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[msan] Handle x86 vector pack intrinsics.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2014-06-02 12:31:44 +00:00
parent ef8a99c807
commit dd7c5bb730
2 changed files with 74 additions and 0 deletions
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36
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@@ -1944,6 +1944,28 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
setOriginForNaryOp(I);
}
// \brief Instrument vector shift instrinsic.
//
// This function instruments intrinsics like x86_mmx_packsswb, that
// packs elements of 2 input vectors into half as much bits with saturation.
// Shadow is propagated with the same intrinsic applied to
// sext(Sa != zeroinitializer), sext(Sb != zeroinitializer).
void handleVectorPackIntrinsic(IntrinsicInst &I) {
assert(I.getNumArgOperands() == 2);
IRBuilder<> IRB(&I);
Value *S1 = getShadow(&I, 0);
Value *S2 = getShadow(&I, 1);
Type *T = S1->getType();
Value *S1_ext = IRB.CreateSExt(
IRB.CreateICmpNE(S1, llvm::Constant::getNullValue(T)), T);
Value *S2_ext = IRB.CreateSExt(
IRB.CreateICmpNE(S2, llvm::Constant::getNullValue(T)), T);
Value *S = IRB.CreateCall2(I.getCalledValue(), S1_ext, S2_ext,
"_msprop_vector_pack");
setShadow(&I, S);
setOriginForNaryOp(I);
}
void visitIntrinsicInst(IntrinsicInst &I) {
switch (I.getIntrinsicID()) {
case llvm::Intrinsic::bswap:
@@ -2060,6 +2082,20 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
// case llvm::Intrinsic::x86_sse2_psll_dq_bs:
// case llvm::Intrinsic::x86_sse2_psrl_dq_bs:
case llvm::Intrinsic::x86_sse2_packsswb_128:
case llvm::Intrinsic::x86_sse2_packssdw_128:
case llvm::Intrinsic::x86_sse2_packuswb_128:
case llvm::Intrinsic::x86_sse41_packusdw:
case llvm::Intrinsic::x86_avx2_packsswb:
case llvm::Intrinsic::x86_avx2_packssdw:
case llvm::Intrinsic::x86_avx2_packuswb:
case llvm::Intrinsic::x86_avx2_packusdw:
case llvm::Intrinsic::x86_mmx_packsswb:
case llvm::Intrinsic::x86_mmx_packssdw:
case llvm::Intrinsic::x86_mmx_packuswb:
handleVectorPackIntrinsic(I);
break;
default:
if (!handleUnknownIntrinsic(I))
visitInstruction(I);