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shader: emit DPP row_share instead of an identity move

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This commit is contained in:
Bartlomiej Wolynczyk
2026-10-06 14:22:09 +00:00
committed by nmzik
parent f3836bb831
commit 053f5fd3cc
2 changed files with 64 additions and 0 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterHelpers.cpp
+10
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@@ -115,6 +115,16 @@ DppTargetLane EmitDppTargetLane(EmitterState& state, const IR::DppMoveFlags& fla
if (control == 0x141u) {
return EmitDppMirrorTargetLane(state, subid, true);
}
// row_share:N reads lane N of the caller's row of 16.
if (control >= 0x150u && control <= 0x15fu) {
const auto row = state.builder.AllocateId();
const auto target = state.builder.AllocateId();
state.builder.AddFunction(spv::OpBitwiseAnd, TypeU32(state), row, subid,
ConstantU32(state, 0xfffffff0u));
state.builder.AddFunction(spv::OpBitwiseOr, TypeU32(state), target, row,
ConstantU32(state, control & 0xfu));
return {target, ConstantBool(state, true)};
}
if (control >= 0x160u && control <= 0x16fu) {
const auto target = state.builder.AllocateId();
state.builder.AddFunction(spv::OpBitwiseXor, TypeU32(state), target, subid,