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shader: evaluate scalar branch decisions across the complete guest wave

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This commit is contained in:
Claxten
2026-10-07 19:18:50 +04:00
committed by nmzik
parent b96871e2bf
commit a8beac190f
4 changed files with 68 additions and 25 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+8 -16
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@@ -713,26 +713,18 @@ uint32_t EmitDppUpdateU32(ValueEmitContext& ctx, const IR::Inst& inst) {
}
uint32_t EmitConditionRef(ValueEmitContext& ctx, const IR::Inst& inst) {
if (ctx.other_half == nullptr) return ctx.Arg(inst, 0);
// A native scalar branch makes one decision for both emulated wave halves.
if (ctx.half != 0) return ctx.other_half->Def(IR::Value(&inst));
// Scalar branches include lanes disabled by EXEC, which the branch body may restore.
if (ctx.other_half != nullptr && ctx.half != 0) return ctx.other_half->Def(IR::Value(&inst));
const auto kind = inst.Flags<CFG::BranchCondition>();
if (kind == CFG::BranchCondition::ScalarInstruction) return ctx.Arg(inst, 0);
const auto ballot = ctx.Ballot(inst.Arg(0));
const auto low = ctx.state.builder.AllocateId();
const auto high = ctx.state.builder.AllocateId();
const auto combined = ctx.state.builder.AllocateId();
const auto result = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(spv::OpCompositeExtract, TypeU32(ctx.state), low, ballot, 0);
ctx.state.builder.AddFunction(spv::OpCompositeExtract, TypeU32(ctx.state), high, ballot, 1);
const bool zero = kind == CFG::BranchCondition::ExecZero ||
kind == CFG::BranchCondition::VccZero || kind == CFG::BranchCondition::SccZero;
ctx.state.builder.AddFunction(zero ? spv::OpBitwiseAnd : spv::OpBitwiseOr,
TypeU32(ctx.state), combined, low, high);
ctx.state.builder.AddFunction(zero ? spv::OpIEqual : spv::OpINotEqual,
TypeBool(ctx.state), result, combined,
ConstantU32(ctx.state, zero ? ~0u : 0u));
return result;
const auto ballot = ctx.Ballot(inst.Arg(0));
const auto reference = zero ? ctx.Ballot(IR::Value(true))
: ConstantU32CompositeZero(ctx.state, 4);
const auto compare = Binary(ctx.state, zero ? spv::OpIEqual : spv::OpINotEqual,
TypeBoolVector(ctx.state, 4), ballot, reference);
return Unary(ctx.state, zero ? spv::OpAll : spv::OpAny, TypeBool(ctx.state), compare);
}
uint32_t EmitBallot(ValueEmitContext& ctx, IR::Value predicate) {