Author: lattner
Date: Sat Jan 5 23:43:21 2008
New Revision: 45651
URL: http://llvm.org/viewvc/llvm-project?rev=45651&view=rev
Log:
describe isStore and simplify the implementation of hasUnmodelledSideEffects.
No functionality change.
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=45651&r1=45650&r2=45651&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetInstrInfo.h (original)
+++ llvm/trunk/include/llvm/Target/TargetInstrInfo.h Sat Jan 5 23:43:21 2008
@@ -49,7 +49,13 @@
const unsigned M_BARRIER_FLAG = 1 << 3;
const unsigned M_DELAY_SLOT_FLAG = 1 << 4;
const unsigned M_LOAD_FLAG = 1 << 5;
+
+/// M_STORE_FLAG - This flag is set to any instruction that could possibly
+/// modify memory. Instructions with this flag set are not necessarily simple
+/// store instructions, they may store a modified value based on their
operands,
+/// or may not actually modify anything, for example.
const unsigned M_STORE_FLAG = 1 << 6;
+
const unsigned M_INDIRECT_FLAG = 1 << 7;
const unsigned M_IMPLICIT_DEF_FLAG = 1 << 8;
@@ -276,6 +282,11 @@
bool isLoad(MachineOpCode Opcode) const {
return get(Opcode).Flags & M_LOAD_FLAG;
}
+
+ /// isStore - Return true if this instruction could possibly modify memory.
+ /// Instructions with this flag set are not necessarily simple store
+ /// instructions, they may store a modified value based on their operands, or
+ /// may not actually modify anything, for example.
bool isStore(MachineOpCode Opcode) const {
return get(Opcode).Flags & M_STORE_FLAG;
}
@@ -322,9 +333,8 @@
/// flags.
bool hasUnmodelledSideEffects(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;
+ if (!(TID->Flags & M_MAY_HAVE_SIDE_EFFECTS)) return true;
return !isReallySideEffectFree(MI); // May have side effects
}
protected:
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