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Added documentation. Constant fold terminators.

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llvm-svn: 106
This commit is contained in:
Chris Lattner 2001-06-29 23:56:23 +00:00
parent 96bb2fb5a2
commit 10b250eb4d
1 changed files with 17 additions and 6 deletions
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23
llvm/lib/Transforms/Scalar/SCCP.cpp
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@ -165,10 +165,19 @@ private:
BBWorkList.push_back(BB); // Add the block to the work list!
}
void OperandChangedState(User *U);
void UpdateInstruction(Instruction *I);
};
// UpdateInstruction - Something changed in this instruction... Either an
// operand made a transition, or the instruction is newly executable. Change
// the value type of I to reflect these changes if appropriate.
//
void UpdateInstruction(Instruction *I);
// OperandChangedState - This method is invoked on all of the users of an
// instruction that was just changed state somehow.... Based on this
// information, we need to update the specified user of this instruction.
//
void OperandChangedState(User *U);
};
//===----------------------------------------------------------------------===//
@ -259,9 +268,12 @@ bool SCCP::doSCCP() {
// Hey, we just changed something!
MadeChanges = true;
} else {
++II;
continue; // Skip the ++II at the end of the loop here...
} else if (Inst->isTerminator()) {
MadeChanges |= ConstantFoldTerminator((TerminatorInst*)Inst);
}
++II;
}
// Merge identical constants last: this is important because we may have just
@ -491,7 +503,6 @@ void SCCP::OperandChangedState(User *U) {
}
// DoSparseConditionalConstantProp - Use Sparse Conditional Constant Propogation
// to prove whether a value is constant and whether blocks are used.
//