200000e-38"
              Result:   "1.200000e-38"
in: ../tests/test-bfp-conversions.c:56

1.100000e-38 = (_Decimal32) 1.100000e-38; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: +0,000,011E-39
retval:   +1,100,000E-44
13  Success: Expected: "1.100000e-38"
              Result:   "1.100000e-38"
in: ../tests/test-bfp-conversions.c:57

-1.200000e-38 = (_Decimal32) -1.200000e-38; /* float */ in: ../tests/test-bfp-conversions.c: 374
expected: -0,000,012E-39
retval:   -1,200,000E-44
14  Success: Expected: "-1.200000e-38"
              Result:   "-1.200000e-38"
in: ../tests/test-bfp-conversions.c:58

1.234500e+01 = (_Decimal64) 1.234500e+01; /* float */ in: ../tests/test-bfp-conversions.c: 388
expected: +1,234,500,026,702,881E-14
retval:   +1,234,500,026,702,881E-14
15  Success: Expected: "1.234500e+01"
              Result:   "1.234500e+01"
in: ../tests/test-bfp-conversions.c:73

3.000000e+01 = (_Decimal64) 3.000000e+01; /* float */ in: ../tests/test-bfp-conversions.c: 388
expected: +0,000,000,000,000,300E-1
retval:   +0,000,000,000,000,030E+0
16  Success: Expected: "3.000000e+01"
              Result:   "3.000000e+01"
in: ../tests/test-bfp-conversions.c:74

3.402819e+38 = (_Decimal64) 3.402819e+38; /* float */ in: ../tests/test-bfp-conversions.c: 388
expected: +3,402,819,004,255,176E+23
retval:   +3,402,819,004,255,176E+23
17  Success: Expected: "3.402819e+38"
              Result:   "3.402819e+38"
in: ../tests/test-bfp-conversions.c:75

1.234500e+01 = (_Decimal128) 1.234500e+01; /* float */ in: ../tests/test-bfp-conversions.c: 402
expected: +1,234,500,026,702,880,859,375,000,000,000,000E-32
retval:   +0,000,000,000,001,234,500,026,702,880,859,375E-20
18  Success: Expected: "1.234500e+01"
              Result:   "1.234500e+01"
in: ../tests/test-bfp-conversions.c:90

3.000000e+01 = (_Decimal128) 3.000000e+01; /* float */ in: ../tests/test-bfp-conversions.c: 402
expected: +0,000,000,000,000,000,000,000,000,000,000,300E-1
retval:   +0,000,000,000,000,000,000,000,000,000,000,030E+0
19  Success: Expected: "3.000000e+01"
              Result:   "3.000000e+01"
in: ../tests/test-bfp-conversions.c:91

3.402819e+38 = (_Decimal128) 3.402819e+38; /* float */ in: ../tests/test-bfp-conversions.c: 402
expected: +3,402,819,004,255,175,794,749,548,566,449,886E+5
retval:   +3,402,819,004,255,175,794,749,548,566,449,886E+5
20  Success: Expected: "3.402819e+38"
              Result:   "3.402819e+38"
in: ../tests/test-bfp-conversions.c:92

1.234568e+01 = (_Decimal64) 1.234568e+01; /* double */ in: ../tests/test-bfp-conversions.c: 416
expected: +0,000,000,123,456,789E-7
retval:   +1,234,567,890,000,000E-14
21  Success: Expected: "1.234568e+01"
              Result:   "1.234568e+01"
in: ../tests/test-bfp-conversions.c:107

-2.000000e+00 = (_Decimal64) -2.000000e+00; /* double */ in: ../tests/test-bfp-conversions.c: 416
expected: -0,000,000,000,000,020E-1
retval:   -0,000,000,000,000,002E+0
22  Success: Expected: "-2.000000e+00"
              Result:   "-2.000000e+00"
in: ../tests/test-bfp-conversions.c:108

1.797680e+308 = (_Decimal64) 1.797680e+308; /* double */ in: ../tests/test-bfp-conversions.c: 416
expected: +0,000,000,000,179,768E+303
retval:   +1,797,680,000,000,000E+293
23  Success: Expected: "1.797680e+308"
              Result:   "1.797680e+308"
in: ../tests/test-bfp-conversions.c:109

1.000000e+14 = (_Decimal64) 1.000000e+14; /* double */ in: ../tests/test-bfp-conversions.c: 416
expected: +1,000,000,000,000,000E-1
retval:   +0,100,000,000,000,000E+0
24  Success: Expected: "1.000000e+14"
              Result:   "1.000000e+14"
in: ../tests/test-bfp-conversions.c:110

1.000000e+15 = (_Decimal64) 1.000000e+15; /* double */ in: ../tests/test-bfp-conversions.c: 416
expected: +9,999,999,999,999,990E-1
retval:   +0,999,999,999,999,999E+0
25  Success: Expected: "1.000000e+15"
              Result:   "1.000000e+15"
in: ../tests/test-bfp-conversions.c:111

1.234568e+01 = (_Decimal128) 1.234568e+01; /* double */ in: ../tests/test-bfp-conversions.c: 430
expected: +1,234,567,889,999,999,934,502,739,051,822,573E-32
retval:   +1,234,567,889,999,999,934,502,739,051,822,573E-32
26  Success: Expected: "1.234568e+01"
              Result:   "1.234568e+01"
in: ../tests/test-bfp-conversions.c:126

-2.000000e+00 = (_Decimal128) -2.000000e+00; /* double */ in: ../tests/test-bfp-conversions.c: 430
expected: -0,000,000,000,000,000,000,000,000,000,000,020E-1
retval:   -0,000,000,000,000,000,000,000,000,000,000,002E+0
27  Success: Expected: "-2.000000e+00"
              Result:   "-2.000000e+00"
in: ../tests/test-bfp-conversions.c:127

1.797680e+308 = (_Decimal128) 1.797680e+308; /* double */ in: ../tests/test-bfp-conversions.c: 430
expected: +1,797,679,999,999,999,908,416,854,000,763,986E+275
retval:   +1,797,679,999,999,999,908,416,854,000,763,986E+275
28  Success: Expected: "1.797680e+308"
              Result:   "1.797680e+308"
in: ../tests/test-bfp-conversions.c:128

Segmentation fault
Makefile:413: recipe for target 'test-bfp-conversions.out' failed
make[1]: *** [test-bfp-conversions.out] Error 139

An user reported the following output from log10() as suspicious.
Investigate if they're fine or not.
Reproduced on power8.

