static bool hasOnlyUniformBranches(Region *R, unsigned UniformMDKindID,
const DivergenceAnalysis &DA) {
for (auto E : R->elements()) {
if (!E->isSubRegion()) {
auto Br = dyn_cast<BranchInst>(E->getEntry()->getTerminator());
if (!Br || !Br->isConditional())
continue;
if (!DA.isUniform(Br))
return false;
LLVM_DEBUG(dbgs() << "BB: " << Br->getParent()->getName()
<< " has uniform terminator\n");
} else {
// Explicitly refuse to treat regions as uniform if they have non-uniform
// subregions. We cannot rely on DivergenceAnalysis for branches in
// subregions because those branches may have been removed and re-created,
// so we look for our metadata instead.
//
// Warning: It would be nice to treat regions as uniform based only on
// their direct child basic blocks' terminators, regardless of whether
// subregions are uniform or not. However, this requires a very careful
// look at SIAnnotateControlFlow to make sure nothing breaks there.
for (auto BB : E->getNodeAs<Region>()->blocks()) {
auto Br = dyn_cast<BranchInst>(BB->getTerminator());
if (!Br || !Br->isConditional())
continue;
if (!Br->getMetadata(UniformMDKindID))
return false;
}
}
}
return true;
}
static bool hasOnlyUniformBranches(const Region *R,
const DivergenceAnalysis &DA) {
for (const BasicBlock *BB : R->blocks()) {
const BranchInst *Br = dyn_cast<BranchInst>(BB->getTerminator());
if (!Br || !Br->isConditional())
continue;
if (!DA.isUniform(Br->getCondition()))
return false;
DEBUG(dbgs() << "BB: " << BB->getName() << " has uniform terminator\n");
}
return true;
}