Author: lattner
Date: Sat Jan 5 00:10:42 2008
New Revision: 45623
URL: http://llvm.org/viewvc/llvm-project?rev=45623&view=rev
Log:
enable sinking and licm of loads from the argument area. I'd like to enable
this
for remat, but can't due to an RA bug.
Modified:
llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.cpp?rev=45623&r1=45622&r2=45623&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86InstrInfo.cpp Sat Jan 5 00:10:42 2008
@@ -141,6 +141,18 @@
MI->getOperand(2).getImm() == 1 &&
MI->getOperand(3).getReg() == 0)
return true;
+
+ // If this is a load from a fixed argument slot, we know the value is
+ // invariant across the whole function, because we don't redefine argument
+ // values.
+#if 0
+ // FIXME: This is disabled due to a remat bug. rdar://5671644
+ MachineFunction *MF = MI->getParent()->getParent();
+ if (MI->getOperand(1).isFI() &&
+ MF->getFrameInfo()->isFixedObjectIndex(MI->getOperand(1).getIndex()))
+ return true;
+#endif
+
return false;
}
// All other instructions marked M_REMATERIALIZABLE are always trivially
@@ -188,6 +200,15 @@
MI->getOperand(2).getImm() == 1 &&
MI->getOperand(3).getReg() == 0)
return true;
+
+ // If this is a load from a fixed argument slot, we know the value is
+ // invariant across the whole function, because we don't redefine argument
+ // values.
+ MachineFunction *MF = MI->getParent()->getParent();
+ if (MI->getOperand(1).isFI() &&
+ MF->getFrameInfo()->isFixedObjectIndex(MI->getOperand(1).getIndex()))
+ return true;
+
return false;
}
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