From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 25 Mar 2010 20:48:50 +0000 (+0000)
Subject: ARM cortex-a8 doesn't do vmla/vmls well. disable them by default for that cpu
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=65cef00142c9a187707c56a293ae794765f7463b;p=oota-llvm.git

ARM cortex-a8 doesn't do vmla/vmls well. disable them by default for that cpu

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99549 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 6b4438d4c86..8df59e4789e 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -127,6 +127,12 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
     // operations with NEON instructions.
     if (UseNEONFP.getPosition() == 0)
       UseNEONForSinglePrecisionFP = true;
+    // The VFP vlma and vlms instructions don't play nicely with others;
+    // disable them.
+    // FIXME: This may be true for other variants as well. Get benchmark
+    // numbers and add them if determined that's the case.
+    if (UseVMLxInstructions.getPosition() == 0)
+      UseVMLx = false;
   }
 }