From cbd88adea66261a2f4372906fe1e08c2093d8718 Mon Sep 17 00:00:00 2001
From: Nate Begeman <natebegeman@mac.com>
Date: Sun, 1 Mar 2009 23:44:07 +0000
Subject: Fix a problem with DAGCombine on 64b targets where folding extracts +
 build_vector into a shuffle would fail, because the type of the new
 build_vector would not be legal.  Try harder to create a legal build_vector
 type.  Note: this will be totally irrelevant once vector_shuffle no longer
 takes a build_vector for shuffle mask.

New:
_foo:
	xorps	%xmm0, %xmm0
	xorps	%xmm1, %xmm1
	subps	%xmm1, %xmm1
	mulps	%xmm0, %xmm1
	addps	%xmm0, %xmm1
	movaps	%xmm1, 0

Old:
_foo:
	xorps	%xmm0, %xmm0
	movss	%xmm0, %xmm1
	xorps	%xmm2, %xmm2
	unpcklps	%xmm1, %xmm2
	pshufd	$80, %xmm1, %xmm1
	unpcklps	%xmm1, %xmm2
	pslldq	$16, %xmm2
	pshufd	$57, %xmm2, %xmm1
	subps	%xmm0, %xmm1
	mulps	%xmm0, %xmm1
	addps	%xmm0, %xmm1
	movaps	%xmm1, 0



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65791 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/extract-combine.ll | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 test/CodeGen/X86/extract-combine.ll

(limited to 'test/CodeGen/X86')

diff --git a/test/CodeGen/X86/extract-combine.ll b/test/CodeGen/X86/extract-combine.ll
new file mode 100644
index 0000000000..9172dced05
--- /dev/null
+++ b/test/CodeGen/X86/extract-combine.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | llc -march=x86-64 -mcpu=core2 -o %t -f
+; RUN: not grep unpcklps %t
+
+define i32 @foo() nounwind {
+entry:
+	%tmp74.i25762 = shufflevector <16 x float> zeroinitializer, <16 x float> zeroinitializer, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 16, i32 17, i32 18, i32 19>		; <<16 x float>> [#uses=1]
+	%tmp518 = shufflevector <16 x float> %tmp74.i25762, <16 x float> undef, <4 x i32> <i32 12, i32 13, i32 14, i32 15>		; <<4 x float>> [#uses=1]
+	%movss.i25611 = shufflevector <4 x float> zeroinitializer, <4 x float> %tmp518, <4 x i32> <i32 4, i32 1, i32 2, i32 3>		; <<4 x float>> [#uses=1]
+	%conv3.i25615 = shufflevector <4 x float> %movss.i25611, <4 x float> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0>		; <<4 x float>> [#uses=1]
+	%sub.i25620 = sub <4 x float> %conv3.i25615, zeroinitializer		; <<4 x float>> [#uses=1]
+	%mul.i25621 = mul <4 x float> zeroinitializer, %sub.i25620		; <<4 x float>> [#uses=1]
+	%add.i25622 = add <4 x float> zeroinitializer, %mul.i25621		; <<4 x float>> [#uses=1]
+	store <4 x float> %add.i25622, <4 x float>* null
+	unreachable
+}
-- 
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