[llvm-commits] [llvm] r99549 - /llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp

[Jim Grosbach]

Author: grosbach
Date: Thu Mar 25 15:48:50 2010
New Revision: 99549

URL: http://llvm.org/viewvc/llvm-project?rev=99549&view=rev
Log:
ARM cortex-a8 doesn't do vmla/vmls well. disable them by default for that cpu

Modified:
    llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp?rev=99549&r1=99548&r2=99549&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMSubtarget.cpp Thu Mar 25 15:48:50 2010
@@ -127,6 +127,12 @@
     // 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;
   }
 }