diff options
Diffstat (limited to 'llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp index f3da1b83765..b1868cd833c 100644 --- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp +++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp @@ -167,6 +167,27 @@ int ARMTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src, if (!SrcTy.isSimple() || !DstTy.isSimple()) return BaseT::getCastInstrCost(Opcode, Dst, Src); + // The extend of a load is free + if (I && isa<LoadInst>(I->getOperand(0))) { + static const TypeConversionCostTblEntry LoadConversionTbl[] = { + {ISD::SIGN_EXTEND, MVT::i32, MVT::i16, 0}, + {ISD::ZERO_EXTEND, MVT::i32, MVT::i16, 0}, + {ISD::SIGN_EXTEND, MVT::i32, MVT::i8, 0}, + {ISD::ZERO_EXTEND, MVT::i32, MVT::i8, 0}, + {ISD::SIGN_EXTEND, MVT::i16, MVT::i8, 0}, + {ISD::ZERO_EXTEND, MVT::i16, MVT::i8, 0}, + {ISD::SIGN_EXTEND, MVT::i64, MVT::i32, 1}, + {ISD::ZERO_EXTEND, MVT::i64, MVT::i32, 1}, + {ISD::SIGN_EXTEND, MVT::i64, MVT::i16, 1}, + {ISD::ZERO_EXTEND, MVT::i64, MVT::i16, 1}, + {ISD::SIGN_EXTEND, MVT::i64, MVT::i8, 1}, + {ISD::ZERO_EXTEND, MVT::i64, MVT::i8, 1}, + }; + if (const auto *Entry = ConvertCostTableLookup( + LoadConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT())) + return Entry->Cost; + } + // Some arithmetic, load and store operations have specific instructions // to cast up/down their types automatically at no extra cost. // TODO: Get these tables to know at least what the related operations are. |
