The gbsounddemo from zal0

Replace UINT16 by UINT8 for variables that have small values

There are lots of variables in this struct (most of them) that could be made 8-bit variables:

Lines 175 to 293 in 38082e2

    
           struct SoundReg { 
        
             struct { 
        
               //NR10 0xFF10  
        
               UINT16 sweepShifts     ;//: 3; 
        
               UINT16 sweepMode       ;//: 1; 
        
               UINT16 sweepTime       ;//: 3; 
        
               UINT16 unused_1        ;//: 1; 
        
               //NR11 0xFF11  
        
               UINT16 soundLength     ;//: 6; 
        
               UINT16 patternDuty     ;//: 2; 
        
               //NR12 0xFF12  
        
               UINT16 envNbSweep      ;//: 3; 
        
               UINT16 envMode         ;//: 1; 
        
               UINT16 envInitialValue ;//: 4; 
        
               //NR13 0xFF13  
        
               UINT16 frequencyLow; 
        
               //NR14 0xFF14  
        
               UINT16 frequencyHigh   ;//: 3; 
        
               UINT16 unused_2        ;//: 3; 
        
               UINT16 counter_ConsSel ;//: 1; 
        
               UINT16 restart         ;//: 1; 
        
             } mode1; 
        
             struct { 
        
               //NR20 0xFF15  
        
               UINT16 unused_1; 
        
               //NR21 0xFF16  
        
               UINT16 soundLength     ;//: 6; 
        
               UINT16 patternDuty     ;//: 2; 
        
               //NR22 0xFF17  
        
               UINT16 envNbStep       ;//: 3; 
        
               UINT16 envMode         ;//: 1; 
        
               UINT16 envInitialValue ;//: 4; 
        
               //NR23 0xFF18  
        
               UINT16 frequencyLow; 
        
               //NR24 0xFF19  
        
               UINT16 frequencyHigh   ;//: 3; 
        
               UINT16 unused_2        ;//: 3; 
        
               UINT16 counter_ConsSel ;//: 1; 
        
               UINT16 restart         ;//: 1; 
        
             } mode2; 
        
             struct { 
        
               //NR30 0xFF1A  
        
               UINT16 unused_1        ;//: 7; 
        
               UINT16 on_Off          ;//: 1; 
        
               //NR31 0xFF1B  
        
               UINT16 soundLength; 
        
               //NR32 0xFF1C  
        
               UINT16 unused_2        ;//: 5; 
        
               UINT16 selOutputLevel  ;//: 2; 
        
               UINT16 unused_3        ;//: 1; 
        
               //NR33 0xFF1D  
        
               UINT16 frequencyLow; 
        
               //NR34 0xFF1E  
        
               UINT16 frequencyHigh   ;//: 3; 
        
               UINT16 unused_4        ;//: 3; 
        
               UINT16 counter_ConsSel ;//: 1; 
        
               UINT16 restart         ;//: 1; 
        
             } mode3; 
        
             struct { 
        
               //NR40 0xFF1F  
        
               UINT16 unused_1; 
        
               //NR41 0xFF20  
        
               UINT16 soundLength     ;//: 6; 
        
               UINT16 unused_2        ;//: 2; 
        
               //NR42 0xFF21  
        
               UINT16 envNbStep       ;//: 3; 
        
               UINT16 envMode         ;//: 1; 
        
               UINT16 envInitialValue ;//: 4; 
        
               //NR43 0xFF22  
        
               UINT16 polyCounterDiv  ;//: 3; 
        
               UINT16 polyCounterStep ;//: 1; 
        
               UINT16 polyCounterFreq ;//: 4; 
        
               //NR44 0xFF23  
        
               UINT16 unused_3        ;//: 6; 
        
               UINT16 counter_ConsSel ;//: 1; 
        
               UINT16 restart         ;//: 1; 
        
             } mode4; 
        
             struct { 
        
               // NR50 0xFF24  
        
               UINT16 SO1_OutputLevel ;//: 3; 
        
               UINT16 Vin_SO1         ;//: 1; 
        
               UINT16 SO2_OutputLevel ;//: 3; 
        
               UINT16 Vin_SO2         ;//: 1; 
        
               // NR51 0xFF25  
        
               UINT16 Sound1_To_SO1   ;//: 1; 
        
               UINT16 Sound2_To_SO1   ;//: 1; 
        
               UINT16 Sound3_To_SO1   ;//: 1; 
        
               UINT16 Sound4_To_SO1   ;//: 1; 
        
               UINT16 Sound1_To_SO2   ;//: 1; 
        
               UINT16 Sound2_To_SO2   ;//: 1; 
        
               UINT16 Sound3_To_SO2   ;//: 1; 
        
