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Cost Model: add tables for some avx type-conversion hacks.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-11-06 19:33:53 +00:00
parent a082892fb7
commit b042868c01
4 changed files with 94 additions and 3 deletions
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60
lib/Target/X86/X86ISelLowering.cpp
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@ -17526,6 +17526,23 @@ int FindInTable(const X86CostTblEntry *Tbl, unsigned len, int ISD, MVT Ty) {
return -1;
}
struct X86TypeConversionCostTblEntry {
int ISD;
MVT Dst;
MVT Src;
unsigned Cost;
};
int FindInConvertTable(const X86TypeConversionCostTblEntry *Tbl, unsigned len,
int ISD, MVT Dst, MVT Src) {
for (unsigned int i = 0; i < len; ++i)
if (Tbl[i].ISD == ISD && Tbl[i].Src == Src && Tbl[i].Dst == Dst)
return i;
// Could not find an entry.
return -1;
}
unsigned
X86VectorTargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
Type *Ty) const {
@ -17535,8 +17552,7 @@ X86VectorTargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
int ISD = InstructionOpcodeToISD(Opcode);
assert(ISD && "Invalid opcode");
const X86Subtarget &ST =
TLI->getTargetMachine().getSubtarget<X86Subtarget>();
const X86Subtarget &ST = TLI->getTargetMachine().getSubtarget<X86Subtarget>();
static const X86CostTblEntry AVX1CostTable[] = {
// We don't have to scalarize unsupported ops. We can issue two half-sized
@ -17647,5 +17663,45 @@ unsigned X86VectorTargetTransformInfo::getCmpSelInstrCost(unsigned Opcode,
return VectorTargetTransformImpl::getCmpSelInstrCost(Opcode, ValTy, CondTy);
}
unsigned X86VectorTargetTransformInfo::getCastInstrCost(unsigned Opcode,
Type *Dst,
Type *Src) const {
int ISD = InstructionOpcodeToISD(Opcode);
assert(ISD && "Invalid opcode");
EVT SrcTy = TLI->getValueType(Src);
EVT DstTy = TLI->getValueType(Dst);
if (!SrcTy.isSimple() || !DstTy.isSimple())
return VectorTargetTransformImpl::getCastInstrCost(Opcode, Dst, Src);
const X86Subtarget &ST = TLI->getTargetMachine().getSubtarget<X86Subtarget>();
static const X86TypeConversionCostTblEntry AVXConversionTbl[] = {
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i16, 1 },
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i16, 1 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i32, 1 },
{ ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i32, 1 },
{ ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 1 },
{ ISD::TRUNCATE, MVT::v8i16, MVT::v8i32, 1 },
{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i8, 1 },
{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i8, 1 },
{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i8, 1 },
{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i8, 1 },
{ ISD::FP_TO_SINT, MVT::v8i8, MVT::v8f32, 1 },
{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 },
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 6 },
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 9 },
};
if (ST.hasAVX()) {
int Idx = FindInConvertTable(AVXConversionTbl,
array_lengthof(AVXConversionTbl),
ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT());
if (Idx != -1)
return AVXConversionTbl[Idx].Cost;
}
return VectorTargetTransformImpl::getCastInstrCost(Opcode, Dst, Src);
}

3
lib/Target/X86/X86ISelLowering.h
View File

@ -960,6 +960,9 @@ namespace llvm {
unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
Type *CondTy) const;
virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
Type *Src) const;
};
}

32
test/Analysis/CostModel/X86/cast.ll
View File

@ -32,3 +32,35 @@ define i32 @add(i32 %arg) {
ret i32 undef
}
define i32 @zext_sext(<8 x i1> %in) {
;CHECK: cost of 6 {{.*}} zext
%Z = zext <8 x i1> %in to <8 x i32>
;CHECK: cost of 9 {{.*}} sext
%S = sext <8 x i1> %in to <8 x i32>
;CHECK: cost of 1 {{.*}} sext
%A = sext <8 x i16> undef to <8 x i32>
;CHECK: cost of 1 {{.*}} zext
%B = zext <8 x i16> undef to <8 x i32>
;CHECK: cost of 1 {{.*}} sext
%C = sext <4 x i32> undef to <4 x i64>
;CHECK: cost of 1 {{.*}} zext
%D = zext <4 x i32> undef to <4 x i64>
;CHECK: cost of 1 {{.*}} trunc
%E = trunc <4 x i64> undef to <4 x i32>
;CHECK: cost of 1 {{.*}} trunc
%F = trunc <8 x i32> undef to <8 x i16>
ret i32 undef
}
define i32 @masks(<8 x i1> %in) {
;CHECK: cost of 6 {{.*}} zext
%Z = zext <8 x i1> %in to <8 x i32>
;CHECK: cost of 9 {{.*}} sext
%S = sext <8 x i1> %in to <8 x i32>
ret i32 undef
}

2
test/Transforms/LoopVectorize/X86/cost-model.ll
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@ -9,7 +9,7 @@ target triple = "x86_64-apple-macosx10.8.0"
@a = common global [2048 x i32] zeroinitializer, align 16
;CHECK: cost_model_1
;CHECK-NOT: <4 x i32>
;CHECK: <4 x i32>
;CHECK: ret void
define void @cost_model_1() nounwind uwtable noinline ssp {
entry: