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Rewrite previous patch to follow Chris' stylistic
preference; no functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78391 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -850,6 +850,27 @@ bool BranchFolder::CanFallThrough(MachineBasicBlock *CurBB) {
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return CanFallThrough(CurBB, CurUnAnalyzable, TBB, FBB, Cond);
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return CanFallThrough(CurBB, CurUnAnalyzable, TBB, FBB, Cond);
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}
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}
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/// RemoveDuplicateSuccessor - make sure block Pred has at most one
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/// successor edge leading to Succ. This is only called in one place,
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/// but Chris prefers that it be a separate function.
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static void RemoveDuplicateSuccessor(MachineBasicBlock *Pred,
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MachineBasicBlock *Succ) {
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MachineBasicBlock::succ_iterator SI = Pred->succ_begin();
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bool found = false;
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while (SI != Pred->succ_end()) {
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if (*SI == Succ) {
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if (!found) {
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found = true;
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++SI;
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} else {
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SI = Pred->removeSuccessor(SI);
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}
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} else {
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++SI;
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}
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}
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}
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/// IsBetterFallthrough - Return true if it would be clearly better to
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/// IsBetterFallthrough - Return true if it would be clearly better to
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/// fall-through to MBB1 than to fall through into MBB2. This has to return
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/// fall-through to MBB1 than to fall through into MBB2. This has to return
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/// a strict ordering, returning true for both (MBB1,MBB2) and (MBB2,MBB1) will
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/// a strict ordering, returning true for both (MBB1,MBB2) and (MBB2,MBB1) will
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@ -896,20 +917,7 @@ void BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) {
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// If this resulted in a predecessor with true and false edges
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// If this resulted in a predecessor with true and false edges
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// both going to the fallthrough block, clean up;
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// both going to the fallthrough block, clean up;
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// BranchFolding doesn't like this.
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// BranchFolding doesn't like this.
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MachineBasicBlock::succ_iterator SI = Pred->succ_begin();
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RemoveDuplicateSuccessor(Pred, FallThrough);
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bool found = false;
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while (SI != Pred->succ_end()) {
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if (*SI == FallThrough) {
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if (!found) {
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found = true;
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++SI;
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} else {
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SI = Pred->removeSuccessor(SI);
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}
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} else {
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++SI;
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}
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}
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}
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}
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// If MBB was the target of a jump table, update jump tables to go to the
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// If MBB was the target of a jump table, update jump tables to go to the
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// fallthrough instead.
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// fallthrough instead.
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