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| author | Florian Hahn <florian.hahn@arm.com> | 2017-07-07 10:15:49 +0000 |
|---|---|---|
| committer | Florian Hahn <florian.hahn@arm.com> | 2017-07-07 10:15:49 +0000 |
| commit | e3666ec9d6fc5debb641b073d16f1940242bf6cd (patch) | |
| tree | 58ef6c261853587daf5fea9cbc644b48488a8a76 | |
| parent | 91dafe09b05524d7b102b00a1e82dacbd68f0af7 (diff) | |
| download | bcm5719-llvm-e3666ec9d6fc5debb641b073d16f1940242bf6cd.tar.gz bcm5719-llvm-e3666ec9d6fc5debb641b073d16f1940242bf6cd.zip | |
[AArch64] Use 16 bytes as preferred function alignment on Cortex-A72.
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
llvm-svn: 307380
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64Subtarget.cpp | 4 | ||||
| -rw-r--r-- | llvm/test/CodeGen/AArch64/preferred-function-alignment.ll | 2 |
2 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp index a9a9d5ce842..df620cc2934 100644 --- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp +++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp @@ -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; } diff --git a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll index 0a86f11f116..3b3af88d34b 100644 --- a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll +++ b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll @@ -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 |
