diff options
Diffstat (limited to 'include/llvm/Target/TargetLowering.h')
| -rw-r--r-- | include/llvm/Target/TargetLowering.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h index 41a4a2b838..d67e55dc66 100644 --- a/include/llvm/Target/TargetLowering.h +++ b/include/llvm/Target/TargetLowering.h @@ -1139,6 +1139,18 @@ public: /// TODO: Handle pre/postinc as well. virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const; + /// \brief Return the cost of the scaling factor used in the addressing + /// mode represented by AM for this target, for a load/store + /// of the specified type. + /// If the AM is supported, the return value must be >= 0. + /// If the AM is not supported, it returns a negative value. + /// TODO: Handle pre/postinc as well. + virtual int getScalingFactorCost(const AddrMode &AM, Type *Ty) const { + // Default: assume that any scaling factor used in a legal AM is free. + if (isLegalAddressingMode(AM, Ty)) return 0; + return -1; + } + /// isLegalICmpImmediate - Return true if the specified immediate is legal /// icmp immediate, that is the target has icmp instructions which can compare /// a register against the immediate without having to materialize the |