Output:
4../test-log10-d64

...
Test: log10 (3.141592653589793238462643383279503)
Result:
is: 4.97149872694133800000e-01 4.9714987269413380e-01
should be: 4.97149872694133900000e-01 4.9714987269413390e-01
difference: 1.00000000000000000000e-16 1.0000000000000000e-16
ulp : 1.0000
max.ulp : 1.0000
...

5../test-log10-d128

...
Test: log10 (2.718281828459045235360287471352662)
Result:
is: 4.34294481903251827651e-01
4.3429448190325182765112891891660500e-01
should be: 4.34294481903251827651e-01
4.3429448190325182765112891891660510e-01
difference: -1.00000000000000000000e-34
-1.0000000000000000000000000000000000e-34
ulp : -1.0000
max.ulp : 1.0000
...

On ppc64el, there a failure on test-strtod :
$ cat test-strtod.out
104 Error: Expected: "+0,000,000,000,000,000E-398"
Result: "+5,000,000,000,000,000E-398"
in: ./tests/test-strtod.c:119.

Found 1 failures.

While working on PR #24, we noticed that a mistake should have caused the testsuite to failure but it didn't.
I could mean that:

• Our tests aren't coverying that kind of error (replace __builtin_clz() by __builtin_ctz()).
• Our tests generated the error, but GNU Make didn't catch it.
• Or we don't have tests for exception handling.

This is used in place of __int128 arithmetic which is nominally available on any recent 64b GCC compiler.

GCC converts between BID <-> DPD <-> Decnumber. I am unsure which approach is better today. Denumber uses declets internally.

This value exceeds the log table lookup and suffers from undefined behavior.

I get this:

../sysdeps/s390/dfpu/fe_decround.c: Assembler messages:
../sysdeps/s390/dfpu/fe_decround.c:56: Error: Unrecognized opcode: `srnmt'
make: *** [fe_decround.o] Error 1

This happens with binutils 2.28-8.el7 (from devtoolset-7-binutils-2.28-8.el7.s390x) and gcc 7.2.1 (from devtoolset-7-gcc-7.2.1-1.el7.s390x).

At least some libdfp conversions between decimal and binary types wrongly always produce an infinity for obviously overflowing results, without taking account of the rounding mode (the relevant rounding mode is that for the radix of the target type, not the source type). For example, the attached test converting 1e1000DL to double produces (on POWER8 little-endian):

inf

but the expected result, as with the libgcc conversions, is:

0x1.fffffffffffffp+1023
overflow.txt

At least some libdfp conversions between decimal and binary types wrongly clear the "inexact" exception when it was raised before the conversion; the exception flag bits are sticky and should not be cleared except by a few functions such as feclearexcept. For example, the attached test prints

inexact wrongly cleared

instead of the expected

inexact still raised as expected

that it does with the libgcc conversions.
testinex2.txt

It would be nice to extend support for TS 18661-2.

This will require fixing up the headers to honor new feature tests, and implement new API. I see the following API which is missing:

nextdowndN
nextupdN
canonicalizedN
fmaxmagdN
fminmagdN
totalordermagdN
totalorderdN
ufromfpdN
fromfpdN
fromfpxdN
ufromfpxdN
setpayloadsigdN
setpayloaddN
getpayloaddN
encodedecdN
decodedecdN
encodebindN
decodebindN

Where N is 32, 64, and 128.

And narrowing functions where sizeof(M) < sizeof(N):
dMadddN
dMsubdN
dMmuldN
dMdivdN
dMfmadN
dMsqrtdN

Likewise, missing are the stdlib string functions:
strfromdN

An user reported the following suspicious output for log().
Reproduced on power8.

Output:
2../test-log-d64
...
Test: log (2.718281828459045235360287471352662)
Result:
is: 9.99999999999999900000e-01 9.9999999999999990e-01
should be: 1.00000000000000000000e+00 1.0000000000000000e+00
difference: 1.00000000000000000000e-16 1.0000000000000000e-16
ulp : 0.1000
max.ulp : 0.0000
...

3../test-log-d128
...
Test: log (2.718281828459045235360287471352662)
Result:
is: 1.00000000000000000000e+00
9.9999999999999999999999999999999980e-01
should be: 1.00000000000000000000e+00
1.0000000000000000000000000000000000e+00
difference: -2.00000000000000000000e-34
-2.0000000000000000000000000000000000e-34
ulp : -0.2000
max.ulp : 0.0000
...

At least some libdfp conversions between decimal and binary types wrongly always produce a zero for obvious underflowing results, without taking account of the rounding mode (the relevant rounding mode is that for the radix of the target type, not the source type). For example, the attached test converting 1e-1000DL to double produces (on POWER8 little-endian):

0x0p+0

but the expected result, as with the libgcc conversions, is:

0x0.0000000000001p-1022
underflow.txt

When configuring libdfp on s390x with z10 CPU setting, the package fails to build from source:

$ make
find: ‘./sysdeps/s390/dfpu/libdfp-test-ulps’: No such file or directory
find: ‘./sysdeps/s390/fpu/libdfp-test-ulps’: No such file or directory
find: ‘./sysdeps/s390/libdfp-test-ulps’: No such file or directory
find: ‘./sysdeps/dpd/libdfp-test-ulps’: No such file or directory
VPATH=./sysdeps/s390/dfpu:./sysdeps/s390/fpu:./sysdeps/s390:./sysdeps/dpd:./sysdeps/generic:./decNumberMath/:./ieee754r/:./base-math:./:./tests
Processing Makefiles: ./sysdeps/dpd/ ./decNumberMath/ ./ieee754r/ ./base-math
gcc  -DSHARED -O2 -fpic -g -march=z10  -mzarch -MT floattitd.o -MD -MP -MF floattitd.d -c ./base-math/floattitd.c -D__STDC_DEC_FP__=200704L -D__STDC_WANT_DEC_FP__=1 -DOPTION_EGLIBC_LOCALE_CODE=1 -std=gnu99 -D_ISOC99_SOURCE -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute -Wno-long-long -include ./config.h -include ./include/libdfp-symbols.h  -I./include  -I./dfp  -I./dfp/decimal  -I./libdecnumber/dpd  -I./libdecnumber  -I./sysdeps/s390/dfpu  -I./sysdeps/s390/fpu  -I./sysdeps/s390  -I./sysdeps/dpd  -I./sysdeps/generic  -I./decNumberMath/  -I./ieee754/  -I./base-math/  -I.  -I. -o floattitd.o
./base-math/floattitd.c:27:29: fatal error: convert_helpers.h: No such file or directory
compilation terminated.
Makefile:241: recipe for target 'floattitd.o' failed
make: *** [floattitd.o] Error 1

