From b2ed5fac0693e949ffdbf45266f5d53839211b63 Mon Sep 17 00:00:00 2001
From: Nadav Rotem <nrotem@apple.com>
Date: Wed, 1 May 2013 19:18:51 +0000
Subject: Optimize away nop CONCAT_VECTOR nodes.

Optimize CONCAT_VECTOR nodes that merge EXTRACT_SUBVECTOR values that extract from the same vector.

rdar://13402653
PR15866



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180871 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/ARM/nop_concat_vectors.ll | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 test/CodeGen/ARM/nop_concat_vectors.ll

(limited to 'test')

diff --git a/test/CodeGen/ARM/nop_concat_vectors.ll b/test/CodeGen/ARM/nop_concat_vectors.ll
new file mode 100644
index 0000000..c810900
--- /dev/null
+++ b/test/CodeGen/ARM/nop_concat_vectors.ll
@@ -0,0 +1,13 @@
+; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
+
+;CHECK: _foo
+;CHECK-NOT: vld1.32
+;CHECK-NOT: vst1.32
+;CHECK: bx
+define void @foo(<16 x i8>* %J) {
+  %A = load <16 x i8>* %J
+  %T1 = shufflevector <16 x i8> %A, <16 x i8> undef, <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
+  %T2 = shufflevector <8 x i8>  %T1, <8 x i8> undef, <16 x i32> <i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+  store <16 x i8> %T2, <16 x i8>* %J
+  ret void
+}
-- 
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