diff options
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 3 | ||||
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.h | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index fa19e7d0635..08b2d04c5d0 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -16294,6 +16294,7 @@ static SDValue LowerSIGN_EXTEND(SDValue Op, const X86Subtarget *Subtarget, // may emit an illegal shuffle but the expansion is still better than scalar // code. We generate X86ISD::VSEXT for SEXTLOADs if it's available, otherwise // we'll emit a shuffle and a arithmetic shift. +// FIXME: Is the expansion actually better than scalar code? It doesn't seem so. // TODO: It is possible to support ZExt by zeroing the undef values during // the shuffle phase or after the shuffle. static SDValue LowerExtendedLoad(SDValue Op, const X86Subtarget *Subtarget, @@ -20399,6 +20400,8 @@ bool X86TargetLowering::isZExtFree(SDValue Val, EVT VT2) const { return false; } +bool X86TargetLowering::isVectorLoadExtDesirable(SDValue) const { return true; } + bool X86TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const { if (!(Subtarget->hasFMA() || Subtarget->hasFMA4())) diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h index d90dcc71451..eb904f31788 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.h +++ b/llvm/lib/Target/X86/X86ISelLowering.h @@ -744,6 +744,10 @@ namespace llvm { bool isZExtFree(EVT VT1, EVT VT2) const override; bool isZExtFree(SDValue Val, EVT VT2) const override; + /// Return true if folding a vector load into ExtVal (a sign, zero, or any + /// extend node) is profitable. + bool isVectorLoadExtDesirable(SDValue) const override; + /// Return true if an FMA operation is faster than a pair of fmul and fadd /// instructions. fmuladd intrinsics will be expanded to FMAs when this /// method returns true, otherwise fmuladd is expanded to fmul + fadd. |
