diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 8 | ||||
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.h | 4 | ||||
| -rw-r--r-- | lib/Target/X86/X86InstrMMX.td | 10 |
3 files changed, 20 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 4b6ab74582..ce9b0a89c0 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -14399,6 +14399,14 @@ static SDValue PerformEXTRACT_VECTOR_ELTCombine(SDNode *N, SelectionDAG &DAG, return NewOp; SDValue InputVector = N->getOperand(0); + // Detect whether we are trying to convert from mmx to i32 and the bitcast + // from mmx to v2i32 has a single usage. + if (InputVector.getNode()->getOpcode() == llvm::ISD::BITCAST && + InputVector.getNode()->getOperand(0).getValueType() == MVT::x86mmx && + InputVector.hasOneUse() && N->getValueType(0) == MVT::i32) + return DAG.getNode(X86ISD::MMX_MOVD2W, InputVector.getDebugLoc(), + N->getValueType(0), + InputVector.getNode()->getOperand(0)); // Only operate on vectors of 4 elements, where the alternative shuffling // gets to be more expensive. diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h index 55c34ac5db..732c6408a9 100644 --- a/lib/Target/X86/X86ISelLowering.h +++ b/lib/Target/X86/X86ISelLowering.h @@ -142,6 +142,10 @@ namespace llvm { /// mnemonic, so do I; blame Intel. MOVDQ2Q, + /// MMX_MOVD2W - Copies a 32-bit value from the low word of a MMX + /// vector to a GPR. + MMX_MOVD2W, + /// PEXTRB - Extract an 8-bit value from a vector and zero extend it to /// i32, corresponds to X86::PEXTRB. PEXTRB, diff --git a/lib/Target/X86/X86InstrMMX.td b/lib/Target/X86/X86InstrMMX.td index bd5485840d..127af6f7f9 100644 --- a/lib/Target/X86/X86InstrMMX.td +++ b/lib/Target/X86/X86InstrMMX.td @@ -207,8 +207,14 @@ def MMX_MOVD64rm : MMXI<0x6E, MRMSrcMem, (outs VR64:$dst), (ins i32mem:$src), let mayStore = 1 in def MMX_MOVD64mr : MMXI<0x7E, MRMDestMem, (outs), (ins i32mem:$dst, VR64:$src), "movd\t{$src, $dst|$dst, $src}", [], IIC_MMX_MOV_MM_RM>; -def MMX_MOVD64grr : MMXI<0x7E, MRMDestReg, (outs), (ins GR32:$dst, VR64:$src), - "movd\t{$src, $dst|$dst, $src}", [], IIC_MMX_MOV_REG_MM>; + +// Low word of MMX to GPR. +def MMX_X86movd2w : SDNode<"X86ISD::MMX_MOVD2W", SDTypeProfile<1, 1, + [SDTCisVT<0, i32>, SDTCisVT<1, x86mmx>]>>; +def MMX_MOVD64grr : MMXI<0x7E, MRMDestReg, (outs GR32:$dst), (ins VR64:$src), + "movd\t{$src, $dst|$dst, $src}", + [(set GR32:$dst, + (MMX_X86movd2w (x86mmx VR64:$src)))], IIC_MMX_MOV_REG_MM>; let neverHasSideEffects = 1 in def MMX_MOVD64to64rr : MMXRI<0x6E, MRMSrcReg, (outs VR64:$dst), (ins GR64:$src), |