The following error happens on Ubuntu 14.04.4 ppc64el during "make check":

LC_ALL=C mawk -f scripts/localplt.awk libdfp.so.jmprel |
LC_ALL=C mawk -f scripts/check-localplt.awk ./sysdeps/generic/localplt.data -
> check-localplt.out
mawk: scripts/localplt.awk: line 76: regular expression compile failed (bad class -- [], [^] or [)
([^ mawk: scripts/localplt.awk: line 76: syntax error at or n]
mawk: scripts/localplt.awk: line 76: runaway regular expression /, "\1:", ...
make: *** [check-localplt.out] Error 1

Ubuntu 14.04.4 has mawk-1.3.3-17ubuntu2 as its AWK interpreter. Perhaps ./configure should look for gawk instead. Or update awk scripts to make them compatible with both mawk and gawk.

test-log-d64:
Test: log (2.718281828459045235360287471352662)
Result:
is: 9.99999999999999900000e-01 9.999999999999999e-01
should be: 1.00000000000000000000e+00 1.000000000000000e+00
difference: 1.00000000000000000000e-16 1.000000000000000e-16
ulp : 0.1000
max.ulp : 0.0000

test-log-d128:
Test: log (2.718281828459045235360287471352662)
Result:
is: 1.00000000000000000000e+00 9.999999999999999999999999999999998e-01
should be: 1.00000000000000000000e+00 1.000000000000000000000000000000000e+00
difference: 2.00000000000000000000e-34 2.000000000000000000000000000000000e-34
ulp : 0.2000
max.ulp : 0.0000

At least some libdfp conversions between decimal and binary types wrongly fail to raise the "inexact" exception for inexact results. For example, the attached test prints

inexact not raised

instead of the expected

inexact raised as expected

(libgcc conversions via strings have the same issue because glibc strtod fails to raise "inexact", which is a strtod bug; this bug report is only about the libdfp issue).
testinex.txt

Newer distributions provide only python3 by default.
Some are even considering to drop support for python, aka. python 2

src/libdfp/tests/gen-libdfp-tests.py -t decimal32 src/libdfp/tests/fpclassify.input > ./test-fpclassify-d32.c
/usr/bin/env: ‘python’: No such file or directory
make: *** [Makefile:419: test-fpclassify-d32.c] Error 127
...

There are 2 problems here:

1. The configure is not checking if python is available;
2. libdfp should start to require python3.

It return -INF for tiny values. Likewise, it does not respect subnormal resultants.

The following output has been reported by an user.
It looks like quantize() is giving better results than the test expects.
Reproduced on power8.

Output:
6../test-quantize-d32
...
Test: quantize (-0.1, 1.0)
Result:
is: -1.00000000000000000000e-01 -1.00000000e-01
should be: -0.00000000000000000000e+00 -0.00000000e+00
difference: 1.00000000000000000000e-01 1.00000000e-01
ulp : -0.0000
max.ulp : 0.0000

7../test-quantize-d64
...
Test: quantize (-0.1, 1.0)
Result:
is: -1.00000000000000000000e-01 -1.0000000000000000e-01
should be: -0.00000000000000000000e+00 -0.0000000000000000e+00
difference: 1.00000000000000000000e-01 1.0000000000000000e-01
ulp : -0.0000
max.ulp : 0.0000
...

8../test-quantize-d128
...
Test: quantize (-0.1, 1.0)
Result:
is: -1.00000000000000000000e-01
-1.0000000000000000000000000000000000e-01
should be: -0.00000000000000000000e+00
-0.0000000000000000000000000000000000e+00
difference: -1.00000000000000000000e-01
-1.0000000000000000000000000000000000e-01
ulp : 0.0000
max.ulp : 0.0000
...

IEEE 754, TR 24732 and TS 18661-2 all specify that conversions between binary and decimal floating point types, in either direction, must be correctly rounded. The libdfp conversions, however, are not. The appended test illustrates this for conversions from _Decimal128 to double and I expect other conversions are similarly affected. Testing on POWER8 little-endian, I get

334 passes, 309 fails

but the expected output (as obtained when using libgcc conversions via strings instead of linking with libdfp) is:

643 passes, 0 fails

include <stdio.h>

struct test { _Decimal128 a; double b; };

