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Comment UpdateSSA after reviewing.

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Swift SVN r25397
This commit is contained in:
Andrew Trick
2015-02-19 19:26:46 +00:00
parent 2e07b13097
commit 7adbae859d
1 changed files with 3 additions and 2 deletions
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5
lib/SILPasses/LoopRotate.cpp
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@@ -147,8 +147,9 @@ updateSSAForUseOfInst(SILSSAUpdater &Updater,
// For each use of a specific result value of the instruction.
for (unsigned i = 0, e = Inst->getNumTypes(); i != e; ++i) {
SILValue Res(Inst, i);
// For block arguments the MappedValue stores the result index to use (see
// also comment in mapOperands).
// For block arguments, MappedValue is already indexed to indicate the
// single result value that feeds the argument. In this case, i==0 because
// SILArgument only produces one value.
SILValue MappedRes =
isa<SILArgument>(Inst) ? MappedValue : SILValue(MappedInst, i);
assert(Res.getType() == MappedRes.getType() && "The types must match");