Avoid doing something dumb like rewriting using a 64-bit iv in 32-bit mode.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43446 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 172aa53..5decef2 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5125,7 +5125,11 @@
bool X86TargetLowering::isTruncateFree(const Type *Ty1, const Type *Ty2) const {
if (!Ty1->isInteger() || !Ty2->isInteger())
return false;
- return Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits();
+ unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
+ unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
+ if (NumBits1 <= NumBits2)
+ return false;
+ return Subtarget->is64Bit() || NumBits1 < 64;
}