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[msan] Handle AVX512 pack with saturation intrinsics #157984

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Merged
merged 1 commit into from
Sep 11, 2025
+453 −736
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[msan] Handle AVX512 pack with saturation intrinsics #157984

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21 changes: 21 additions & 0 deletions llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3684,6 +3684,15 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {

case Intrinsic::x86_mmx_packssdw:
return Intrinsic::x86_mmx_packssdw;

case Intrinsic::x86_avx512_packssdw_512:
case Intrinsic::x86_avx512_packusdw_512:
return Intrinsic::x86_avx512_packssdw_512;

case Intrinsic::x86_avx512_packsswb_512:
case Intrinsic::x86_avx512_packuswb_512:
return Intrinsic::x86_avx512_packsswb_512;

default:
llvm_unreachable("unexpected intrinsic id");
}
Expand All @@ -3696,6 +3705,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
// Shadow is propagated with the signed variant of the same intrinsic applied
// to sext(Sa != zeroinitializer), sext(Sb != zeroinitializer).
// MMXEltSizeInBits is used only for x86mmx arguments.
//
// TODO: consider using GetMinMaxUnsigned() to handle saturation precisely
void handleVectorPackIntrinsic(IntrinsicInst &I,
unsigned MMXEltSizeInBits = 0) {
assert(I.arg_size() == 2);
Expand Down Expand Up @@ -5554,6 +5565,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
handleVectorShiftIntrinsic(I, /* Variable */ true);
break;

// Pack with Signed/Unsigned Saturation
case Intrinsic::x86_sse2_packsswb_128:
case Intrinsic::x86_sse2_packssdw_128:
case Intrinsic::x86_sse2_packuswb_128:
Expand All @@ -5562,6 +5574,15 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
case Intrinsic::x86_avx2_packssdw:
case Intrinsic::x86_avx2_packuswb:
case Intrinsic::x86_avx2_packusdw:
// e.g., <64 x i8> @llvm.x86.avx512.packsswb.512
// (<32 x i16> %a, <32 x i16> %b)
// <32 x i16> @llvm.x86.avx512.packssdw.512
// (<16 x i32> %a, <16 x i32> %b)
// Note: AVX512 masked variants are auto-upgraded by LLVM.
case Intrinsic::x86_avx512_packsswb_512:
case Intrinsic::x86_avx512_packssdw_512:
case Intrinsic::x86_avx512_packuswb_512:
case Intrinsic::x86_avx512_packusdw_512:
handleVectorPackIntrinsic(I);
break;

Expand Down
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