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Improve the X86 cost model for loads and stores. 

llvm-svn: 170830
This commit is contained in:
Nadav Rotem 2012-12-21 01:33:59 +00:00
parent e7ec558f25
commit 6d4fdd6d2c
4 changed files with 95 additions and 2 deletions
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24
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -17818,6 +17818,30 @@ X86VectorTargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
return VectorTargetTransformImpl::getArithmeticInstrCost(Opcode, Ty);
}
unsigned
X86VectorTargetTransformInfo::getMemoryOpCost(unsigned Opcode, Type *Src,
unsigned Alignment,
unsigned AddressSpace) const {
// Legalize the type.
std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Src);
assert(Opcode == Instruction::Load || Opcode == Instruction::Store &&
"Invalid Opcode");
const X86Subtarget &ST =
TLI->getTargetMachine().getSubtarget<X86Subtarget>();
// Each load/store unit costs 1.
unsigned Cost = LT.first * 1;
// On Sandybridge 256bit load/stores are double pumped
// (but not on Haswell).
if (LT.second.getSizeInBits() > 128 && !ST.hasAVX2())
Cost*=2;
return Cost;
}
unsigned
X86VectorTargetTransformInfo::getVectorInstrCost(unsigned Opcode, Type *Val,
unsigned Index) const {

4
llvm/lib/Target/X86/X86ISelLowering.h
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@ -953,6 +953,10 @@ namespace llvm {
virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
virtual unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
unsigned Alignment,
unsigned AddressSpace) const;
virtual unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
unsigned Index) const;

64
llvm/test/Analysis/CostModel/X86/load_store.ll Normal file
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@ -0,0 +1,64 @@
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
define i32 @stores(i32 %arg) {
;CHECK: cost of 1 {{.*}} store
store i8 undef, i8* undef, align 4
;CHECK: cost of 1 {{.*}} store
store i16 undef, i16* undef, align 4
;CHECK: cost of 1 {{.*}} store
store i32 undef, i32* undef, align 4
;CHECK: cost of 1 {{.*}} store
store i64 undef, i64* undef, align 4
;CHECK: cost of 2 {{.*}} store
store i128 undef, i128* undef, align 4
;CHECK: cost of 1 {{.*}} store
store <4 x i16> undef, <4 x i16>* undef, align 4
;CHECK: cost of 1 {{.*}} store
store <4 x i32> undef, <4 x i32>* undef, align 4
;CHECK: cost of 2 {{.*}} store
store <4 x i64> undef, <4 x i64>* undef, align 4
;CHECK: cost of 1 {{.*}} store
store <8 x i16> undef, <8 x i16>* undef, align 4
;CHECK: cost of 2 {{.*}} store
store <8 x i32> undef, <8 x i32>* undef, align 4
;CHECK: cost of 4 {{.*}} store
store <8 x i64> undef, <8 x i64>* undef, align 4
ret i32 undef
}
define i32 @loads(i32 %arg) {
;CHECK: cost of 1 {{.*}} load
load i8* undef, align 4
;CHECK: cost of 1 {{.*}} load
load i16* undef, align 4
;CHECK: cost of 1 {{.*}} load
load i32* undef, align 4
;CHECK: cost of 1 {{.*}} load
load i64* undef, align 4
;CHECK: cost of 2 {{.*}} load
load i128* undef, align 4
;CHECK: cost of 1 {{.*}} load
load <2 x i32>* undef, align 4
;CHECK: cost of 1 {{.*}} load
load <4 x i32>* undef, align 4
;CHECK: cost of 2 {{.*}} load
load <8 x i32>* undef, align 4
;CHECK: cost of 1 {{.*}} load
load <2 x i64>* undef, align 4
;CHECK: cost of 2 {{.*}} load
load <4 x i64>* undef, align 4
;CHECK: cost of 4 {{.*}} load
load <8 x i64>* undef, align 4
ret i32 undef
}

5
llvm/test/Analysis/CostModel/X86/vectorized-loop.ll
View File

@ -28,16 +28,17 @@ vector.body: ; preds = %for.body.lr.ph, %ve
%4 = getelementptr inbounds i32* %B, i64 %3
;CHECK: cost of 0 {{.*}} bitcast
%5 = bitcast i32* %4 to <8 x i32>*
;CHECK: cost of 1 {{.*}} load
;CHECK: cost of 2 {{.*}} load
%6 = load <8 x i32>* %5, align 4
;CHECK: cost of 4 {{.*}} mul
%7 = mul nsw <8 x i32> %6, <i32 5, i32 5, i32 5, i32 5, i32 5, i32 5, i32 5, i32 5>
%8 = getelementptr inbounds i32* %A, i64 %index
%9 = bitcast i32* %8 to <8 x i32>*
;CHECK: cost of 2 {{.*}} load
%10 = load <8 x i32>* %9, align 4
;CHECK: cost of 4 {{.*}} add
%11 = add nsw <8 x i32> %10, %7
;CHECK: cost of 1 {{.*}} store
;CHECK: cost of 2 {{.*}} store
store <8 x i32> %11, <8 x i32>* %9, align 4
%index.next = add i64 %index, 8
%12 = icmp eq i64 %index.next, %end.idx.rnd.down