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[AArch64] Disable narrow load merge by default

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Summary:
As this optimization converts two loads into one load with two shift instructions,
it could potentially hurt performance if a loop is arithmetic operation intensive.

Reviewers: t.p.northover, mcrosier, jmolloy

Subscribers: evandro, jmolloy, aemerson, rengolin, mcrosier, llvm-commits

Differential Revision: http://reviews.llvm.org/D20172

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270251 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jun Bum Lim 2016-05-20 18:45:49 +00:00
parent 04be7e88ef
commit 2d7f9c2715
2 changed files with 4 additions and 4 deletions
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2
lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
View File

@ -52,7 +52,7 @@ static cl::opt<unsigned> UpdateLimit("aarch64-update-scan-limit", cl::init(100),
cl::Hidden);
static cl::opt<bool> EnableNarrowLdMerge("enable-narrow-ld-merge", cl::Hidden,
cl::init(true),
cl::init(false),
cl::desc("Enable narrow load merge"));
namespace llvm {

6
test/CodeGen/AArch64/arm64-narrow-ldst-merge.ll
View File

@ -1,6 +1,6 @@
; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=LE
; RUN: llc < %s -mtriple aarch64_be--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=BE
; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=kryo -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=LE
; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=cortex-a57 -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=LE
; RUN: llc < %s -mtriple aarch64_be--none-eabi -mcpu=cortex-a57 -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=BE
; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=kryo -verify-machineinstrs -enable-narrow-ld-merge=true | FileCheck %s --check-prefix=CHECK --check-prefix=LE
; CHECK-LABEL: Ldrh_merge
; CHECK-NOT: ldrh