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[AArch64] Use 16 bytes as preferred function alignment on Cortex-A72.

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Summary:
This change gives a 0.34% speed on execution time, a 0.61% improvement
in benchmark scores and a 0.57% increase in binary size on a Cortex-A72.
These numbers are the geomean results on a wide range of benchmarks from
the test-suite, SPEC2000, SPEC2006 and a range of proprietary suites.

The software optimization guide for the Cortex-A72 recommends 16 byte
branch alignment.


Reviewers: t.p.northover, kristof.beyls, rengolin, sbaranga, mcrosier, javed.absar

Reviewed By: kristof.beyls

Subscribers: llvm-commits, aemerson

Differential Revision: https://reviews.llvm.org/D34961

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307380 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Florian Hahn
2017-07-07 10:15:49 +00:00
parent 4a533c58e1
commit d04ee305d8
2 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/AArch64/AArch64Subtarget.cpp
+3 -1
View File
@@ -130,7 +130,9 @@ void AArch64Subtarget::initializeProperties() {
break;
case CortexA35: break;
case CortexA53: break;
case CortexA72: break;
case CortexA72:
PrefFunctionAlignment = 4;
break;
case CortexA73: break;
case Others: break;
}
test/CodeGen/AArch64/preferred-function-alignment.ll
+1 -1
View File
@@ -2,7 +2,6 @@
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a35 < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a53 < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a57 < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a72 < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a73 < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cyclone < %s | FileCheck --check-prefix=ALIGN2 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=falkor < %s | FileCheck --check-prefix=ALIGN2 %s
@@ -12,6 +11,7 @@
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderxt83 < %s | FileCheck --check-prefix=ALIGN3 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderxt88 < %s | FileCheck --check-prefix=ALIGN3 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=thunderx2t99 < %s | FileCheck --check-prefix=ALIGN3 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a72 < %s | FileCheck --check-prefix=ALIGN4 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=exynos-m1 < %s | FileCheck --check-prefix=ALIGN4 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=exynos-m2 < %s | FileCheck --check-prefix=ALIGN4 %s
; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=exynos-m3 < %s | FileCheck --check-prefix=ALIGN4 %s