static volatile struct test tests[] =
{
{ 4014726507494508544159874225545523e-340DL, 0x4.82c2685cb4194p-1020 },
{ 8029453014989017088319748451091046e-340DL, 0x9.0584d0b968328p-1020 },
{ 1801855589287419980815050884769007e-339DL, 0x1.43eb187aeb785p-1016 },
{ 3626954367709046642494879218191221e-338DL, 0x1.97826a5cad2eep-1012 },
{ 7253908735418093284989758436382442e-338DL, 0x3.2f04d4b95a5dcp-1012 },
{ 2997221668398624927484976226963055e-337DL, 0xd.278d921a15c3p-1012 },
{ 3836865267479187214164846881933943e-337DL, 0x1.0d6f10420533p-1008 },
{ 7673730534958374428329693763867886e-337DL, 0x2.1ade20840a66p-1008 },
{ 2397777334718899941987980981570444e-336DL, 0x6.93c6c90d0ae18p-1008 },
{ 4795554669437799883975961963140888e-336DL, 0xd.278d921a15c3p-1008 },
{ 2005030828862579227603481781841521e-334DL, 0x2.25fe0d8ff5396p-1000 },
{ 2023572319008330520523588116333811e-333DL, 0x1.5aec8ce93ef3dp-996 },
{ 7668808343268414529919115747437117e-332DL, 0x3.35b82b8f44bb2p-992 },
{ 5234588283611777491556375980799011e-331DL, 0x1.5e8e809e4cbcap-988 },
{ 2419076792921427162743484725591410e-327DL, 0x1.8b84680cf407dp-976 },
{ 1795988825255558335952383258022639e-326DL, 0xb.786d947798588p-976 },
{ 1935261434337141730194787780473128e-326DL, 0xc.5c234067a03e8p-976 },
{ 8264459614736573503220738093670883e-325DL, 0x2.0fd348faeefc8p-968 },
{ 2664216569453690704547178424124874e-324DL, 0x6.a58d611fc76cp-968 },
{ 5328433138907381409094356848249748e-324DL, 0xd.4b1ac23f8ed8p-968 },
{ 2348821180663353675301104996336908e-323DL, 0x3.a9930bc6e382cp-964 },
{ 3829910063302400414264356800994987e-322DL, 0x3.bb7c71c189d3p-960 },
{ 7659820126604800828528713601989974e-322DL, 0x7.76f8e38313a6p-960 },
{ 7125233393417469262032603092905331e-321DL, 0x4.57008f783e258p-956 },
{ 3384895396565646269970708954532749e-316DL, 0x3.2557eda80c678p-940 },
{ 6769790793131292539941417909065498e-316DL, 0x6.4aafdb5018cfp-940 },
{ 8710632748372721592328745984745725e-316DL, 0x8.1875123182ce8p-940 },
{ 1742126549674544318465749196949145e-315DL, 0x1.030ea2463059dp-936 },
{ 3484253099349088636931498393898290e-315DL, 0x2.061d448c60b3ap-936 },
{ 6968506198698177273862996787796580e-315DL, 0x4.0c3a8918c1674p-936 },
{ 1393701239739635454772599357559316e-314DL, 0x8.1875123182ce8p-936 },
{ 2787402479479270909545198715118632e-314DL, 0x1.030ea2463059dp-932 },
{ 5574804958958541819090397430237264e-314DL, 0x2.061d448c60b3ap-932 },
{ 1413303440219179696432602524788250e-313DL, 0x5.2180fa5d53108p-932 },
{ 2080750759369681061328897452724507e-313DL, 0x7.8dd1d98f39f98p-932 },
{ 4161501518739362122657794905449014e-313DL, 0xf.1ba3b31e73f3p-932 },
{ 8323003037478724245315589810898028e-313DL, 0x1.e3747663ce7e6p-928 },
{ 2589539997848585752044634361648277e-311DL, 0x3.ac1c1c311253ep-924 },
{ 5179079995697171504089268723296554e-311DL, 0x7.5838386224a7cp-924 },
{ 5959591590065207244700171853215871e-311DL, 0x8.7393d7648d73p-924 },
{ 1447222722784440009146984985383168e-310DL, 0x1.48603e9754c42p-920 },
{ 7406814312849647253847156838599039e-310DL, 0x6.909ca5362d2c4p-920 },
{ 2853518468597507436108987680415987e-307DL, 0x9.e1298c2294ccp-912 },
{ 5707036937195014872217975360831974e-307DL, 0x1.3c25318452998p-908 },
{ 9426139287561980126090399910121765e-307DL, 0x2.0a2ae4b5eb6cp-908 },
{ 1885227857512396025218079982024353e-306DL, 0x4.1455c96bd6d8p-908 },
{ 3770455715024792050436159964048706e-306DL, 0x8.28ab92d7adbp-908 },
{ 7540911430049584100872319928097412e-306DL, 0x1.0515725af5b6p-904 },
{ 7217273357791244764254988763041813e-304DL, 0x6.19bde2aa34a1p-900 },
{ 3584489410015040735915958931376773e-303DL, 0x1.e4c74e1158d7ep-896 },
{ 7210927727862056864094912336651545e-299DL, 0x9.4ceefd41ea8p-884 },
{ 1442185545572411372818982467330309e-298DL, 0x1.299ddfa83d5p-880 },
{ 2884371091144822745637964934660618e-298DL, 0x2.533bbf507aap-880 },
{ 5768742182289645491275929869321236e-298DL, 0x4.a6777ea0f54p-880 },
{ 2776084320673306121979232472416587e-297DL, 0x1.660de2a221f7fp-876 },
{ 6713791420121766560843213227883065e-296DL, 0x2.1d3530e7840fp-872 },
{ 1342758284024353312168642645576613e-295DL, 0x4.3a6a61cf081ep-872 },
{ 2685516568048706624337285291153226e-295DL, 0x8.74d4c39e103cp-872 },
{ 5371033136097413248674570582306452e-295DL, 0x1.0e9a9873c2078p-868 },
{ 4447246719681592730327429560921427e-294DL, 0x8.c09daf89e6a78p-868 },
{ 8894493439363185460654859121842854e-294DL, 0x1.1813b5f13cd4fp-864 },
{ 5186275852814249145005142378029447e-293DL, 0x6.6118b03406fa8p-864 },
{ 8142392385344874803715993646461527e-293DL, 0xa.03f13a2b6242p-864 },
{ 1811074237375074197170310868707553e-291DL, 0xd.ec49195adf28p-860 },
{ 8606362649681462655172534016529307e-290DL, 0x2.95a18ffba21b2p-852 },
{ 8917691952580014853227686140346243e-289DL, 0x1.ac7a6cd979c76p-848 },
{ 1245317211594208792220608495267744e-288DL, 0x2.5659f2683280ap-848 },
{ 1285411505878319453757293829962151e-288DL, 0x2.699dabefac282p-848 },
{ 7000848977937822223513684551512273e-286DL, 0x5.21f98bb3e7104p-840 },
{ 1483360089606007093066750353536840e-285DL, 0xa.e0167418651e8p-840 },
