Hi Chris,
> /// RemapNode - If the specified value was already legalized to another
> value,
> /// replace it by that value.
> void DAGTypeLegalizer::RemapNode(SDOperand &N) {
> - DenseMap<SDOperand, SDOperand>::iterator I = ReplacedNodes.find(N);
> - if (I != ReplacedNodes.end()) {
> - RemapNode(I->second);
> + for (DenseMap<SDOperand, SDOperand>::iterator I = ReplacedNodes.find(N);
> + I != ReplacedNodes.end(); I = ReplacedNodes.find(N))
> N = I->second;
> - }
> }
in the original version this updated the map too (or at least it was supposed
to). For example, suppose we remap N and the map contained:
N -> A
A -> B
B -> C
then afterwards we would get N = C, but also the map would be modified to:
N -> C
A -> C
B -> C
This was supposed to speed up later lookups.
> + if (SDNode *P = TLI.ExpandOperationResult(N, DAG)) {
> + // Everything that once used N now uses P. P had better not require
> + // custom expansion.
How about an assertion that it doesn't require custom expansion?
Ciao,
Duncan.
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