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[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
This commit is contained in:
David Green 2019-08-16 15:13:37 +00:00
parent 16244fccfe
commit b782e61e47
2 changed files with 21 additions and 6 deletions
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15
llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
View File

@ -186,6 +186,21 @@ int ARMTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
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

12
llvm/test/Analysis/CostModel/ARM/cast.ll
View File

@ -862,14 +862,14 @@ define i32 @load_extends() {
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %r9 = zext i16 %loadi16 to i64
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %r10 = sext i32 %loadi32 to i64
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: %r11 = zext i32 %loadi32 to i64
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v0 = sext <8 x i8> %loadv8i8 to <8 x i16>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v1 = zext <8 x i8> %loadv8i8 to <8 x i16>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v2 = sext <4 x i8> %loadv4i8 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v3 = zext <4 x i8> %loadv4i8 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v0 = sext <8 x i8> %loadv8i8 to <8 x i16>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v1 = zext <8 x i8> %loadv8i8 to <8 x i16>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v2 = sext <4 x i8> %loadv4i8 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v3 = zext <4 x i8> %loadv4i8 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v4 = sext <2 x i8> %loadv2i8 to <2 x i64>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v5 = zext <2 x i8> %loadv2i8 to <2 x i64>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v6 = sext <4 x i16> %loadv4i16 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v7 = zext <4 x i16> %loadv4i16 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v6 = sext <4 x i16> %loadv4i16 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 0 for instruction: %v7 = zext <4 x i16> %loadv4i16 to <4 x i32>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v8 = sext <2 x i16> %loadv2i16 to <2 x i64>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %v9 = zext <2 x i16> %loadv2i16 to <2 x i64>
; CHECK-MVE-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %v10 = sext <2 x i32> %loadv2i32 to <2 x i64>