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describe isStore and simplify the implementation of hasUnmodelledSideEffects.

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No functionality change. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45651 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-06 05:43:21 +00:00
parent e67bde5bb1
commit 8ed9c1a6d9
1 changed files with 12 additions and 2 deletions
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14
include/llvm/Target/TargetInstrInfo.h
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@ -49,7 +49,13 @@ const unsigned M_RET_FLAG = 1 << 2;
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 @@ public:
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 @@ public:
/// 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: