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shader: initialize compute EXEC from active subgroup

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This commit is contained in:
nmzik
2026-08-19 20:19:32 +02:00
parent 77db9164b8
commit 705fc93363
3 changed files with 39 additions and 11 deletions
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tests/shaderCfgTests.cpp
+26 -5
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@@ -8640,12 +8640,18 @@ void TestTypedEntryStateIsMinimal() {
uint32_t set_exec = 0;
uint32_t set_exec_lo = 0;
uint32_t set_exec_hi = 0;
uint32_t ballots = 0;
IR::Value exec;
IR::Value exec_lo;
IR::Value exec_hi;
const IR::Inst *ballot = nullptr;
for (const auto *block : values.blocks) {
for (const auto &inst : *block) {
switch (inst.GetOpcode()) {
case IR::ValueOpcode::Ballot:
ballots++;
ballot = &inst;
break;
case IR::ValueOpcode::SetExec:
set_exec++;
exec = inst.Arg(0).Resolve();
@@ -8677,14 +8683,29 @@ void TestTypedEntryStateIsMinimal() {
exec.IsImmediate() && exec.U1(),
"typed entry does not define EXEC exactly once");
if (lane_mode == ShaderLaneMaskMode::PerInvocation) {
Check(exec_lo.IsImmediate() && exec_lo.U32() == 1u &&
Check(ballots == 0u && exec_lo.IsImmediate() && exec_lo.U32() == 1u &&
exec_hi.IsImmediate() && exec_hi.U32() == 0u,
"per-invocation entry EXEC is not the local {1,0} mask");
} else {
Check(exec_lo.IsImmediate() && exec_lo.U32() == 0xffffffffu &&
exec_hi.IsImmediate() &&
exec_hi.U32() == (wave_size == 32u ? 0u : 0xffffffffu),
"native entry EXEC does not match the guest wave width");
Check(ballots == 1u && !exec_lo.IsImmediate(),
"native compute entry EXEC does not use the active subgroup mask");
const auto *lo = exec_lo.ResolveInstruction();
Check(lo != nullptr &&
lo->GetOpcode() == IR::ValueOpcode::CompositeExtractU32x4 &&
lo->Arg(0).ResolveInstruction() == ballot &&
lo->Arg(1).Resolve().U32() == 0u,
"native compute EXEC_LO does not use ballot word zero");
if (wave_size == 32u) {
Check(exec_hi.IsImmediate() && exec_hi.U32() == 0u,
"native wave32 entry defined EXEC_HI");
} else {
const auto *hi = exec_hi.ResolveInstruction();
Check(hi != nullptr &&
hi->GetOpcode() == IR::ValueOpcode::CompositeExtractU32x4 &&
hi->Arg(0).ResolveInstruction() == ballot &&
hi->Arg(1).Resolve().U32() == 1u,
"native wave64 EXEC_HI does not use ballot word one");
}
}
IR::RewriteToSsa(values.blocks);