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Add "hasSideEffects" method to MachineInstrInfo class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45126 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -314,6 +314,15 @@ public:
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isReallyTriviallyReMaterializable(MI);
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}
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/// hasSideEffects - Returns true if the instruction has side effects that are
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/// not captured by any operands of the instruction or other flags.
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bool hasSideEffects(MachineInstr *MI) const {
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const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
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if (!(TID->Flags & M_NEVER_HAS_SIDE_EFFECTS ||
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TID->Flags & M_MAY_HAVE_SIDE_EFFECTS)) return true;
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if (TID->Flags & M_NEVER_HAS_SIDE_EFFECTS) return false;
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return !isReallySideEffectFree(MI); // May have side effects
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}
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protected:
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/// isReallyTriviallyReMaterializable - For instructions with opcodes for
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/// which the M_REMATERIALIZABLE flag is set, this function tests whether the
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@ -329,7 +338,7 @@ protected:
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/// isReallySideEffectFree - If the M_MAY_HAVE_SIDE_EFFECTS flag is set, this
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/// method is called to determine if the specific instance of this
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/// instructions has side effects. This is useful in cases of instructions,
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/// instruction has side effects. This is useful in cases of instructions,
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/// like loads, which generally always have side effects. A load from a
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/// constant pool doesn't have side effects, though. So we need to
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/// differentiate it from the general case.
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