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https://github.com/PCSX2/pcsx2.git
synced 2026-09-10 14:52:58 +02:00
Gregory Hainaut
cf71049bd4
Help the compiler to generate better code
C code:
uint32 addr = (i >> 3u) % MAX_BLOCKS;
uint32 row = addr >> 5u;
uint32 col = 1 << (addr & 31u);
ASM Before
f48: mov eax,esi
f4a: mov ecx,esi
f4c: mov edx,DWORD PTR [ebp+0x8]
f4f: sar eax,0x1f
f52: sar ecx,0x3
f55: shr eax,0x12
f58: add ecx,eax
f5a: and ecx,0x3fff
f60: sub ecx,eax
f62: mov eax,0x1
f67: shl eax,cl
f69: shr ecx,0x5
f6c: lea edx,[edx+ecx*4]
ASM After
f48: mov ecx,edi
f4a: mov eax,0x1
f4f: sar ecx,0x3
f52: shl eax,cl
f54: shr ecx,0x3
f57: and ecx,0x7fc
f5d: add ecx,DWORD PTR [ebp+0x8]