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| author | Florian Hahn <florian.hahn@arm.com> | 2017-07-07 10:43:01 +0000 |
|---|---|---|
| committer | Florian Hahn <florian.hahn@arm.com> | 2017-07-07 10:43:01 +0000 |
| commit | d4550baf3b6dceceaa13e91563b053538e3697bb (patch) | |
| tree | 94a3582b1c4c842caee80edf90d38ca8864b1566 | |
| parent | b249c9bcf500ac413d62daa928e8bb5e9ddebe21 (diff) | |
| download | bcm5719-llvm-d4550baf3b6dceceaa13e91563b053538e3697bb.tar.gz bcm5719-llvm-d4550baf3b6dceceaa13e91563b053538e3697bb.zip | |
[AArch64] Use 16 bytes as preferred function alignment on Cortex-A57.
Summary:
This change gives a 0.89% speed on execution time, a 0.94% improvement
in benchmark scores and a 0.62% increase in binary size on a Cortex-A57.
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-A57 recommends 16 byte
branch alignment.
Reviewers: t.p.northover, mcrosier, javed.absar, kristof.beyls, sbaranga
Reviewed By: kristof.beyls
Subscribers: aemerson, rengolin, llvm-commits
Differential Revision: https://reviews.llvm.org/D34954
llvm-svn: 307389
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64Subtarget.cpp | 1 | ||||
| -rw-r--r-- | llvm/test/CodeGen/AArch64/preferred-function-alignment.ll | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp index df620cc2934..a3238cf3b60 100644 --- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp +++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp @@ -81,6 +81,7 @@ void AArch64Subtarget::initializeProperties() { break; case CortexA57: MaxInterleaveFactor = 4; + PrefFunctionAlignment = 4; break; case ExynosM1: MaxInterleaveFactor = 4; diff --git a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll index 3b3af88d34b..88e6f5dd01c 100644 --- a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll +++ b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll @@ -1,7 +1,6 @@ ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=generic < %s | FileCheck --check-prefix=ALIGN2 %s ; 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-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 @@ -11,6 +10,7 @@ ; 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-a57 < %s | FileCheck --check-prefix=ALIGN4 %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 |