{ 4424653257383702631271313480814723e-278DL, 0x1.355e431f2958fp-812 },
{ 8849306514767405262542626961629446e-278DL, 0x2.6abc863e52b1ep-812 },
{ 2390484840495475712026948715648297e-277DL, 0x6.8768691098ebcp-812 },
{ 4780969680990951424053897431296594e-277DL, 0xd.0ed0d22131d78p-812 },
{ 9561939361981902848107794862593188e-277DL, 0x1.a1da1a44263afp-808 },
{ 9897509760638098473400151025530099e-276DL, 0x1.0e52987112c53p-804 },
{ 3053327227827445695615569926504135e-275DL, 0x3.41ee31b181962p-804 },
{ 3422091266405326388892290549512982e-275DL, 0x3.a6a5e15c9d0fp-804 },
{ 6475418494232772084507860476017117e-275DL, 0x6.e894130e1ea54p-804 },
{ 2442661782261956556492455941203308e-274DL, 0x1.a0f718d8c0cb1p-800 },
{ 4885323564523913112984911882406616e-274DL, 0x3.41ee31b181962p-800 },
{ 5254087603101793806261632505415463e-274DL, 0x3.80e0ff7c72c1ap-800 },
{ 2249140656671869799815341251369724e-273DL, 0xe.ff4f351d8fb5p-800 },
{ 4431839790669080589006341880801007e-272DL, 0x1.278406058e75cp-792 },
{ 8863679581338161178012683761602014e-272DL, 0x2.4f080c0b1ceb8p-792 },
{ 1691671823511138968916189125055305e-271DL, 0x4.68025bd0a8afp-792 },
{ 1353337458808911175132951300044244e-270DL, 0x2.34012de854578p-788 },
{ 2706674917617822350265902600088488e-270DL, 0x4.68025bd0a8afp-788 },
{ 3067337982013462990598640528871025e-270DL, 0x4.fe50dcea83474p-788 },
{ 5774012899631285340864543128959513e-270DL, 0x9.665338bb2bf6p-788 },
{ 6134675964026925981197281057742050e-270DL, 0x9.fca1b9d5068e8p-788 },
{ 2093207321215129752146174494314283e-269DL, 0x2.21375dc519048p-784 },
{ 2453870385610770392478912423096820e-269DL, 0x2.7f286e7541a3ap-784 },
{ 4547077706825900144625086917411103e-269DL, 0x4.a05fcc3a5aa8p-784 },
{ 4907740771221540784957824846193640e-269DL, 0x4.fe50dcea83474p-784 },
{ 9454818478047440929582911763604743e-269DL, 0x9.9eb0a924ddefp-784 },
{ 9815481542443081569915649692387280e-269DL, 0x9.fca1b9d5068e8p-784 },
{ 1602433244092975673650392009694919e-268DL, 0x1.04dd8ccc876e6p-780 },
{ 1963096308488616313983129938477456e-268DL, 0x1.3f94373aa0d1dp-780 },
{ 3565529552581591987633521948172375e-268DL, 0x2.4471c40728402p-780 },
{ 3926192616977232627966259876954912e-268DL, 0x2.7f286e7541a3ap-780 },
{ 7852385233954465255932519753909824e-268DL, 0x4.fe50dcea83474p-780 },
{ 1426211821032636795053408779268950e-267DL, 0x9.11c7101ca1008p-780 },
{ 2852423642065273590106817558537900e-267DL, 0x1.2238e20394201p-776 },
{ 1140969456826109436042727023415160e-266DL, 0x4.88e3880e50804p-776 },
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{ 1785456712009126191199771877618407e187DL, 0xc.a5129992f85d8p+728 },
{ 1932176707345588773213221604874848e194DL, 0x8.27ff79c5b5648p+752 },
{ 3864353414691177546426443209749696e194DL, 0x1.04ffef38b6ac9p+756 },
{ 7126815900176748812465889893990095e194DL, 0x1.e158fa5711421p+756 },
{ 2438990234655827783933265230951677e195DL, 0x6.6f4d638900394p+756 },
{ 2850726360070699524986355957596038e195DL, 0x7.8563e95c45084p+756 },
{ 5701452720141399049972711915192076e195DL, 0xf.0ac7d2b88a108p+756 },
{ 4608056389736231635913718089037825e197DL, 0x4.bfbdb2243d7ap+764 },
{ 9216112779472463271827436178075650e197DL, 0x9.7f7b64487af4p+764 },
{ 1843222555894492654365487235615130e198DL, 0x1.2fef6c890f5e8p+768 },
{ 3686445111788985308730974471230260e198DL, 0x2.5fded9121ebdp+768 },
{ 7372890223577970617461948942460520e198DL, 0x4.bfbdb2243d7ap+768 },
{ 1474578044715594123492389788492104e199DL, 0x9.7f7b64487af4p+768 },
{ 2949156089431188246984779576984208e199DL, 0x1.2fef6c890f5e8p+772 },
{ 5375899823198473729279607747590385e199DL, 0x2.2a08124091696p+772 },
{ 5898312178862376493969559153968416e199DL, 0x2.5fded9121ebdp+772 },
{ 2150359929279389491711843099036154e200DL, 0x8.a820490245a58p+772 },
{ 4300719858558778983423686198072308e200DL, 0x1.1504092048b4bp+776 },
{ 4823132214222681748113637604450339e200DL, 0x1.36aa45634108fp+776 },
{ 1615805472290731040431484197953317e202DL, 0x2.8a7a4b7cff5a8p+780 },
{ 3659358894951772685171237075948255e204DL, 0x2.3f737811e9bb2p+788 },
{ 7318717789903545370342474151896510e204DL, 0x4.7ee6f023d3764p+788 },
{ 1463743557980709074068494830379302e205DL, 0x8.fdcde047a6ec8p+788 },
{ 2927487115961418148136989660758604e205DL, 0x1.1fb9bc08f4dd9p+792 },
{ 5854974231922836296273979321517208e205DL, 0x2.3f737811e9bb2p+792 },
{ 2982744096341530777676504924339277e206DL, 0xb.739068a967608p+792 },
{ 8727204367504141814871453718695139e206DL, 0x2.18174f8bcdb3ep+796 },
{ 1369738720683444530803879723751134e208DL, 0x2.0ddf943b6654p+800 },
{ 5731207658624860415845123685568637e209DL, 0x5.5f3639bc29264p+804 },
{ 7876968058300521640980718259403225e210DL, 0x4.9d4e6f9387d5p+808 },
{ 1575393611660104328196143651880645e211DL, 0x9.3a9cdf270faap+808 },
{ 3150787223320208656392287303761290e211DL, 0x1.27539be4e1f54p+812 },
{ 6301574446640417312784574607522580e211DL, 0x2.4ea737c9c3ea8p+812 },
{ 1260314889328083462556914921504516e212DL, 0x4.9d4e6f9387d5p+812 },
{ 2520629778656166925113829843009032e212DL, 0x9.3a9cdf270faap+812 },
