Author: void
Date: Mon Dec 17 15:53:30 2007
New Revision: 45126
URL: http://llvm.org/viewvc/llvm-project?rev=45126&view=rev
Log:
Add "hasSideEffects" method to MachineInstrInfo class.
Modified:
llvm/trunk/include/llvm/Target/TargetInstrInfo.h
Modified: llvm/trunk/include/llvm/Target/TargetInstrInfo.h
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetInstrInfo.h?rev=45126&r1=45125&r2=45126&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetInstrInfo.h (original)
+++ llvm/trunk/include/llvm/Target/TargetInstrInfo.h Mon Dec 17 15:53:30 2007
@@ -314,6 +314,15 @@
isReallyTriviallyReMaterializable(MI);
}
+ /// hasSideEffects - Returns true if the instruction has side effects that
are
+ /// not captured by any operands of the instruction or other flags.
+ bool hasSideEffects(MachineInstr *MI) const {
+ const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
+ if (!(TID->Flags & M_NEVER_HAS_SIDE_EFFECTS ||
+ TID->Flags & M_MAY_HAVE_SIDE_EFFECTS)) return true;
+ if (TID->Flags & M_NEVER_HAS_SIDE_EFFECTS) return false;
+ return !isReallySideEffectFree(MI); // May have side effects
+ }
protected:
/// isReallyTriviallyReMaterializable - For instructions with opcodes for
/// which the M_REMATERIALIZABLE flag is set, this function tests whether the
@@ -329,7 +338,7 @@
/// isReallySideEffectFree - If the M_MAY_HAVE_SIDE_EFFECTS flag is set, this
/// method is called to determine if the specific instance of this
- /// instructions has side effects. This is useful in cases of instructions,
+ /// instruction has side effects. This is useful in cases of instructions,
/// like loads, which generally always have side effects. A load from a
/// constant pool doesn't have side effects, though. So we need to
/// differentiate it from the general case.
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