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[RISCV] Implement isLegalICmpImmediate 

I'm unable to construct a representative test case that demonstrates the 
advantage, but it seems sensible to report accurate target-specific 
information regardless.

llvm-svn: 330938
This commit is contained in:
Alex Bradbury 2018-04-26 13:15:17 +00:00
parent 5c41ecedf8
commit dcbff63c24
2 changed files with 5 additions and 0 deletions
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4
llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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@ -183,6 +183,10 @@ bool RISCVTargetLowering::isLegalAddressingMode(const DataLayout &DL,
return true;
}
bool RISCVTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
return isInt<12>(Imm);
}
bool RISCVTargetLowering::isLegalAddImmediate(int64_t Imm) const {
return isInt<12>(Imm);
}

1
llvm/lib/Target/RISCV/RISCVISelLowering.h
View File

@ -42,6 +42,7 @@ public:
bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
unsigned AS,
Instruction *I = nullptr) const override;
bool isLegalICmpImmediate(int64_t Imm) const override;
bool isLegalAddImmediate(int64_t Imm) const override;
// Provide custom lowering hooks for some operations.