Add 'musttail' marker to call instructions
This is similar to the 'tail' marker, except that it guarantees that
tail call optimization will occur. It also comes with convervative IR
verification rules that ensure that tail call optimization is possible.
Reviewers: nicholas
Differential Revision: http://llvm-reviews.chandlerc.com/D3240
llvm-svn: 207143
diff --git a/llvm/test/Bitcode/tailcall.ll b/llvm/test/Bitcode/tailcall.ll
new file mode 100644
index 0000000..765b470
--- /dev/null
+++ b/llvm/test/Bitcode/tailcall.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+
+; Check that musttail and tail roundtrip.
+
+declare cc8191 void @t1_callee()
+define cc8191 void @t1() {
+; CHECK: tail call cc8191 void @t1_callee()
+ tail call cc8191 void @t1_callee()
+ ret void
+}
+
+declare cc8191 void @t2_callee()
+define cc8191 void @t2() {
+; CHECK: musttail call cc8191 void @t2_callee()
+ musttail call cc8191 void @t2_callee()
+ ret void
+}