{ 5041259557312333850227659686018064e212DL, 0x1.27539be4e1f54p+816 },
{ 2492546208236873264301832498864815e213DL, 0x5.b42e5c56b50dcp+816 },
{ 4191688440953846988252383956966981e213DL, 0x9.97922e12c9678p+816 },
{ 8383376881907693976504767913933962e213DL, 0x1.32f245c2592cfp+820 },
{ 1994036966589498611441465999091852e214DL, 0x2.da172e2b5a86ep+820 },
{ 2632970958121318147947796190576063e215DL, 0x2.5a847591daa8p+824 },
{ 5265941916242636295895592381152126e215DL, 0x4.b508eb23b55p+824 },
{ 7744442890375874439998437722449751e215DL, 0x6.ec343b47eb454p+824 },
{ 5446055617722808337222049746751399e219DL, 0xb.e29b099dbbad8p+836 },
{ 5259924817284655751866507307300383e221DL, 0x4.7be5cb7a74b94p+844 },
{ 2349053309602280518684653473479607e223DL, 0xc.840791ab33778p+848 },
{ 5534327143339863119611304957268887e224DL, 0x1.26de5b86e1345p+856 },
{ 2136701720686441678622876707893655e225DL, 0x4.726eea5814a44p+856 },
{ 1709361376549153342898301366314924e226DL, 0x2.3937752c0a522p+860 },
{ 3418722753098306685796602732629848e226DL, 0x4.726eea5814a44p+860 },
{ 5541359586821491534547363118353759e227DL, 0x4.814b45afbc1fcp+864 },
{ 2698720294183948157326034287647753e230DL, 0x8.920676bf7323p+872 },
{ 5397440588367896314652068575295506e230DL, 0x1.1240ced7ee646p+876 },
{ 3508107768572455110438575298714495e233DL, 0x2.b84cef6d08334p+884 },
{ 7016215537144910220877150597428990e233DL, 0x5.7099deda10668p+884 },
{ 1403243107428982044175430119485798e234DL, 0xa.e133bdb420cdp+884 },
{ 2806486214857964088350860238971596e234DL, 0x1.5c2677b68419ap+888 },
{ 5612972429715928176701720477943192e234DL, 0x2.b84cef6d08334p+888 },
{ 8863103403928930579965819103278029e234DL, 0x4.4b7c5e908bebcp+888 },
{ 3459983233510030189776594282137575e237DL, 0x6.8ca1e2807f854p+896 },
{ 6919966467020060379553188564275150e237DL, 0xd.1943c500ff0a8p+896 },
{ 2767986586808024151821275425710060e238DL, 0x3.4650f1403fc2ap+900 },
{ 5535973173616048303642550851420120e238DL, 0x6.8ca1e2807f854p+900 },
{ 2214389269446419321457020340568048e239DL, 0x1.a32878a01fe15p+904 },
{ 4428778538892838642914040681136096e239DL, 0x3.4650f1403fc2ap+904 },
{ 8857557077785677285828081362272192e239DL, 0x6.8ca1e2807f854p+904 },
{ 3494239048066394893903444077535573e241DL, 0x1.025ddfd33af2fp+912 },
{ 6409754124892808115145571131361333e243DL, 0xb.92235cef2e06p+916 },
{ 3451550133931603602532745892766899e245DL, 0x2.6f126750ed3ecp+924 },
{ 6030401158520284971123070527108695e245DL, 0x4.409ac8bd9175p+924 },
{ 1206080231704056994224614105421739e246DL, 0x8.8135917b22eap+924 },
{ 2412160463408113988449228210843478e246DL, 0x1.1026b22f645d4p+928 },
{ 4824320926816227976898456421686956e246DL, 0x2.204d645ec8ba8p+928 },
{ 9648641853632455953796912843373912e246DL, 0x4.409ac8bd9175p+928 },
{ 3177167469331289395921348296037741e250DL, 0x3.6b274077da574p+940 },
{ 1748659638942498001891311945695003e251DL, 0x1.2d0b26e8d554p+944 },
{ 3497319277884996003782623891390006e251DL, 0x2.5a164dd1aaa8p+944 },
{ 3564415465455574916592766971280586e253DL, 0xe.fb3d193adc38p+948 },
{ 1354413040542463235536259769288698e255DL, 0x2.394417d2b93cep+956 },
{ 2708826081084926471072519538577396e255DL, 0x4.72882fa57279cp+956 },
{ 5417652162169852942145039077154792e255DL, 0x8.e5105f4ae4f38p+956 },
{ 3123867977918010008111079143185849e256DL, 0x3.349c283cd224cp+960 },
{ 1932910926307651756903856324082353e261DL, 0x3.06c699cbd5f6p+976 },
{ 3865821852615303513807712648164706e261DL, 0x6.0d8d3397abecp+976 },
{ 4810955983684551456760555007841915e261DL, 0x7.8864a5a9195bcp+976 },
{ 8676777836299854970568267656006621e261DL, 0xd.95f1d940c5478p+976 },
{ 9621911967369102913521110015683830e261DL, 0xf.10c94b5232b78p+976 },
{ 1924382393473820582704222003136766e262DL, 0x1.e219296a4656fp+980 },
{ 3848764786947641165408444006273532e262DL, 0x3.c43252d48cadep+980 },
{ 7697529573895282330816888012547064e262DL, 0x7.8864a5a9195bcp+980 },
{ 4793898918016889108361286365950741e263DL, 0x2.ee9b9c53a6ac4p+984 },
{ 2241835533203522791040487963097706e264DL, 0xd.b62b2b3659aap+984 },
{ 2957408342309325251940765173749797e264DL, 0x1.21694d86fd7c8p+988 },
{ 5914816684618650503881530347499594e264DL, 0x2.42d29b0dfaf9p+988 },
{ 7441079408716370834021741099945209e265DL, 0x1.c71d2fd49d6f1p+992 },
{ 1999623620064007322318961558412890e266DL, 0x4.c7045fd33ed94p+992 },
{ 3999247240128014644637923116825780e266DL, 0x9.8e08bfa67db28p+992 },
{ 4220445609374187247590610939575827e266DL, 0xa.1553071be2e18p+992 },
{ 8440891218748374495181221879151654e266DL, 0x1.42aa60e37c5c3p+996 },
{ 1599698896051205857855169246730312e267DL, 0x2.63822fe99f6cap+996 },
{ 5020295057399790176518195562940983e267DL, 0x7.7f14fc663d838p+996 },
{ 5979214855736472734666335816634517e271DL, 0x1.5cc2f0671954ep+1012 },
{ 2140001790348707494076958326069627e273DL, 0x3.0c2694d9ac2eep+1016 },
{ 2893681248568924501714561685613969e273DL, 0x4.1ee8be47d2bbcp+1016 },
{ 4280003580697414988153916652139254e273DL, 0x6.184d29b3585dcp+1016 },
{ 6619155896414943295292736351143109e274DL, 0x5.e428962219878p+1020 },
};

