diff options
Diffstat (limited to 'llvm/include')
| -rw-r--r-- | llvm/include/llvm/Target/TargetLowering.h | 53 |
1 files changed, 31 insertions, 22 deletions
diff --git a/llvm/include/llvm/Target/TargetLowering.h b/llvm/include/llvm/Target/TargetLowering.h index 24039ea1081..127a46dbf42 100644 --- a/llvm/include/llvm/Target/TargetLowering.h +++ b/llvm/include/llvm/Target/TargetLowering.h @@ -2388,30 +2388,39 @@ public: New = N; return true; } - - /// Check to see if the specified operand of the specified instruction is a - /// constant integer. If so, check to see if there are any bits set in the - /// constant that are not demanded. If so, shrink the constant and return - /// true. - bool ShrinkDemandedConstant(SDValue Op, const APInt &Demanded); - - /// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free. This - /// uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be - /// generalized for targets with other types of implicit widening casts. - bool ShrinkDemandedOp(SDValue Op, unsigned BitWidth, const APInt &Demanded, - const SDLoc &dl); - - /// Helper for SimplifyDemandedBits that can simplify an operation with - /// multiple uses. This function uses TLI.SimplifyDemandedBits to - /// simplify Operand \p OpIdx of \p User and then updated \p User with - /// the simplified version. No other uses of \p OpIdx are updated. - /// If \p User is the only user of \p OpIdx, this function behaves exactly - /// like TLI.SimplifyDemandedBits except that it also updates the DAG by - /// calling DCI.CommitTargetLoweringOpt. - bool SimplifyDemandedBits(SDNode *User, unsigned OpIdx, - const APInt &Demanded, DAGCombinerInfo &DCI); }; + /// Check to see if the specified operand of the specified instruction is a + /// constant integer. If so, check to see if there are any bits set in the + /// constant that are not demanded. If so, shrink the constant and return + /// true. + bool ShrinkDemandedConstant(SDValue Op, const APInt &Demanded, + TargetLoweringOpt &TLO) const; + + // Target hook to do target-specific const optimization, which is called by + // ShrinkDemandedConstant. This function should return true if the target + // doesn't want ShrinkDemandedConstant to further optimize the constant. + virtual bool targetShrinkDemandedConstant(SDValue Op, const APInt &Demanded, + TargetLoweringOpt &TLO) const { + return false; + } + + /// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free. This + /// uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be + /// generalized for targets with other types of implicit widening casts. + bool ShrinkDemandedOp(SDValue Op, unsigned BitWidth, const APInt &Demanded, + TargetLoweringOpt &TLO) const; + + /// Helper for SimplifyDemandedBits that can simplify an operation with + /// multiple uses. This function simplifies operand \p OpIdx of \p User and + /// then updates \p User with the simplified version. No other uses of + /// \p OpIdx are updated. If \p User is the only user of \p OpIdx, this + /// function behaves exactly like function SimplifyDemandedBits declared + /// below except that it also updates the DAG by calling + /// DCI.CommitTargetLoweringOpt. + bool SimplifyDemandedBits(SDNode *User, unsigned OpIdx, const APInt &Demanded, + DAGCombinerInfo &DCI, TargetLoweringOpt &TLO) const; + /// Look at Op. At this point, we know that only the DemandedMask bits of the /// result of Op are ever used downstream. If we can use this information to /// simplify Op, create a new simplified DAG node and return true, returning |
