Do not use IR marker for LLVM intrinsics
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index bb274a9..6ab68db 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -334,10 +334,11 @@
// another has a "\01foo". That is known to happen on ELF with the
// tricks normally used for producing aliases (PR9177). Fortunately the
// llvm mangler on ELF is a nop, so we can just avoid adding the \01
- // marker.
+ // marker. We also avoid adding the marker if this is an alias for an
+ // LLVM intrinsic.
llvm::StringRef UserLabelPrefix =
getASTContext().Target.getUserLabelPrefix();
- if (!UserLabelPrefix.empty())
+ if (!UserLabelPrefix.empty() && !ALA->getLabel().startswith("llvm."))
Out << '\01'; // LLVM IR Marker for __asm("foo")
Out << ALA->getLabel();
diff --git a/test/CodeGen/mangle.c b/test/CodeGen/mangle.c
index 3bbd9c8..46ef512 100644
--- a/test/CodeGen/mangle.c
+++ b/test/CodeGen/mangle.c
@@ -63,3 +63,12 @@
// CHECK: @_Z4foo9Dv4_f
typedef __attribute__(( vector_size(16) )) float float4;
void __attribute__((__overloadable__)) foo9(float4 f) {}
+
+// Intrinsic calls.
+extern int llvm_cas(volatile int*, int, int)
+ __asm__("llvm.atomic.cmp.swap.i32.p0i32");
+
+int foo10(volatile int* add, int from, int to) {
+ // CHECK: call i32 @llvm.atomic.cmp.swap.i32.p0i32
+ return llvm_cas(add, from, to);
+}