int
main (void)
{
int i;
int passes = 0, fails = 0;
for (i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
{
double d = (double) tests[i].a;
if (d == tests[i].b)
passes++;
else
fails++;
}
printf ("%d passes, %d fails\n", passes, fails);
return fails > 0;
}

Test: exp (88.72269439697265625)
Result:
is: 3.40231600000000000000e+38 3.4023160e+38
should be: 3.40233100000000000000e+38 3.4023310e+38

Not sure if this is a bug of the test suit. would anyone please have a look at it ?

While trying to build libdfp on cross with AT, the libdfp.so.1 is not created and no error message is displayed.
This is the log:

+Linking shared object files into libdfp-1.0.9.so.
/home/rzinsly/AT/eight/at-next-8.0/bin/powerpc64-linux-gnu-gcc -DSHARED -O3 -Wl,-zrelro -fpic -g -m64 -mcpu=power7 -shared -Wl,-soname,libdfp.so.1 -Bsymbolic -Wl,--whole-archive libdecnumber/libdecnumber.a -Wl,--no-whole-archive -Wl,--version-script,libdfp.map dfptypeconv.os mapround.os decode.os fmt_d32.os fmt_d64.os fmt_d128.os fe_decround.os strtod32.os strtod64.os strtod128.os wcstod32.os wcstod64.os wcstod128.os printf_dfp.os init_dfp.os dpd-private.os binpowof10.os decpowof2.os decNumberMath.os acosd32.os acosd64.os acosd128.os acoshd32.os acoshd64.os acoshd128.os asind32.os asind64.os asind128.os asinhd32.os asinhd64.os asinhd128.os atan2d32.os atan2d64.os atan2d128.os atand32.os atand64.os atand128.os atanhd32.os atanhd64.os atanhd128.os cbrtd32.os cbrtd64.os cbrtd128.os ceild32.os ceild64.os ceild128.os copysignd32.os copysignd64.os copysignd128.os cosd32.os cosd64.os cosd128.os coshd32.os coshd64.os coshd128.os erfd32.os erfd64.os erfd128.os exp2d32.os exp2d64.os exp2d128.os expd32.os expd64.os expd128.os expm1d32.os expm1d64.os expm1d128.os fabsd32.os fabsd64.os fabsd128.os fdimd32.os fdimd64.os fdimd128.os isfinited32.os isfinited64.os isfinited128.os issignalingd32.os issignalingd64.os issignalingd128.os floord32.os floord64.os floord128.os fmad32.os fmad64.os fmad128.os fmaxd32.os fmaxd64.os fmaxd128.os fmind32.os fmind64.os fmind128.os fmodd32.os fmodd64.os fmodd128.os fpclassifyd32.os fpclassifyd64.os fpclassifyd128.os frexpd32.os frexpd64.os frexpd128.os hypotd32.os hypotd64.os hypotd128.os ilogbd32.os ilogbd64.os ilogbd128.os llogbd32.os llogbd64.os llogbd128.os isgreaterd32.os isgreaterd64.os isgreaterd128.os isgreaterequald32.os isgreaterequald64.os isgreaterequald128.os isinfd32.os isinfd64.os isinfd128.os islessd32.os islessd64.os islessd128.os islessequald32.os islessequald64.os islessequald128.os islessgreaterd32.os islessgreaterd64.os islessgreaterd128.os isnand32.os isnand64.os isnand128.os isnormald32.os isnormald64.os isnormald128.os isunorderedd32.os isunorderedd64.os isunorderedd128.os ldexpd32.os ldexpd64.os ldexpd128.os lgammad32.os lgammad64.os lgammad128.os llquantexpd32.os llquantexpd64.os llquantexpd128.os llrintd32.os llrintd64.os llrintd128.os llroundd32.os llroundd64.os llroundd128.os log10d32.os log10d64.os log10d128.os log1pd32.os log1pd64.os log1pd128.os log2d32.os log2d64.os log2d128.os logbd32.os logbd64.os logbd128.os logd32.os logd64.os logd128.os lrintd32.os lrintd64.os lrintd128.os lroundd32.os lroundd64.os lroundd128.os modfd32.os modfd64.os modfd128.os nand32.os nand64.os nand128.os nearbyintd32.os nearbyintd64.os nearbyintd128.os nextafterd32.os nextafterd64.os nextafterd128.os nexttowardd32.os nexttowardd64.os nexttowardd128.os powd32.os powd64.os powd128.os quantized32.os quantized64.os quantized128.os quantumd32.os quantumd64.os quantumd128.os remainderd32.os remainderd64.os remainderd128.os rintd32.os rintd64.os rintd128.os roundd32.os roundd64.os roundd128.os roundevend32.os roundevend64.os roundevend128.os samequantumd32.os samequantumd64.os samequantumd128.os scalblnd32.os scalblnd64.os scalblnd128.os scalbnd32.os scalbnd64.os scalbnd128.os signbitd32.os signbitd64.os signbitd128.os sind32.os sind64.os sind128.os sinhd32.os sinhd64.os sinhd128.os sqrtd32.os sqrtd64.os sqrtd128.os tand32.os tand64.os tand128.os tanhd32.os tanhd64.os tanhd128.os tgammad32.os tgammad64.os tgammad128.os truncd32.os truncd64.os truncd128.os addsd3.os adddd3.os addtd3.os divsd3.os divdd3.os divtd3.os eqsd2.os eqdd2.os eqtd2.os extendsddd2.os extendsdtd2.os extendddtd2.os extendsfsd.os extendsddf.os extendsdtf.os extendsfdd.os extenddfdd.os extendddtf.os extendsftd.os extenddftd.os extendtftd.os fixsdsi.os fixddsi.os fixtdsi.os fixsddi.os fixdddi.os fixtddi.os fixunssdsi.os fixunsddsi.os fixunstdsi.os fixunssddi.os fixunsdddi.os fixunstddi.os floatsisd.os floatsidd.os floatsitd.os floatdisd.os floatdidd.os floatditd.os floatunssisd.os floatunssidd.os floatunssitd.os floatunsdisd.os floatunsdidd.os floatunsditd.os gesd2.os gedd2.os getd2.os gtsd2.os gtdd2.os gttd2.os lesd2.os ledd2.os letd2.os ltsd2.os ltdd2.os lttd2.os mulsd3.os muldd3.os multd3.os nesd2.os nedd2.os netd2.os subsd3.os subdd3.os subtd3.os truncddsd2.os trunctddd2.os trunctdsd2.os truncsdsf.os truncdfsd.os trunctfsd.os truncddsf.os truncdddf.os trunctfdd.os trunctdsf.os trunctddf.os trunctdtf.os unordsd2.os unorddd2.os unordtd2.os classify.os -o libdfp-1.0.9.so -lm

+Creating linker .so symlink libdfp.so -> libdfp-1.0.9.so
ln -f -s libdfp-1.0.9.so libdfp.so

+Running ldconfig to create the library compat symlink libdfp.so.1 -> libdfp-1.0.9.so
/sbin/ldconfig -l libdfp-1.0.9.so
/sbin/ldconfig: No link created since soname could not be found for libdfp-1.0.9.so

libdfp was configured with:
CFLAGS='-Wl,-zrelro -g -O3 -m64' CXXFLAGS='-g -O3 -m64' ./configure --build=x86_64-pc-linux-gnu --host=powerpc64-linux-gnu --with-backend=libdecnumber --enable-decimal-float=dpd --with-cpu=power7

The commit beeb238 was tested with the changes in: a42c6fb applied.

