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Be much more careful about how we update instructions outside of the loop

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using instructions inside of the loop.  This should fix the MishaTest failure
from last night.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13038 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-18 17:32:39 +00:00
parent df75125ff5
commit 998f44f859
1 changed files with 15 additions and 9 deletions
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24
lib/Transforms/Scalar/LoopUnroll.cpp
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@ -210,16 +210,22 @@ bool LoopUnroll::visitLoop(Loop *L) {
}
// If there was more than one iteration, replace any uses of values computed
// in the loop with values computed during last iteration of the loop.
if (TripCount != 1)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
std::vector<User*> Users(I->use_begin(), I->use_end());
for (unsigned i = 0, e = Users.size(); i != e; ++i) {
Instruction *UI = cast<Instruction>(Users[i]);
if (UI->getParent() != BB && UI->getParent() != NewBlock)
UI->replaceUsesOfWith(I, LastValueMap[I]);
}
// in the loop with values computed during the last iteration of the loop.
if (TripCount != 1) {
std::set<User*> Users;
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
Users.insert(I->use_begin(), I->use_end());
// We don't want to reprocess entries with PHI nodes in them. For this
// reason, we look at each operand of each user exactly once, performing the
// stubstitution exactly once.
for (std::set<User*>::iterator UI = Users.begin(), E = Users.end(); UI != E;
++UI) {
Instruction *I = cast<Instruction>(*UI);
if (I->getParent() != BB && I->getParent() != NewBlock)
RemapInstruction(I, LastValueMap);
}
}
// Now that we cloned the block as many times as we needed, stitch the new
// code into the original block and delete the temporary block.