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SelectionDAG: Aggressively fold shuffles of constant splats.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2014-04-27 11:41:06 +00:00
parent f090afddb4
commit 55e03c1992
2 changed files with 10 additions and 3 deletions
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5
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1441,6 +1441,11 @@ SDValue SelectionDAG::getVectorShuffle(EVT VT, SDLoc dl, SDValue N1,
if (Identity && NElts)
return N1;
// Shuffling a constant splat doesn't change the result.
if (N2Undef && N1.getOpcode() == ISD::BUILD_VECTOR)
if (cast<BuildVectorSDNode>(N1)->getConstantSplatValue())
return N1;
FoldingSetNodeID ID;
SDValue Ops[2] = { N1, N2 };
AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);

8
test/CodeGen/X86/vector-idiv.ll
View File

@ -115,6 +115,7 @@ define <4 x i32> @test8(<4 x i32> %a) {
; SSE-LABEL: test8:
; SSE: pmuldq
; SSE: pshufd $57
; SSE-NOT: pshufd $57
; SSE: pmuldq
; SSE: shufps $-35
; SSE: pshufd $-40
@ -126,6 +127,7 @@ define <4 x i32> @test8(<4 x i32> %a) {
; AVX-LABEL: test8:
; AVX: vpmuldq
; AVX: vpshufd $57
; AVX-NOT: vpshufd $57
; AVX: vpmuldq
; AVX: vshufps $-35
; AVX: vpshufd $-40
@ -140,7 +142,7 @@ define <8 x i32> @test9(<8 x i32> %a) {
ret <8 x i32> %div
; AVX-LABEL: test9:
; AVX: vpermd
; AVX: vpbroadcastd
; AVX: vpmuldq
; AVX: vshufps $-35
; AVX: vpmuldq
@ -157,7 +159,7 @@ define <8 x i32> @test10(<8 x i32> %a) {
ret <8 x i32> %rem
; AVX-LABEL: test10:
; AVX: vpermd
; AVX: vpbroadcastd
; AVX: vpmuludq
; AVX: vshufps $-35
; AVX: vpmuludq
@ -174,7 +176,7 @@ define <8 x i32> @test11(<8 x i32> %a) {
ret <8 x i32> %rem
; AVX-LABEL: test11:
; AVX: vpermd
; AVX: vpbroadcastd
; AVX: vpmuldq
; AVX: vshufps $-35
; AVX: vpmuldq