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Use better popcount than the GCC one...

This commit is contained in:
Jeffrey Pfau 2014-10-22 22:01:11 -07:00
parent 5340cb300b
commit 1619b760e1
1 changed files with 10 additions and 2 deletions
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12
src/gba/gba-memory.c
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@ -8,6 +8,8 @@
#include "hle-bios.h"
#include "util/memory.h"
static uint32_t _popcount32(unsigned bits);
static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t region);
static void GBAMemoryServiceDMA(struct GBA* gba, int number, struct GBADMA* info);
@ -650,7 +652,7 @@ uint32_t GBALoadMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum L
int popcount = 0;
if (direction & LSM_D) {
offset = -4;
popcount = __builtin_popcount(mask);
popcount = _popcount32(mask);
address -= (popcount << 2) - 4;
}
@ -754,7 +756,7 @@ uint32_t GBAStoreMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum
int popcount = 0;
if (direction & LSM_D) {
offset = -4;
popcount = __builtin_popcount(mask);
popcount = _popcount32(mask);
address -= (popcount << 2) - 4;
}
@ -1143,3 +1145,9 @@ void GBAMemoryDeserialize(struct GBAMemory* memory, struct GBASerializedState* s
memcpy(memory->wram, state->wram, SIZE_WORKING_RAM);
memcpy(memory->iwram, state->iwram, SIZE_WORKING_IRAM);
}
uint32_t _popcount32(unsigned bits) {
bits = bits - ((bits >> 1) & 0x55555555);
bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333);
return (((bits + (bits >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
}