diff options
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 5 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/vector-idiv.ll | 8 |
2 files changed, 10 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3f68d49da68..46d0fcac410 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -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); diff --git a/llvm/test/CodeGen/X86/vector-idiv.ll b/llvm/test/CodeGen/X86/vector-idiv.ll index 3b300f74061..981c317157f 100644 --- a/llvm/test/CodeGen/X86/vector-idiv.ll +++ b/llvm/test/CodeGen/X86/vector-idiv.ll @@ -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 |
