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[AArch64] Reduce vector insert/extract cost for Kryo 

Differential Revision: http://reviews.llvm.org/D17379

llvm-svn: 261237
This commit is contained in:
Matthew Simpson 2016-02-18 18:35:45 +00:00
parent 7c8e2c37ba
commit 921ad01a1d
2 changed files with 28 additions and 0 deletions
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2
llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
View File

@ -313,6 +313,8 @@ int AArch64TTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val,
}
// All other insert/extracts cost this much.
if (ST->isKryo())
return 2;
return 3;
}

26
llvm/test/Analysis/CostModel/AArch64/kryo.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: opt < %s -cost-model -analyze -mcpu=kryo | FileCheck %s
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"
; CHECK-LABEL: vectorInstrCost
define void @vectorInstrCost() {
; Vector extracts - extracting the first element should have a zero cost;
; all other elements should have a cost of two.
;
; CHECK: cost of 0 {{.*}} extractelement <2 x i64> undef, i32 0
; CHECK: cost of 2 {{.*}} extractelement <2 x i64> undef, i32 1
%t1 = extractelement <2 x i64> undef, i32 0
%t2 = extractelement <2 x i64> undef, i32 1
; Vector inserts - inserting the first element should have a zero cost; all
; other elements should have a cost of two.
;
; CHECK: cost of 0 {{.*}} insertelement <2 x i64> undef, i64 undef, i32 0
; CHECK: cost of 2 {{.*}} insertelement <2 x i64> undef, i64 undef, i32 1
%t3 = insertelement <2 x i64> undef, i64 undef, i32 0
%t4 = insertelement <2 x i64> undef, i64 undef, i32 1
ret void
}