[ARM] MVE sext of a load is free
MVE also has some sext of loads, which will be free just as scalar
instructions are.
Differential Revision: https://reviews.llvm.org/D66008
llvm-svn: 369118
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
index a8d04ee..e94b9bd 100644
--- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -186,6 +186,21 @@
if (const auto *Entry = ConvertCostTableLookup(
LoadConversionTbl, ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT()))
return Entry->Cost;
+
+ static const TypeConversionCostTblEntry MVELoadConversionTbl[] = {
+ {ISD::SIGN_EXTEND, MVT::v4i32, MVT::v4i16, 0},
+ {ISD::ZERO_EXTEND, MVT::v4i32, MVT::v4i16, 0},
+ {ISD::SIGN_EXTEND, MVT::v4i32, MVT::v4i8, 0},
+ {ISD::ZERO_EXTEND, MVT::v4i32, MVT::v4i8, 0},
+ {ISD::SIGN_EXTEND, MVT::v8i16, MVT::v8i8, 0},
+ {ISD::ZERO_EXTEND, MVT::v8i16, MVT::v8i8, 0},
+ };
+ if (SrcTy.isVector() && ST->hasMVEIntegerOps()) {
+ if (const auto *Entry =
+ ConvertCostTableLookup(MVELoadConversionTbl, ISD,
+ DstTy.getSimpleVT(), SrcTy.getSimpleVT()))
+ return Entry->Cost;
+ }
}
// Some arithmetic, load and store operations have specific instructions