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[VPlan] Restructure code for BranchOnCond codegen. (NFCI)

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Reoder code to exit early if the BranchOnCond isn't in an exiting block.
This delays retrieving the parent region, which may not be present.

Split off from https://github.com/llvm/llvm-project/pull/92651.
This commit is contained in:
Florian Hahn 2024-06-23 20:11:36 +01:00
parent 05d167fc20
commit ab9c2b1c54
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GPG Key ID: 9E54DEA47A8F4434
1 changed files with 7 additions and 7 deletions
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14
llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
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@ -442,20 +442,20 @@ Value *VPInstruction::generatePerPart(VPTransformState &State, unsigned Part) {
return nullptr;
Value *Cond = State.get(getOperand(0), VPIteration(Part, 0));
VPRegionBlock *ParentRegion = getParent()->getParent();
VPBasicBlock *Header = ParentRegion->getEntryBasicBlock();
// Replace the temporary unreachable terminator with a new conditional
// branch, hooking it up to backward destination for exiting blocks now and
// to forward destination(s) later when they are created.
BranchInst *CondBr =
Builder.CreateCondBr(Cond, Builder.GetInsertBlock(), nullptr);
if (getParent()->isExiting())
CondBr->setSuccessor(1, State.CFG.VPBB2IRBB[Header]);
CondBr->setSuccessor(0, nullptr);
Builder.GetInsertBlock()->getTerminator()->eraseFromParent();
if (!getParent()->isExiting())
return CondBr;
VPRegionBlock *ParentRegion = getParent()->getParent();
VPBasicBlock *Header = ParentRegion->getEntryBasicBlock();
CondBr->setSuccessor(1, State.CFG.VPBB2IRBB[Header]);
return CondBr;
}
case VPInstruction::BranchOnCount: {