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| author | Pablo Barrio <pablo.barrio@arm.com> | 2019-08-09 11:05:15 +0000 |
|---|---|---|
| committer | Pablo Barrio <pablo.barrio@arm.com> | 2019-08-09 11:05:15 +0000 |
| commit | 3cdd586be28f7dfe400f1186d1e3d8c31c625fb8 (patch) | |
| tree | 424dec3a9ed7d693e5bc844802dc763e75ba36f5 | |
| parent | 5640860171e400fe4eb01816dc2a1a7d12afd1e2 (diff) | |
| download | bcm5719-llvm-3cdd586be28f7dfe400f1186d1e3d8c31c625fb8.tar.gz bcm5719-llvm-3cdd586be28f7dfe400f1186d1e3d8c31c625fb8.zip | |
[AArch64] Set pref. func. align to 8 bytes on Neoverse E1 & Cortex-A65
Summary:
The Arm Neoverse E1 and Cortex-A65 Software Optimization Guide [1][2],
Section "4.7 Branch instruction alignment" state:
"It is preferable for branch targets, including subroutine entry points,
to be placed on aligned 64-bit boundaries to maximize instruction fetch
efficiency."
This patch sets the preferred function alignment on Neoverse E1 and
Cortex-A65 to 2^3=8B. This was already the case in some Cortex-A CPUs
such as Cortex-A53.
[1] https://developer.arm.com/docs/swog466751/latest/arm-neoversetm-e1-core-software-optimization-guide
[2] https://developer.arm.com/docs/swog010045/latest/arm-cortex-a65-core-software-optimization-guide
Reviewers: dmgreen, fhahn, samparker
Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65937
llvm-svn: 368431
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64Subtarget.cpp | 2 | ||||
| -rw-r--r-- | llvm/test/CodeGen/AArch64/preferred-function-alignment.ll | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp index 9103287bf8c..3c68c574501 100644 --- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp +++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp @@ -80,6 +80,7 @@ void AArch64Subtarget::initializeProperties() { PrefFunctionAlignment = 4; break; case CortexA65: + PrefFunctionAlignment = 3; break; case CortexA72: case CortexA73: @@ -125,6 +126,7 @@ void AArch64Subtarget::initializeProperties() { MinVectorRegisterBitWidth = 128; break; case NeoverseE1: + PrefFunctionAlignment = 3; break; case NeoverseN1: PrefFunctionAlignment = 4; diff --git a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll index ac9e3bbd6c7..aeb38008620 100644 --- a/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll +++ b/llvm/test/CodeGen/AArch64/preferred-function-alignment.ll @@ -2,6 +2,8 @@ ; 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=ALIGN3,CHECK %s ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a57 < %s | FileCheck --check-prefixes=ALIGN4,CHECK %s +; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a65 < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s +; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a65ae < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a72 < %s | FileCheck --check-prefixes=ALIGN4,CHECK %s ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a73 < %s | FileCheck --check-prefixes=ALIGN4,CHECK %s ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=cortex-a75 < %s | FileCheck --check-prefixes=ALIGN4,CHECK %s @@ -9,6 +11,7 @@ ; 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=neoverse-e1 < %s | FileCheck --check-prefixes=ALIGN3,CHECK %s ; RUN: llc -mtriple=aarch64-unknown-linux -mcpu=neoverse-n1 < %s | FileCheck --check-prefixes=ALIGN4,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 |
