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[AArch64] Set pref. func. align to 8 bytes on Neoverse E1 & Cortex-A65

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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
This commit is contained in:
Pablo Barrio 2019-08-09 11:05:15 +00:00
parent 8921d6b9ca
commit 96fed620d2
2 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Target/AArch64/AArch64Subtarget.cpp
View File

@ -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;

3
test/CodeGen/AArch64/preferred-function-alignment.ll
View File

@ -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