Fix an oops in x86 sibcall optimization. If the ByVal callee argument is itself passed as a pointer, then it's obviously not safe to do a tail call.

llvm-svn: 97797

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/tailcall2.ll b/llvm/test/CodeGen/X86/tailcall2.ll
index 80bab619c16..90315fd2f26 100644
--- a/llvm/test/CodeGen/X86/tailcall2.ll
+++ b/llvm/test/CodeGen/X86/tailcall2.ll
@@ -195,3 +195,24 @@ bb2:
 }
 
 declare i32 @foo6(i32, i32, %struct.t* byval align 4)
+
+; rdar://r7717598
+%struct.ns = type { i32, i32 }
+%struct.cp = type { float, float }
+
+define %struct.ns* @t13(%struct.cp* %yy) nounwind ssp {
+; 32: t13:
+; 32-NOT: jmp
+; 32: call
+; 32: ret
+
+; 64: t13:
+; 64-NOT: jmp
+; 64: call
+; 64: ret
+entry:
+  %0 = tail call fastcc %struct.ns* @foo7(%struct.cp* byval align 4 %yy, i8 signext 0) nounwind
+  ret %struct.ns* %0
+}
+
+declare fastcc %struct.ns* @foo7(%struct.cp* byval align 4, i8 signext) nounwind ssp