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x64 Shader JIT: Optimize SSE4.1 blending path

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Co-Authored-By: Burhan R <53955076+burhanr13@users.noreply.github.com>
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wheremyfoodat 2024-11-28 21:00:26 +02:00
parent 72b4194c95
commit 87652bfeda
2 changed files with 5 additions and 6 deletions
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9
src/core/PICA/dynapica/shader_rec_emitter_x64.cpp
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@ -370,12 +370,11 @@ void ShaderEmitter::storeRegister(Xmm source, const PICAShader& shader, u32 dest
} else if (haveSSE4_1) {
// Bit reverse the write mask because that is what blendps expects
u32 adjustedMask = ((writeMask >> 3) & 0b1) | ((writeMask >> 1) & 0b10) | ((writeMask << 1) & 0b100) | ((writeMask << 3) & 0b1000);
// Don't accidentally overwrite scratch1 if that is what we're writing derp
Xmm temp = (source == scratch1) ? scratch2 : scratch1;
movaps(temp, xword[statePointer + offset]); // Read current value of dest
blendps(temp, source, adjustedMask); // Blend with source
movaps(xword[statePointer + offset], temp); // Write back
// Blend current value of dest with source. We have to invert the bits of the mask, as we do blendps source, dest instead of dest, source
// Note: This destroys source
blendps(source, xword[statePointer + offset], adjustedMask ^ 0xF);
movaps(xword[statePointer + offset], source); // Write back
} else {
// Blend algo referenced from Citra
const u8 selector = (((writeMask & 0b1000) ? 1 : 0) << 0) |