[PATCH] D101636: [AArch64] Sets the preferred function alignment for Cortex-A53/A55

[Stelios Ioannou via Phabricator via llvm-commits]

stelios-arm created this revision.
stelios-arm added reviewers: dmgreen, SjoerdMeijer, sanwou01, NickGuy, fhahn.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
stelios-arm requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Setting the preferred function alignment to `16` for Cortex A53/A55 improves performance in a wide range of benchmarks. This brings it in line with the 
Cortex-A53/A55 tuning that is used in GCC `(gcc/config/aarch64/aarch64.c)`.


https://reviews.llvm.org/D101636

Files:
  llvm/lib/Target/AArch64/AArch64Subtarget.cpp


Index: llvm/lib/Target/AArch64/AArch64Subtarget.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -89,9 +89,8 @@
   case CortexA35:
     break;
   case CortexA53:
-    PrefFunctionLogAlignment = 3;
-    break;
   case CortexA55:
+    PrefFunctionLogAlignment = 4;
     break;
   case CortexA57:
     MaxInterleaveFactor = 4;


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