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samplerjit: Reduce DXT5 decode code size a bit.

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Unknown W. Brackets 2022-02-03 20:21:37 -08:00
parent f58d4dfcfe
commit c91b51c8e1
1 changed files with 9 additions and 9 deletions
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18
GPU/Software/SamplerX86.cpp
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@ -2118,16 +2118,16 @@ bool SamplerJitCache::Jit_ApplyDXTAlpha(const SamplerID &id) {
X64Reg alpha1Reg = regCache_.Alloc(RegCache::GEN_TEMP1);
X64Reg alpha2Reg = regCache_.Alloc(RegCache::GEN_TEMP2);
// And now the byte offset and bit from there, from those.
MOV(32, R(alphaIndexReg), R(uReg));
SHR(32, R(alphaIndexReg), Imm8(3));
AND(32, R(uReg), Imm32(7));
// Load 16 bits and mask, in case it straddles bytes.
X64Reg srcReg = regCache_.Find(RegCache::GEN_ARG_TEXPTR);
if (cpu_info.bBMI2) {
SHRX(32, alphaIndexReg, MComplex(srcReg, alphaIndexReg, SCALE_1, 8), uReg);
SHRX(64, alphaIndexReg, MDisp(srcReg, 8), uReg);
} else {
// And now the byte offset and bit from there, from those.
MOV(32, R(alphaIndexReg), R(uReg));
SHR(32, R(alphaIndexReg), Imm8(3));
AND(32, R(uReg), Imm32(7));
// Load 16 bits and mask, in case it straddles bytes.
MOVZX(32, 16, alphaIndexReg, MComplex(srcReg, alphaIndexReg, SCALE_1, 8));
// If not, it's in what was bufwReg.
if (uReg != RCX) {
@ -2155,7 +2155,6 @@ bool SamplerJitCache::Jit_ApplyDXTAlpha(const SamplerID &id) {
FixupBranch handleLerp8 = J_CC(CC_A);
// Okay, check for zero or full alpha, at alphaIndex 6 or 7.
XOR(32, R(srcReg), R(srcReg));
CMP(32, R(alphaIndexReg), Imm32(6));
FixupBranch finishZero = J_CC(CC_E, true);
// Remember, MOV doesn't affect flags.
@ -2212,7 +2211,6 @@ bool SamplerJitCache::Jit_ApplyDXTAlpha(const SamplerID &id) {
regCache_.Release(temp3Reg, RegCache::GEN_TEMP3);
SetJumpTarget(finishFull);
SetJumpTarget(finishZero);
SetJumpTarget(finishLerp6);
SetJumpTarget(finishLerp8);
@ -2222,6 +2220,8 @@ bool SamplerJitCache::Jit_ApplyDXTAlpha(const SamplerID &id) {
regCache_.Unlock(resultReg, RegCache::GEN_RESULT);
success = true;
SetJumpTarget(finishZero);
regCache_.Unlock(srcReg, RegCache::GEN_ARG_TEXPTR);
regCache_.ForceRelease(RegCache::GEN_ARG_TEXPTR);
}