diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 38 |
1 files changed, 13 insertions, 25 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 2090d32d08c..1aa7c422012 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -15492,8 +15492,7 @@ SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const { if (Subtarget.hasInt256()) { static const int ShufMask[] = {0, 2, 4, 6, -1, -1, -1, -1}; In = DAG.getBitcast(MVT::v8i32, In); - In = DAG.getVectorShuffle(MVT::v8i32, DL, In, DAG.getUNDEF(MVT::v8i32), - ShufMask); + In = DAG.getVectorShuffle(MVT::v8i32, DL, In, In, ShufMask); return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, In, DAG.getIntPtrConstant(0, DL)); } @@ -15513,26 +15512,16 @@ SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const { if (Subtarget.hasInt256()) { In = DAG.getBitcast(MVT::v32i8, In); - SmallVector<SDValue,32> pshufbMask; - for (unsigned i = 0; i < 2; ++i) { - pshufbMask.push_back(DAG.getConstant(0x0, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0x1, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0x4, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0x5, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0x8, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0x9, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0xc, DL, MVT::i8)); - pshufbMask.push_back(DAG.getConstant(0xd, DL, MVT::i8)); - for (unsigned j = 0; j < 8; ++j) - pshufbMask.push_back(DAG.getConstant(0x80, DL, MVT::i8)); - } - SDValue BV = DAG.getBuildVector(MVT::v32i8, DL, pshufbMask); - In = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v32i8, In, BV); + // The PSHUFB mask: + static const int ShufMask1[] = { 0, 1, 4, 5, 8, 9, 12, 13, + -1, -1, -1, -1, -1, -1, -1, -1, + 16, 17, 20, 21, 24, 25, 28, 29, + -1, -1, -1, -1, -1, -1, -1, -1 }; + In = DAG.getVectorShuffle(MVT::v32i8, DL, In, In, ShufMask1); In = DAG.getBitcast(MVT::v4i64, In); - static const int ShufMask[] = {0, 2, -1, -1}; - In = DAG.getVectorShuffle(MVT::v4i64, DL, In, DAG.getUNDEF(MVT::v4i64), - ShufMask); + static const int ShufMask2[] = {0, 2, -1, -1}; + In = DAG.getVectorShuffle(MVT::v4i64, DL, In, In, ShufMask2); In = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In, DAG.getIntPtrConstant(0, DL)); return DAG.getBitcast(VT, In); @@ -15551,9 +15540,8 @@ SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const { static const int ShufMask1[] = {0, 1, 4, 5, 8, 9, 12, 13, -1, -1, -1, -1, -1, -1, -1, -1}; - SDValue Undef = DAG.getUNDEF(MVT::v16i8); - OpLo = DAG.getVectorShuffle(MVT::v16i8, DL, OpLo, Undef, ShufMask1); - OpHi = DAG.getVectorShuffle(MVT::v16i8, DL, OpHi, Undef, ShufMask1); + OpLo = DAG.getVectorShuffle(MVT::v16i8, DL, OpLo, OpLo, ShufMask1); + OpHi = DAG.getVectorShuffle(MVT::v16i8, DL, OpHi, OpHi, ShufMask1); OpLo = DAG.getBitcast(MVT::v4i32, OpLo); OpHi = DAG.getBitcast(MVT::v4i32, OpHi); @@ -15577,8 +15565,8 @@ SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const { // Prepare truncation shuffle mask for (unsigned i = 0; i != NumElems; ++i) MaskVec[i] = i * 2; - SDValue V = DAG.getVectorShuffle(NVT, DL, DAG.getBitcast(NVT, In), - DAG.getUNDEF(NVT), MaskVec); + In = DAG.getBitcast(NVT, In); + SDValue V = DAG.getVectorShuffle(NVT, DL, In, In, MaskVec); return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, V, DAG.getIntPtrConstant(0, DL)); } |
