From 26323442d5b8373391d9899159974c1f38f6f4d5 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Wed, 7 Dec 2011 00:11:56 +0000
Subject: Fix an optimization involving EXTRACT_SUBVECTOR in DAGCombine so it
 behaves correctly.  PR11494.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145996 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll

(limited to 'test')

diff --git a/test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll b/test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll
new file mode 100644
index 0000000000..fcaabddd2c
--- /dev/null
+++ b/test/CodeGen/X86/2011-12-06-AVXVectorExtractCombine.ll
@@ -0,0 +1,18 @@
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx -mattr=+avx | FileCheck %s
+; PR11494
+
+define void @test(<4 x i32>* nocapture %p) nounwind {
+  ; CHECK: test:
+  ; CHECK: vpxor %xmm0, %xmm0, %xmm0
+  ; CHECK-NEXT: vpmaxsd {{.*}}, %xmm0, %xmm0
+  ; CHECK-NEXT: vmovdqu	%xmm0, (%rdi)
+  ; CHECK-NEXT: ret
+  %a = call <4 x i32> @llvm.x86.sse41.pmaxsd(<4 x i32> <i32 -8, i32 -9, i32 -10, i32 -11>, <4 x i32> zeroinitializer) nounwind
+  %b = shufflevector <4 x i32> %a, <4 x i32> undef, <8 x i32> <i32 undef, i32 undef, i32 undef, i32 undef, i32 0, i32 1, i32 2, i32 3>
+  %c = shufflevector <8 x i32> %b, <8 x i32> undef, <4 x i32> <i32 4, i32 5, i32 6, i32 7>
+  store <4 x i32> %c, <4 x i32>* %p, align 1
+  ret void
+}
+
+declare <4 x i32> @llvm.x86.sse41.pminsd(<4 x i32>, <4 x i32>) nounwind readnone
+declare <4 x i32> @llvm.x86.sse41.pmaxsd(<4 x i32>, <4 x i32>) nounwind readnone
-- 
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