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softjit: Optimize depth range checks.

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This was higher than I expected on the profile.  Not a huge improvement,
but a bit faster.
This commit is contained in:
Unknown W. Brackets 2022-01-02 20:07:52 -08:00
parent 961cfcd75c
commit 612cc0ab5c
1 changed files with 23 additions and 16 deletions
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39
GPU/Software/DrawPixelX86.cpp
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@ -337,24 +337,31 @@ void PixelJitCache::Discard(Gen::CCFlags cc) {
bool PixelJitCache::Jit_ApplyDepthRange(const PixelFuncID &id) {
if (id.applyDepthRange) {
Describe("ApplyDepthR");
X64Reg gstateReg = GetGState();
X64Reg minReg = regCache_.Alloc(RegCache::GEN_TEMP0);
X64Reg maxReg = regCache_.Alloc(RegCache::GEN_TEMP1);
// Only load the lowest 16 bits of each, but compare all 32 of z.
MOVZX(32, 16, minReg, MDisp(gstateReg, offsetof(GPUgstate, minz)));
MOVZX(32, 16, maxReg, MDisp(gstateReg, offsetof(GPUgstate, maxz)));
X64Reg gstateReg = INVALID_REG;
if (!RipAccessible(&gstate.minz) || !RipAccessible(&gstate.maxz))
gstateReg = GetGState();
X64Reg maxReg = regCache_.Alloc(RegCache::GEN_TEMP0);
X64Reg argZReg = regCache_.Find(RegCache::GEN_ARG_Z);
CMP(32, R(argZReg), R(minReg));
Discard(CC_L);
CMP(32, R(argZReg), R(maxReg));
Discard(CC_G);
regCache_.Unlock(argZReg, RegCache::GEN_ARG_Z);
regCache_.Unlock(gstateReg, RegCache::GEN_GSTATE);
regCache_.Release(minReg, RegCache::GEN_TEMP0);
regCache_.Release(maxReg, RegCache::GEN_TEMP1);
// For lower, we compare directly (we take care of the 32-bit case below.)
if (RipAccessible(&gstate.minz))
CMP(16, R(argZReg), M(&gstate.minz));
else
CMP(16, R(argZReg), MDisp(gstateReg, offsetof(GPUgstate, minz)));
Discard(CC_B);
// We load the low 16 bits, but compare all 32 of z. Above handles < 0.
if (RipAccessible(&gstate.maxz))
MOVZX(32, 16, maxReg, M(&gstate.maxz));
else
MOVZX(32, 16, maxReg, MDisp(gstateReg, offsetof(GPUgstate, maxz)));
CMP(32, R(argZReg), R(maxReg));
Discard(CC_A);
regCache_.Unlock(argZReg, RegCache::GEN_ARG_Z);
if (gstateReg != INVALID_REG)
regCache_.Unlock(gstateReg, RegCache::GEN_GSTATE);
regCache_.Release(maxReg, RegCache::GEN_TEMP0);
}
// Since this is early on, try to free up the z reg if we don't need it anymore.