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UseListOrder: Guarantee that shuffles change use-list order

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Change shuffleUseLists() always to change use-list order by rejecting
orders that have no changes.

This is part of PR5680.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214584 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2014-08-01 22:50:04 +00:00
parent 1526278443
commit 7df1db57b3
1 changed files with 12 additions and 9 deletions
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7
lib/IR/UseListOrder.cpp
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@ -63,6 +63,9 @@ static void shuffleValueUseLists(Value *V, std::minstd_rand0 &Gen,
DEBUG(dbgs() << "V = "; V->dump());
std::uniform_int_distribution<short> Dist(10, 99);
SmallDenseMap<const Use *, short, 16> Order;
auto compareUses =
[&Order](const Use &L, const Use &R) { return Order[&L] < Order[&R]; };
do {
for (const Use &U : V->uses()) {
auto I = Dist(Gen);
Order[&U] = I;
@ -70,10 +73,10 @@ static void shuffleValueUseLists(Value *V, std::minstd_rand0 &Gen,
<< ", U = ";
U.getUser()->dump());
}
} while (std::is_sorted(V->use_begin(), V->use_end(), compareUses));
DEBUG(dbgs() << " => shuffle\n");
V->sortUseList(
[&Order](const Use &L, const Use &R) { return Order[&L] < Order[&R]; });
V->sortUseList(compareUses);
DEBUG({
for (const Use &U : V->uses()) {