[llvm-commits] [llvm] r156028 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

[Preston Gurd]

Author: pgurd
Date: Wed May  2 17:02:02 2012
New Revision: 156028

URL: http://llvm.org/viewvc/llvm-project?rev=156028&view=rev
Log:

For Intel Atom, use ILP scheduling always, instead of ILP for 64 bit
and Hybrid for 32 bit, since benchmarks show ILP scheduling is better
most of the time.


Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=156028&r1=156027&r2=156028&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Wed May  2 17:02:02 2012
@@ -167,11 +167,11 @@
 
   // For 64-bit since we have so many registers use the ILP scheduler, for
   // 32-bit code use the register pressure specific scheduling.
-  // For 32 bit Atom, use Hybrid (register pressure + latency) scheduling.
-  if (Subtarget->is64Bit())
+  // For Atom, always use ILP scheduling.
+  if (Subtarget->isAtom()) 
+    setSchedulingPreference(Sched::ILP);
+  else if (Subtarget->is64Bit())
     setSchedulingPreference(Sched::ILP);
-  else if (Subtarget->isAtom()) 
-    setSchedulingPreference(Sched::Hybrid);
   else
     setSchedulingPreference(Sched::RegPressure);
   setStackPointerRegisterToSaveRestore(X86StackPtr);