diff options
Diffstat (limited to 'lib/Target')
| -rw-r--r-- | lib/Target/ARM/ARMISelLowering.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h index cb5b680..c7331bd 100644 --- a/lib/Target/ARM/ARMISelLowering.h +++ b/lib/Target/ARM/ARMISelLowering.h @@ -458,6 +458,17 @@ namespace llvm { SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG, const ARMSubtarget *ST) const; + /// isFMAFasterThanFMulAndFAdd - 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. + /// + /// ARM supports both fused and unfused multiply-add operations; we already + /// lower a pair of fmul and fmadd to the latter so it's not clear that there + /// would be a gain or that the gain would be worthwhile enough to risk + /// correctness bugs. + virtual bool isFMAFasterThanFMulAndFAdd(EVT VT) const { return false; } + SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const; SDValue LowerCallResult(SDValue Chain, SDValue InFlag, |