Generate a compact unwind encoding in the face of a stack alignment push.

[oota-llvm.git] / test / CodeGen / X86 / compact-unwind.ll

diff --git a/test/CodeGen/X86/compact-unwind.ll b/test/CodeGen/X86/compact-unwind.ll
new file mode 100644 (file)
index 0000000..8c4fa27
--- /dev/null
+++ b/test/CodeGen/X86/compact-unwind.ll
@@ -0,0 +1,30 @@
+; RUN: llc < %s -disable-cfi -disable-fp-elim -mtriple x86_64-apple-darwin11 | FileCheck %s
+
+%ty = type { i8* }
+
+@gv = external global i32
+
+; This is aligning the stack with a push of a random register.
+; CHECK: pushq %rax
+
+; Even though we can't encode %rax into the compact unwind, We still want to be
+; able to generate a compact unwind encoding in this particular case.
+;
+; CHECK: __LD,__compact_unwind
+; CHECK: _foo ## Range Start
+; CHECK: 16842753 ## Compact Unwind Encoding: 0x1010001
+
+define i8* @foo(i64 %size) {
+  %addr = alloca i64, align 8
+  %tmp20 = load i32* @gv, align 4
+  %tmp21 = call i32 @bar()
+  %tmp25 = load i64* %addr, align 8
+  %tmp26 = inttoptr i64 %tmp25 to %ty*
+  %tmp29 = getelementptr inbounds %ty* %tmp26, i64 0, i32 0
+  %tmp34 = load i8** %tmp29, align 8
+  %tmp35 = getelementptr inbounds i8* %tmp34, i64 %size
+  store i8* %tmp35, i8** %tmp29, align 8
+  ret i8* null
+}
+
+declare i32 @bar()