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[DAGCombiner] Combine shuffles of BUILD_VECTOR and SCALAR_TO_VECTOR

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This patch attempts to fold the shuffling of 'scalar source' inputs - BUILD_VECTOR and SCALAR_TO_VECTOR nodes - if the shuffle node is the only user. This folds away a lot of unnecessary shuffle nodes, and allows quite a bit of constant folding that was being missed.

Differential Revision: http://reviews.llvm.org/D8516

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234004 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim
2015-04-03 10:02:21 +00:00
parent c39f5dd0e2
commit 4e60da755a
11 changed files with 140 additions and 224 deletions
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2
test/CodeGen/X86/vec_insert-mmx.ll
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@@ -6,7 +6,7 @@ define x86_mmx @t0(i32 %A) nounwind {
; X86-32-LABEL: t0:
; X86-32: ## BB#0:
; X86-32: movd {{[0-9]+}}(%esp), %xmm0
; X86-32-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,0,0,1]
; X86-32-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,0,1,1]
; X86-32-NEXT: movlpd %xmm0, (%esp)
; X86-32-NEXT: movq (%esp), %mm0
; X86-32-NEXT: addl $12, %esp