From fdaf59e9b1fb5325d73e61427d7f3f5e90a9891a Mon Sep 17 00:00:00 2001 From: Chandler Carruth Date: Sun, 21 Sep 2014 11:40:39 +0000 Subject: [PATCH] [x86] Explicitly lower to a blend early if it is trivial to do so for v8f32 shuffles in the new vector shuffle lowering code. This is very cheap to do and makes it much more clear that anything more expensive but overlapping with this lowering should be selected afterward (for example using AVX2's VPERMPS). However, no functionality changed here as without this code we would fall through to create no-op shuffles of each input and a blend. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218209 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86ISelLowering.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index a3871339a49..bfe52247b7a 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -7238,6 +7238,7 @@ static SDValue lowerVectorShuffleAsBlend(SDLoc DL, MVT VT, SDValue V1, case MVT::v2f64: case MVT::v4f32: case MVT::v4f64: + case MVT::v8f32: return DAG.getNode(X86ISD::BLENDI, DL, VT, V1, V2, DAG.getConstant(BlendMask, MVT::i8)); @@ -9319,6 +9320,10 @@ static SDValue lowerV8F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2, isSingleInputShuffleMask(Mask)) return splitAndLower256BitVectorShuffle(Op, V1, V2, Subtarget, DAG); + if (SDValue Blend = + lowerVectorShuffleAsBlend(DL, MVT::v8f32, V1, V2, Mask, DAG)) + return Blend; + // Shuffle the input elements into the desired positions in V1 and V2 and // blend them together. int V1Mask[] = {-1, -1, -1, -1, -1, -1, -1, -1}; -- 2.34.1