Add a test for CodeGenPrepare's ability to look through PHI nodes when performing

addressing mode folding, introduced in r119853.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119857 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/CodeGenPrepare/phi.ll b/test/Transforms/CodeGenPrepare/phi.ll
new file mode 100644 (file)
index 0000000..29e17c0
--- /dev/null
+++ b/test/Transforms/CodeGenPrepare/phi.ll
@@ -0,0 +1,23 @@
+; RUN: llc -march=arm < %s | FileCheck %s
+; <rdar://problem/8686347>
+
+define i32 @test1(i1 %a, i32* %b) {
+; CHECK: test1
+entry:
+  br i1 %a, label %lblock, label %rblock
+
+lblock:
+  %lbranch = getelementptr i32* %b, i32 1
+  br label %end
+
+rblock:
+  %rbranch = getelementptr i32* %b, i32 1
+  br label %end
+  
+end:
+; CHECK: ldr   r0, [r1, #4]
+  %gep = phi i32* [%lbranch, %lblock], [%rbranch, %rblock]
+  %r = load i32* %gep
+; CHECK-NEXT: bx       lr
+  ret i32 %r
+}
\ No newline at end of file