Value *CreateShadowCast(IRBuilder<> &IRB, Value *V, Type *dstTy,
bool Signed = false) {
Type *srcTy = V->getType();
+ size_t srcSizeInBits = VectorOrPrimitiveTypeSizeInBits(srcTy);
+ size_t dstSizeInBits = VectorOrPrimitiveTypeSizeInBits(dstTy);
+ if (srcSizeInBits > 1 && dstSizeInBits == 1)
+ return IRB.CreateICmpNE(V, getCleanShadow(V));
+
if (dstTy->isIntegerTy() && srcTy->isIntegerTy())
return IRB.CreateIntCast(V, dstTy, Signed);
if (dstTy->isVectorTy() && srcTy->isVectorTy() &&
dstTy->getVectorNumElements() == srcTy->getVectorNumElements())
return IRB.CreateIntCast(V, dstTy, Signed);
- size_t srcSizeInBits = VectorOrPrimitiveTypeSizeInBits(srcTy);
- size_t dstSizeInBits = VectorOrPrimitiveTypeSizeInBits(dstTy);
Value *V1 = IRB.CreateBitCast(V, Type::getIntNTy(*MS.C, srcSizeInBits));
Value *V2 =
IRB.CreateIntCast(V1, Type::getIntNTy(*MS.C, dstSizeInBits), Signed);
--- /dev/null
+; Regression test for https://bugs.llvm.org/show_bug.cgi?id=32842
+;
+; RUN: opt < %s -msan -S | FileCheck %s
+;target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define zeroext i1 @_Z1fii(i32 %x, i32 %y) sanitize_memory {
+entry:
+ %cmp = icmp slt i32 %x, %y
+ ret i1 %cmp
+}
+
+; CHECK: [[X:[^ ]+]] = load{{.*}}__msan_param_tls{{.*}}
+; CHECK: [[Y:[^ ]+]] = load{{.*}}__msan_param_tls{{.*}}
+; CHECK: [[OR:[^ ]+]] = or i32 [[Y]], [[X]]
+
+; Make sure the shadow of the (x < y) comparison isn't truncated to i1.
+; CHECK-NOT: trunc i32 [[OR]] to i1
+; CHECK: [[CMP:[^ ]+]] = icmp ne i32 [[OR]], 0
+; CHECK: store i1 [[CMP]],{{.*}}__msan_retval_tls