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[AArch64] Use 8 bytes as preferred function alignment on Cortex-A53.

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Summary:
This change gives a 0.25% speedup on execution time, a 0.82% improvement
in benchmark scores and a 0.20% increase in binary size on a Cortex-A53.
These numbers are the geomean results on a wide range of benchmarks from
the test-suite and a range of proprietary suites.

Reviewers: t.p.northover, aadg, silviu.baranga, mcrosier, rengolin

Reviewed By: rengolin

Subscribers: grimar, davide, aemerson, rengolin, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D35568

llvm-svn: 309494
This commit is contained in:
Florian Hahn 2017-07-29 20:04:54 +00:00
parent 47cfdaf0df
commit 87ae49923a
2 changed files with 4 additions and 2 deletions
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4
lib/Target/AArch64/AArch64Subtarget.cpp
View File

@ -130,7 +130,9 @@ void AArch64Subtarget::initializeProperties() {
MinVectorRegisterBitWidth = 128;
break;
case CortexA35: break;
case CortexA53: break;
case CortexA53:
PrefFunctionAlignment = 3;
break;
case CortexA72:
PrefFunctionAlignment = 4;
break;

2
test/CodeGen/AArch64/preferred-function-alignment.ll
View File

@ -1,9 +1,9 @@
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=generic < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a35 < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a53 < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cyclone < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=falkor < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=kryo < %s | FileCheck --check-prefixes=ALIGN2,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a53 < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderx < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderxt81 < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderxt83 < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s