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

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: David Sherwood (david-arm)

<details>
<summary>Changes</summary>

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.

---
Full diff: https://github.com/llvm/llvm-project/pull/77480.diff


2 Files Affected:

- (modified) llvm/lib/Target/AArch64/AArch64LoopIdiomTransform.cpp (+1-1) 
- (modified) llvm/test/Transforms/LoopIdiom/AArch64/byte-compare-index.ll (+3-3) 


``````````diff
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(

``````````

</details>


https://github.com/llvm/llvm-project/pull/77480