Added tail call optimization to the x86 back end. It can be
enabled by passing -tailcallopt to llc. The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
elf/pic enabled + callee is in module + callee has
visibility protected or hidden
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42870 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/tailcallpic1.ll b/test/CodeGen/X86/tailcallpic1.ll
new file mode 100644
index 0000000..54074eb
--- /dev/null
+++ b/test/CodeGen/X86/tailcallpic1.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -tailcallopt -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep TAILCALL
+
+define protected fastcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
+entry:
+ ret i32 %a3
+}
+
+define fastcc i32 @tailcaller(i32 %in1, i32 %in2) {
+entry:
+ %tmp11 = tail call fastcc i32 @tailcallee( i32 %in1, i32 %in2, i32 %in1, i32 %in2 ) ; <i32> [#uses=1]
+ ret i32 %tmp11
+}