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ARM cost model: Add costs for vector selects

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Vector selects are cheap on NEON. They get lowered to a vbsl instruction.

radar://13158753

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174631 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer 2013-02-07 16:10:15 +00:00
parent 7db31f1007
commit 66f535a273
2 changed files with 69 additions and 0 deletions
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15
lib/Target/ARM/ARMTargetTransformInfo.cpp
View File

@ -117,6 +117,8 @@ public:
unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
Type *Src) const;
unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy) const;
unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) const;
/// @}
};
@ -311,3 +313,16 @@ unsigned ARMTTI::getVectorInstrCost(unsigned Opcode, Type *ValTy,
return TargetTransformInfo::getVectorInstrCost(Opcode, ValTy, Index);
}
unsigned ARMTTI::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
Type *CondTy) const {
int ISD = TLI->InstructionOpcodeToISD(Opcode);
// On NEON a a vector select gets lowered to vbsl.
if (ST->hasNEON() && ValTy->isVectorTy() && ISD == ISD::SELECT) {
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(ValTy);
return LT.first;
}
return TargetTransformInfo::getCmpSelInstrCost(Opcode, ValTy, CondTy);
}

54
test/Analysis/CostModel/ARM/select.ll Normal file
View File

@ -0,0 +1,54 @@
; RUN: opt < %s -cost-model -analyze -mtriple=thumbv7-apple-ios6.0.0 -mcpu=swift | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
target triple = "thumbv7-apple-ios6.0.0"
; CHECK: casts
define void @casts() {
; Scalar values
; CHECK: cost of 1 {{.*}} select
%v1 = select i1 undef, i8 undef, i8 undef
; CHECK: cost of 1 {{.*}} select
%v2 = select i1 undef, i16 undef, i16 undef
; CHECK: cost of 1 {{.*}} select
%v3 = select i1 undef, i32 undef, i32 undef
; CHECK: cost of 2 {{.*}} select
%v4 = select i1 undef, i64 undef, i64 undef
; CHECK: cost of 1 {{.*}} select
%v5 = select i1 undef, float undef, float undef
; CHECK: cost of 1 {{.*}} select
%v6 = select i1 undef, double undef, double undef
; Vector values
; CHECK: cost of 1 {{.*}} select
%v7 = select <2 x i1> undef, <2 x i8> undef, <2 x i8> undef
; CHECK: cost of 1 {{.*}} select
%v8 = select <4 x i1> undef, <4 x i8> undef, <4 x i8> undef
; CHECK: cost of 1 {{.*}} select
%v9 = select <8 x i1> undef, <8 x i8> undef, <8 x i8> undef
; CHECK: cost of 1 {{.*}} select
%v10 = select <16 x i1> undef, <16 x i8> undef, <16 x i8> undef
; CHECK: cost of 1 {{.*}} select
%v11 = select <2 x i1> undef, <2 x i16> undef, <2 x i16> undef
; CHECK: cost of 1 {{.*}} select
%v12 = select <4 x i1> undef, <4 x i16> undef, <4 x i16> undef
; CHECK: cost of 1 {{.*}} select
%v13 = select <8 x i1> undef, <8 x i16> undef, <8 x i16> undef
; CHECK: cost of 1 {{.*}} select
%v14 = select <2 x i1> undef, <2 x i32> undef, <2 x i32> undef
; CHECK: cost of 1 {{.*}} select
%v15 = select <4 x i1> undef, <4 x i32> undef, <4 x i32> undef
; CHECK: cost of 1 {{.*}} select
%v16 = select <2 x i1> undef, <2 x i64> undef, <2 x i64> undef
; CHECK: cost of 1 {{.*}} select
%v17 = select <2 x i1> undef, <2 x float> undef, <2 x float> undef
; CHECK: cost of 1 {{.*}} select
%v18 = select <4 x i1> undef, <4 x float> undef, <4 x float> undef
; CHECK: cost of 1 {{.*}} select
%v19 = select <2 x i1> undef, <2 x double> undef, <2 x double> undef
ret void
}