diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 469312507be..6265e79891d 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -20740,6 +20740,25 @@ static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG, } } + // We should generate an X86ISD::BLENDI from a vselect if its argument + // is a sign_extend_inreg of an any_extend of a BUILD_VECTOR of + // constants. This specific pattern gets generated when we split a + // selector for a 512 bit vector in a machine without AVX512 (but with + // 256-bit vectors), during legalization: + // + // (vselect (sign_extend (any_extend (BUILD_VECTOR)) i1) LHS RHS) + // + // Iff we find this pattern and the build_vectors are built from + // constants, we translate the vselect into a shuffle_vector that we + // know will be matched by LowerVECTOR_SHUFFLEtoBlend. + if ((N->getOpcode() == ISD::VSELECT || + N->getOpcode() == X86ISD::SHRUNKBLEND) && + !DCI.isBeforeLegalize()) { + SDValue Shuffle = transformVSELECTtoBlendVECTOR_SHUFFLE(N, DAG, Subtarget); + if (Shuffle.getNode()) + return Shuffle; + } + // If we know that this node is legal then we know that it is going to be // matched by one of the SSE/AVX BLEND instructions. These instructions only // depend on the highest bit in each word. Try to use SimplifyDemandedBits @@ -20810,25 +20829,6 @@ static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG, } } - // We should generate an X86ISD::BLENDI from a vselect if its argument - // is a sign_extend_inreg of an any_extend of a BUILD_VECTOR of - // constants. This specific pattern gets generated when we split a - // selector for a 512 bit vector in a machine without AVX512 (but with - // 256-bit vectors), during legalization: - // - // (vselect (sign_extend (any_extend (BUILD_VECTOR)) i1) LHS RHS) - // - // Iff we find this pattern and the build_vectors are built from - // constants, we translate the vselect into a shuffle_vector that we - // know will be matched by LowerVECTOR_SHUFFLEtoBlend. - if ((N->getOpcode() == ISD::VSELECT || - N->getOpcode() == X86ISD::SHRUNKBLEND) && - !DCI.isBeforeLegalize()) { - SDValue Shuffle = transformVSELECTtoBlendVECTOR_SHUFFLE(N, DAG, Subtarget); - if (Shuffle.getNode()) - return Shuffle; - } - return SDValue(); }