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shader: fix incorrect per-lane VCCZ/EXECZ reads

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This commit is contained in:
nmzik
2026-09-09 13:22:09 +04:00
parent 32ea0869e5
commit 1af19eabf0
2 changed files with 29 additions and 5 deletions
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tests/ShaderRecompilerComputeTests.cpp
+20
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@@ -14982,16 +14982,36 @@ TestCase ScalarOrn2SaveexecB32(u32 wave_size, u32 threads) {
{0xffffffffu, 107, 8, vcc_hi},
{0xffffffffu, 127, 8, exec_hi},
{0xffffffffu, 253, 8, 1}, // SCC is a scalar value, not a mask.
{0xffffffffu, 251, 8, 0}, // VCCZ summarizes the whole mask.
{0x00000001u, 252, 8, 0xfffffffeu}, // EXECZ is uniform across lanes.
};
TestCase test;
test.name = wave_size == 64 ? "ScalarOrn2SaveexecB32Wave64"
: threads == 32 ? "ScalarOrn2SaveexecB32Wave32"
: "ScalarOrn2SaveexecB32PartialWave";
auto &code = test.code;
// Zero flags ignore high bits only in wave32 and include inactive low bits.
constexpr u32 masks[][2] = {{0, 0}, {0x80000000u, 0}, {0, 0x80000000u}};
for (const auto &mask : masks) {
AppendSMovLiteral(&code, 106, mask[0]);
AppendSMovLiteral(&code, 107, mask[1]);
AppendSMovLiteral(&code, 126, mask[0]);
AppendSMovLiteral(&code, 127, mask[1]);
code.push_back(EncodeSMovB32(20, 251));
code.push_back(EncodeSMovB32(21, 252));
code.push_back(EncodeSop1(0x04, 126, 193u));
const u32 zero = mask[0] == 0 && (wave_size == 32 || mask[1] == 0);
for (u32 reg = 20; reg <= 21; ++reg) {
AppendStoreSgprAtLaneDwordOffset(&code, reg, 0,
static_cast<u32>(test.expected.size()));
test.expected.insert(test.expected.end(), threads, zero);
}
}
for (const auto &item : cases) {
AppendVMovU32(&code, 2, 0);
AppendSMovLiteral(&code, 126, item.exec_lo);
AppendSMovLiteral(&code, 127, exec_hi);
AppendSMovLiteral(&code, 106, 1);
AppendSMovLiteral(&code, 107, vcc_hi);
AppendSMovLiteral(&code, 6, 3);
code.push_back(EncodeSopc(0x06, InlineU32(0), InlineU32(0)));