[llvm] [AArch64] Enable AArch64 loop idiom transform pass (PR #77480)

[David Sherwood via llvm-commits]

https://github.com/david-arm created https://github.com/llvm/llvm-project/pull/77480

Following on from

https://github.com/llvm/llvm-project/pull/72273

which added the new AArch64 loop idiom transformation pass, this patch enables the pass by default for AArch64.

>From bfebc03621bbbb59b8bc5e915e3798122b2e4235 Mon Sep 17 00:00:00 2001
From: David Sherwood <david.sherwood at arm.com>
Date: Tue, 9 Jan 2024 14:29:48 +0000
Subject: [PATCH] [AArch64] Enable AArch64 loop idiom transform pass

Following on from

https://github.com/llvm/llvm-project/pull/72273

which added the new AArch64 loop idiom transformation pass,
this patch enables the pass by default for AArch64.
---
 llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp       | 2 +-
 .../test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp b/llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp
index 6fcd9c290e9c5c..6c6cd120b03544 100644
--- a/llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp
+++ b/llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp
@@ -53,7 +53,7 @@ using namespace PatternMatch;
 #define DEBUG_TYPE "aarch64-loop-idiom-transform"
 
 static cl::opt<bool>
-    DisableAll("disable-aarch64-lit-all", cl::Hidden, cl::init(true),
+    DisableAll("disable-aarch64-lit-all", cl::Hidden, cl::init(false),
                cl::desc("Disable AArch64 Loop Idiom Transform Pass."));
 
 static cl::opt<bool> DisableByteCmp(
diff --git a/llvm/test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll b/llvm/test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll
index 8f011e2d00a0f7..1767f2c0bd972e 100644
--- a/llvm/test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll
+++ b/llvm/test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll
@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
-; RUN: opt -aarch64-lit -disable-aarch64-lit-all=false -aarch64-lit-verify -verify-dom-info -mtriple aarch64-unknown-linux-gnu -mattr=+sve -S < %s | FileCheck %s
-; RUN: opt -aarch64-lit -disable-aarch64-lit-all=false -simplifycfg -mtriple aarch64-unknown-linux-gnu -mattr=+sve -S < %s | FileCheck %s --check-prefix=LOOP-DEL
-; RUN: opt -aarch64-lit -disable-aarch64-lit-all=false -mtriple aarch64-unknown-linux-gnu -S < %s | FileCheck %s --check-prefix=NO-TRANSFORM
+; RUN: opt -aarch64-lit -aarch64-lit-verify -verify-dom-info -mtriple aarch64-unknown-linux-gnu -mattr=+sve -S < %s | FileCheck %s
+; RUN: opt -aarch64-lit -simplifycfg -mtriple aarch64-unknown-linux-gnu -mattr=+sve -S < %s | FileCheck %s --check-prefix=LOOP-DEL
+; RUN: opt -aarch64-lit -mtriple aarch64-unknown-linux-gnu -S < %s | FileCheck %s --check-prefix=NO-TRANSFORM
 
 define i32 @compare_bytes_simple(ptr %a, ptr %b, i32 %len, i32 %extra, i32 %n) {
 ; CHECK-LABEL: define i32 @compare_bytes_simple(