Diagnose malformed x86 inline asm using 'y' constraint.
X86's 'y' inline assembly constraint represents an MMX register, this change
prevents Clang from hitting an assertion when passed an incompatible type to
deal with.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183467 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index c4ee724..6881ea7 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -503,8 +503,16 @@
static llvm::Type* X86AdjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
StringRef Constraint,
llvm::Type* Ty) {
- if ((Constraint == "y" || Constraint == "&y") && Ty->isVectorTy())
+ if ((Constraint == "y" || Constraint == "&y") && Ty->isVectorTy()) {
+ if (cast<llvm::VectorType>(Ty)->getBitWidth() != 64) {
+ // Invalid MMX constraint
+ return 0;
+ }
+
return llvm::Type::getX86_MMXTy(CGF.getLLVMContext());
+ }
+
+ // No operation needed
return Ty;
}