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Switch from an O(n) method to an O(1) method for changing non-constant

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operands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55127 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-08-21 17:31:45 +00:00
parent 5cc101ec89
commit b6135a054d
1 changed files with 5 additions and 4 deletions
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9
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -237,17 +237,18 @@ void BitcodeReaderValueList::ResolveConstantForwardRefs() {
// new value. If they reference more than one placeholder, update them all
// at once.
while (!Placeholder->use_empty()) {
User *U = Placeholder->use_back();
Value::use_iterator UI = Placeholder->use_begin();
// If the using object isn't uniqued, just update the operands. This
// handles instructions and initializers for global variables.
if (!isa<Constant>(U) || isa<GlobalValue>(U)) {
U->replaceUsesOfWith(Placeholder, RealVal);
if (!isa<Constant>(*UI) || isa<GlobalValue>(*UI)) {
UI.getUse().set(RealVal);
continue;
}
// Otherwise, we have a constant that uses the placeholder. Replace that
// constant with a new constant that has *all* placeholder uses updated.
Constant *UserC = cast<Constant>(U);
Constant *UserC = cast<Constant>(*UI);
for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end();
I != E; ++I) {
Value *NewOp;