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add a new Instruction::mayReadFromMemory predicate, make

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Instruction::mayWriteToMemory stronger for invokes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50858 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-05-08 17:16:51 +00:00
parent d7266d484a
commit d96288a2ff
2 changed files with 23 additions and 2 deletions
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21
lib/VMCore/Instruction.cpp
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@@ -219,7 +219,23 @@ bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
return false;
}
/// mayReadFromMemory - Return true if this instruction may read memory.
///
bool Instruction::mayReadFromMemory() const {
switch (getOpcode()) {
default: return false;
case Instruction::Free:
case Instruction::Store:
case Instruction::VAArg:
return true;
case Instruction::Call:
return !cast<CallInst>(this)->doesNotAccessMemory();
case Instruction::Invoke:
return !cast<InvokeInst>(this)->doesNotAccessMemory();
case Instruction::Load:
return true;
}
}
/// mayWriteToMemory - Return true if this instruction may modify memory.
///
@@ -227,12 +243,13 @@ bool Instruction::mayWriteToMemory() const {
switch (getOpcode()) {
default: return false;
case Instruction::Free:
case Instruction::Invoke:
case Instruction::Store:
case Instruction::VAArg:
return true;
case Instruction::Call:
return !cast<CallInst>(this)->onlyReadsMemory();
case Instruction::Invoke:
return !cast<InvokeInst>(this)->onlyReadsMemory();
case Instruction::Load:
return cast<LoadInst>(this)->isVolatile();
}