From: Hao Liu <Hao.Liu@arm.com>
Date: Wed, 19 Nov 2014 06:48:56 +0000 (+0000)
Subject: [AArch64] Disable useAA for Cortex-A57.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2aa06a989dfef2950ab45da80dd9c1adadd9f9a2;p=platform%2Fupstream%2Fllvm.git

[AArch64] Disable useAA for Cortex-A57.
Using AA during CodeGen is very useful for in-order cores. It is less useful for ooo cores. Also I find
enabling useAA for Cortex-A57 may generate worse code for some test cases. If useAA in codegen is improved
and benefical for ooo cores, we can enable it again.

llvm-svn: 222333
---

diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.h b/llvm/lib/Target/AArch64/AArch64Subtarget.h
index 06bd369..e2740f1 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.h
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.h
@@ -115,7 +115,7 @@ public:
   bool isCortexA57() const { return CPUString == "cortex-a57"; }
   bool isCortexA53() const { return CPUString == "cortex-a53"; }
 
-  bool useAA() const override { return isCortexA53() || isCortexA57(); }
+  bool useAA() const override { return isCortexA53(); }
 
   /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
   /// that still makes it profitable to inline the call.