diff options
Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 107 |
1 files changed, 103 insertions, 4 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index 1cdfb4178544..594472bbb47b 100644 --- a/contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/contrib/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -1279,6 +1279,99 @@ bool PPC::isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize, } } +/** + * \brief Common function used to match vmrgew and vmrgow shuffles + * + * The indexOffset determines whether to look for even or odd words in + * the shuffle mask. This is based on the of the endianness of the target + * machine. + * - Little Endian: + * - Use offset of 0 to check for odd elements + * - Use offset of 4 to check for even elements + * - Big Endian: + * - Use offset of 0 to check for even elements + * - Use offset of 4 to check for odd elements + * A detailed description of the vector element ordering for little endian and + * big endian can be found at + * http://www.ibm.com/developerworks/library/l-ibm-xl-c-cpp-compiler/index.html + * Targeting your applications - what little endian and big endian IBM XL C/C++ + * compiler differences mean to you + * + * The mask to the shuffle vector instruction specifies the indices of the + * elements from the two input vectors to place in the result. The elements are + * numbered in array-access order, starting with the first vector. These vectors + * are always of type v16i8, thus each vector will contain 16 elements of size + * 8. More info on the shuffle vector can be found in the + * http://llvm.org/docs/LangRef.html#shufflevector-instruction + * Language Reference. + * + * The RHSStartValue indicates whether the same input vectors are used (unary) + * or two different input vectors are used, based on the following: + * - If the instruction uses the same vector for both inputs, the range of the + * indices will be 0 to 15. In this case, the RHSStart value passed should + * be 0. + * - If the instruction has two different vectors then the range of the + * indices will be 0 to 31. In this case, the RHSStart value passed should + * be 16 (indices 0-15 specify elements in the first vector while indices 16 + * to 31 specify elements in the second vector). + * + * \param[in] N The shuffle vector SD Node to analyze + * \param[in] IndexOffset Specifies whether to look for even or odd elements + * \param[in] RHSStartValue Specifies the starting index for the righthand input + * vector to the shuffle_vector instruction + * \return true iff this shuffle vector represents an even or odd word merge + */ +static bool isVMerge(ShuffleVectorSDNode *N, unsigned IndexOffset, + unsigned RHSStartValue) { + if (N->getValueType(0) != MVT::v16i8) + return false; + + for (unsigned i = 0; i < 2; ++i) + for (unsigned j = 0; j < 4; ++j) + if (!isConstantOrUndef(N->getMaskElt(i*4+j), + i*RHSStartValue+j+IndexOffset) || + !isConstantOrUndef(N->getMaskElt(i*4+j+8), + i*RHSStartValue+j+IndexOffset+8)) + return false; + return true; +} + +/** + * \brief Determine if the specified shuffle mask is suitable for the vmrgew or + * vmrgow instructions. + * + * \param[in] N The shuffle vector SD Node to analyze + * \param[in] CheckEven Check for an even merge (true) or an odd merge (false) + * \param[in] ShuffleKind Identify the type of merge: + * - 0 = big-endian merge with two different inputs; + * - 1 = either-endian merge with two identical inputs; + * - 2 = little-endian merge with two different inputs (inputs are swapped for + * little-endian merges). + * \param[in] DAG The current SelectionDAG + * \return true iff this shuffle mask + */ +bool PPC::isVMRGEOShuffleMask(ShuffleVectorSDNode *N, bool CheckEven, + unsigned ShuffleKind, SelectionDAG &DAG) { + if (DAG.getTarget().getDataLayout()->isLittleEndian()) { + unsigned indexOffset = CheckEven ? 4 : 0; + if (ShuffleKind == 1) // Unary + return isVMerge(N, indexOffset, 0); + else if (ShuffleKind == 2) // swapped + return isVMerge(N, indexOffset, 16); + else + return false; + } + else { + unsigned indexOffset = CheckEven ? 0 : 4; + if (ShuffleKind == 1) // Unary + return isVMerge(N, indexOffset, 0); + else if (ShuffleKind == 0) // Normal + return isVMerge(N, indexOffset, 16); + else + return false; + } + return false; +} /// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift /// amount, otherwise return -1. @@ -3765,7 +3858,7 @@ struct TailCallArgumentInfo { TailCallArgumentInfo() : FrameIdx(0) {} }; -} // namespace +} /// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot. static void @@ -7046,7 +7139,9 @@ SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, PPC::isVMRGLShuffleMask(SVOp, 4, 1, DAG) || PPC::isVMRGHShuffleMask(SVOp, 1, 1, DAG) || PPC::isVMRGHShuffleMask(SVOp, 2, 1, DAG) || - PPC::isVMRGHShuffleMask(SVOp, 4, 1, DAG)) { + PPC::isVMRGHShuffleMask(SVOp, 4, 1, DAG) || + PPC::isVMRGEOShuffleMask(SVOp, true, 1, DAG) || + PPC::isVMRGEOShuffleMask(SVOp, false, 1, DAG)) { return Op; } } @@ -7064,7 +7159,9 @@ SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, PPC::isVMRGLShuffleMask(SVOp, 4, ShuffleKind, DAG) || PPC::isVMRGHShuffleMask(SVOp, 1, ShuffleKind, DAG) || PPC::isVMRGHShuffleMask(SVOp, 2, ShuffleKind, DAG) || - PPC::isVMRGHShuffleMask(SVOp, 4, ShuffleKind, DAG)) + PPC::isVMRGHShuffleMask(SVOp, 4, ShuffleKind, DAG) || + PPC::isVMRGEOShuffleMask(SVOp, true, ShuffleKind, DAG) || + PPC::isVMRGEOShuffleMask(SVOp, false, ShuffleKind, DAG)) return Op; // Check to see if this is a shuffle of 4-byte values. If so, we can use our @@ -9863,7 +9960,9 @@ SDValue PPCTargetLowering::expandVSXLoadForLE(SDNode *N, case ISD::INTRINSIC_W_CHAIN: { MemIntrinsicSDNode *Intrin = cast<MemIntrinsicSDNode>(N); Chain = Intrin->getChain(); - Base = Intrin->getBasePtr(); + // Similarly to the store case below, Intrin->getBasePtr() doesn't get + // us what we want. Get operand 2 instead. + Base = Intrin->getOperand(2); MMO = Intrin->getMemOperand(); break; } |