               UINT16 Sound4_To_SO2   ;//: 1; 
        
               // NR52 0xFF26  
        
               UINT16 Sound1_On_Off   ;//: 1; 
        
               UINT16 Sound2_On_Off   ;//: 1; 
        
               UINT16 Sound3_On_Off   ;//: 1; 
        
               UINT16 Sound4_On_Off   ;//: 1; 
        
               UINT16 unused_1        ;//: 3; 
        
               UINT16 global_On_Off   ;//: 1; 
        
             } control; 
        
           };

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Replace UINT16 by UINT8 for variables that have small values

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	struct SoundReg {
	struct {
	//NR10 0xFF10
	UINT16 sweepShifts ;//: 3;
	UINT16 sweepMode ;//: 1;
	UINT16 sweepTime ;//: 3;
	UINT16 unused_1 ;//: 1;

	//NR11 0xFF11
	UINT16 soundLength ;//: 6;
	UINT16 patternDuty ;//: 2;

	//NR12 0xFF12
	UINT16 envNbSweep ;//: 3;
	UINT16 envMode ;//: 1;
	UINT16 envInitialValue ;//: 4;

	//NR13 0xFF13
	UINT16 frequencyLow;

	//NR14 0xFF14
	UINT16 frequencyHigh ;//: 3;
	UINT16 unused_2 ;//: 3;
	UINT16 counter_ConsSel ;//: 1;
	UINT16 restart ;//: 1;
	} mode1;
	struct {
	//NR20 0xFF15
	UINT16 unused_1;

	//NR21 0xFF16
	UINT16 soundLength ;//: 6;
	UINT16 patternDuty ;//: 2;

	//NR22 0xFF17
	UINT16 envNbStep ;//: 3;
	UINT16 envMode ;//: 1;
	UINT16 envInitialValue ;//: 4;

	//NR23 0xFF18
	UINT16 frequencyLow;

	//NR24 0xFF19
	UINT16 frequencyHigh ;//: 3;
	UINT16 unused_2 ;//: 3;
	UINT16 counter_ConsSel ;//: 1;
	UINT16 restart ;//: 1;
	} mode2;
	struct {
	//NR30 0xFF1A
	UINT16 unused_1 ;//: 7;
	UINT16 on_Off ;//: 1;

	//NR31 0xFF1B
	UINT16 soundLength;

	//NR32 0xFF1C
	UINT16 unused_2 ;//: 5;
	UINT16 selOutputLevel ;//: 2;
	UINT16 unused_3 ;//: 1;

	//NR33 0xFF1D
	UINT16 frequencyLow;

	//NR34 0xFF1E
	UINT16 frequencyHigh ;//: 3;
	UINT16 unused_4 ;//: 3;
	UINT16 counter_ConsSel ;//: 1;
	UINT16 restart ;//: 1;
	} mode3;
	struct {
	//NR40 0xFF1F
	UINT16 unused_1;

	//NR41 0xFF20
	UINT16 soundLength ;//: 6;
	UINT16 unused_2 ;//: 2;

	//NR42 0xFF21
	UINT16 envNbStep ;//: 3;
	UINT16 envMode ;//: 1;
	UINT16 envInitialValue ;//: 4;

	//NR43 0xFF22
	UINT16 polyCounterDiv ;//: 3;
	UINT16 polyCounterStep ;//: 1;
	UINT16 polyCounterFreq ;//: 4;

	//NR44 0xFF23
	UINT16 unused_3 ;//: 6;
	UINT16 counter_ConsSel ;//: 1;
	UINT16 restart ;//: 1;
	} mode4;
	struct {
	// NR50 0xFF24
	UINT16 SO1_OutputLevel ;//: 3;
	UINT16 Vin_SO1 ;//: 1;
	UINT16 SO2_OutputLevel ;//: 3;
	UINT16 Vin_SO2 ;//: 1;

	// NR51 0xFF25
	UINT16 Sound1_To_SO1 ;//: 1;
	UINT16 Sound2_To_SO1 ;//: 1;
	UINT16 Sound3_To_SO1 ;//: 1;
	UINT16 Sound4_To_SO1 ;//: 1;
	UINT16 Sound1_To_SO2 ;//: 1;
	UINT16 Sound2_To_SO2 ;//: 1;
	UINT16 Sound3_To_SO2 ;//: 1;
	UINT16 Sound4_To_SO2 ;//: 1;

	// NR52 0xFF26
	UINT16 Sound1_On_Off ;//: 1;
	UINT16 Sound2_On_Off ;//: 1;
	UINT16 Sound3_On_Off ;//: 1;
	UINT16 Sound4_On_Off ;//: 1;
	UINT16 unused_1 ;//: 3;
	UINT16 global_On_Off ;//: 1;
	} control;
	};