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shader: fold the lane test after a pixel shader's entry s_wqm (#801)

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Preserve live lane predicates through RDNA2 whole-quad expansion

Keep the source-live predicate when WQM expands a scalar mask, so entry masks remain known live without an instruction pre-scan. Preserve scalar mask values, SCC, half writes, and raw-source behavior.

Cover entry pixel masks, cross-half copies, and scalar/high-word sources with existing shader regression suites.

Co-authored-by: nmzik <Nmzik@mail.ru>
Co-authored-by: Douglas <douglasproducoes21@gmail.com>
This commit is contained in:
Douglas Soares Silva
2026-09-24 05:02:19 -03:00
committed by GitHub
parent 84d015120c
commit fcf0f3b67e
3 changed files with 136 additions and 8 deletions
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tests/shaderCfgTests.cpp
+21
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@@ -11508,6 +11508,27 @@ void TestNewShaderRecompilerVertexExportUsesInvocationExecMask() {
}
void TestNewShaderRecompilerPerInvocationMasksWithoutMirrors() {
for (uint32_t wave_size : {32u, 64u}) {
for (uint32_t opcode : {0x09u, 0x0au}) {
for (uint32_t source : {126u, 8u}) {
const uint32_t pixel_shader[] = {
EncodeSop1(0x04, 8, 126), // Save the entry live mask.
EncodeSop1(opcode, 126, source),
EncodeVop1(0x01, 0, 242), // v_mov_b32 v0, 1.0
EncodeExp0(0x00, 0x1), EncodeExp1(0, 0, 0, 0),
EncodeSopp(0x01),
};
auto pixel_options = MakeCompileOptions(ShaderType::Pixel);
pixel_options.wave_size = wave_size;
const auto pixel_result = RecompileForTest(pixel_shader, pixel_options);
CheckSpirvBinaryValidates(pixel_result.spirv);
Check(DisassembleSpirvBinary(pixel_result.spirv).find("OpGroupNonUniformBallot") ==
std::string::npos,
"entry WQM lost the known live predicate through a scalar ballot");
}
}
}
const uint32_t local_shader[] = {
EncodeVopc(0xc1, 5 + 256, 8), // v_cmp_lt_u32 vcc, v5, v8
EncodeSop2(0x0f, 2, 126, 106), // s_and_b64 s[2:3], exec, vcc