[llvm] [AArch64] Set the cache line size to 64 for the V2 and V3. (PR #148213)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-aarch64

Author: Sjoerd Meijer (sjoerdmeijer)

<details>
<summary>Changes</summary>

This sets the cache line size to 64 for the Neoverse V2 and V3.  I've tested this with loop-interchange: it doesn't result in extra compile-times, but it does enable a lot more interchange.

I've also set this for V3, have not tested this, but looks like the sensible thing to do, but am happy to remove this.

---
Full diff: https://github.com/llvm/llvm-project/pull/148213.diff


1 Files Affected:

- (modified) llvm/lib/Target/AArch64/AArch64Subtarget.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
index 68ed10570a52f..4ac93526295aa 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -270,6 +270,7 @@ void AArch64Subtarget::initializeProperties(bool HasMinSize) {
     break;
   case NeoverseV2:
   case NeoverseV3:
+    CacheLineSize = 64;
     EpilogueVectorizationMinVF = 8;
     MaxInterleaveFactor = 4;
     ScatterOverhead = 13;

``````````

</details>


https://github.com/llvm/llvm-project/pull/148213