From: Preston Gurd <preston.gurd@intel.com>
Date: Wed, 2 May 2012 22:02:02 +0000 (+0000)
Subject: For Intel Atom, use ILP scheduling always, instead of ILP for 64 bit
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c0f0a93936a23a0935aa946a65095388b50c087f;p=oota-llvm.git

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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156028 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index bbe280851c2..bdbdaf5a3e7 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -167,11 +167,11 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
 
   // 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);