Printf statements that uses %f and %Hf didn't work, the values printed will be zero instead of the real values of the variables in %f and %Hf.

For example, this: printf("%f (long double) %Hf (_Decimal64)\n", number, dd)
Will generate this output: 0.000000 (long double) 0.000000 (_Decimal64)

From libdfp side, for a value with 32 bits the function __d32_va (./printf_dfp.c:300) is called with the wrong parameter va_list *ap when this combination occurs, so the function stores the wrong value (something like 0E-101), maybe this is caused by some bug in glibc side.

When %f and %Hf is used together ___printf_fp is called earlier in _IO_vfprintf_internal than other hook combinations that I observed, maybe this could indicate what is wrong.

Exponent check must be not use exp from getmantandexpd*. That's because those function returns the nromalized exponent which is adjusted later in the code. Some exception (underflow/overflow) code is using this exponent which may lead on wrong results:

1.797693134862316e308DD the result 1797693134862316e309 and exp is 309. I the case of a conversion to a double 309 is beyond the maximum (base 10) exponent for a double which is 308. So, the expected result of this conversion will be something like 1.797680e+308 but, instead we get infinity since we are use the normalized exponent to check.

In order to fix the code must check the exponent (not normalized) for overflow/underflow. Also we may need to check the mantissa in order to see if the mantissa is not generate a overflow and overflow

The crontab file should have mode bits 644.
Having 664 may spam the syslog of some Linux distributions. Ubuntu 17.04 is known to be affected by this.

On s390x (with hardware dfp) the test test-cast-to-overflow fails with:
3 Error: Expected: "0x1.fffffffffffffp+1023"
Result: "inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:49

4 Error: Expected: "-0x1.fffffffffffffp+1023"
Result: "-inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:50

5 Error: Expected: "0x1.fffffffffffffp+1023"
Result: "inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:51

8 Error: Expected: "-0x1.fffffffffffffp+1023"
Result: "-inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:54

11 Error: Expected: "0x1.fffffep+127"
Result: "inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:61

12 Error: Expected: "-0x1.fffffep+127"
Result: "-inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:62

13 Error: Expected: "0x1.fffffep+127"
Result: "inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:63

16 Error: Expected: "-0x1.fffffep+127"
Result: "-inf"
in: /home/stli/libdfpDir/src/tests/test-cast-to-overflow.c:66

Found 8 failures.

and test-cast-to-underflow with:
5 Error: Expected: "0x0.0000000000001p-1022"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:51

6 Error: Expected: "-0x0.0000000000001p-1022"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:52

10 Error: Expected: "-0x0.0000000000001p-1022"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:56

11 Error: Expected: "0x0.0000000000001p-1022"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:57

17 Error: Expected: "0x1p-149"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:67

18 Error: Expected: "-0x1p-149"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:68

22 Error: Expected: "-0x1p-149"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:72

23 Error: Expected: "0x1p-149"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:73

Found 8 failures.

The main cause of those fails on s390x is, that the pfpo instruction is used to convert from dfp to bfp values, but unfortunately, GCC emits the pfpo instruction with RM-mode 0 = "According to current DFP rounding mode in bits 25-27 of the floating-point-control register".
Future GCCs (>8.1) have to use RM-mode 1 = "According to current BFP rounding mode in bits 29-31 of the floating-point-control register"

After patching the test-binary in order to use RM-mode 1 or by adding fe_dec_setround() calls, the most tests are passing on s390x.

But there are still the following fails in test-cast-to-underflow:
5 Error: Expected: "0x0.0000000000001p-1022"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:51
// {LINE, FE_TONEAREST, 2.4703282292062326e-325DL, DBL_DENORM_MIN},

6 Error: Expected: "-0x0.0000000000001p-1022"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:52
// {LINE, FE_TONEAREST, -2.4703282292062326e-325DL, -DBL_DENORM_MIN},

17 Error: Expected: "0x1p-149"
Result: "0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:67
// {LINE, FE_TONEAREST, 7.0064922e-46DL, FLT_DENORM_MIN},

18 Error: Expected: "-0x1p-149"
Result: "-0x0p+0"
in: /home/stli/libdfpDir/src/tests/test-cast-to-underflow.c:68
// {LINE, FE_TONEAREST, -7.0064922e-46DL, -FLT_DENORM_MIN},

It seems as the tests use incorrect input values or assumptions.

According to the comment from Joseph Myers in "Conversions incorrect on underflow #32" (#32), "This fix looks wrong for FE_TONEAREST mode, when conversion of a value with absolute value less than or equal to half the least subnormal in the target type should produce +/- 0, not +/- the least subnormal."

The following min-values are defined for the bfp types:

define __FLT_DENORM_MIN__ 1.40129846432481707092372958328991613e-45F
define __DBL_DENORM_MIN__ ((double)4.94065645841246544176568792868221372e-324L)
define __LDBL_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966L

=> half of the least subnormal (DBL_DENORM_MIN) = 2.4703282292062327e-324.
And not 2.4...26e-325.
=> half of the least subnormal (FLT_DENORM_MIN) = 7.0064923e-46
And not 7.0...22e-46.

Thus the tests should be adjusted in order to use the correct input values and assumptions.

Furthermore, there seems to be a typo in some/all the truncation conversions.
See commit "Fix subnormals for decimal to binary conversions." (4f67ffa):
-In commit-message: "It should return -0.0/0.0 if the absolute value of the result is less than or equal to half the least subnormal or subnormal otherwise (task #32)."
-In code:

if (... || (exp == ... && (mant >= (POWOF10_MIN_DENORM_DBL_MAN/2LL))))
   return SIGNBIT(a) ? -0.0 : 0.0;
else
   return SIGNBIT(a) ? -__DBL_DENORM_MIN__ : __DBL_DENORM_MIN__;

@racardoso Can you have a look at your commit?

Reproduced this on Ubuntu 14.04 ppc64le:

/home/tuliom/src/libdfp/tests/test-amort.c: In function ‘main’:
/home/tuliom/src/libdfp/tests/test-amort.c:327:9: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread (inputs, sizeof (inputtype), numinputs, inputfile);
         ^

lrint.c and similar are rightfully generating warnings about integer overflow for several tests when built for ppc32 or i386. This was introduced by my large chunk of patches to cleanup the build system.

Running 'configure' on libdfp does not substitute the value of the variable 'cross_compilation' on Makefile.in