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Improve the successor list update in TailDuplication.cpp.

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This patch improves a temporary fix in r255530 so that we can normalize
successor list without trigger assertion failures in tail duplication pass.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255638 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cong Hou 2015-12-15 10:10:40 +00:00
parent 35a68db8ba
commit 892628b503
2 changed files with 7 additions and 7 deletions
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12
lib/CodeGen/TailDuplication.cpp
View File

@ -745,12 +745,12 @@ TailDuplicatePass::duplicateSimpleBB(MachineBasicBlock *TailBB,
if (PredTBB)
TII->InsertBranch(*PredBB, PredTBB, PredFBB, PredCond, DebugLoc());
auto Prob = MBPI->getEdgeProbability(PredBB, TailBB);
PredBB->removeSuccessor(TailBB);
unsigned NumSuccessors = PredBB->succ_size();
assert(NumSuccessors <= 1);
if (NumSuccessors == 0 || *PredBB->succ_begin() != NewTarget)
PredBB->addSuccessor(NewTarget, Prob);
if (!PredBB->isSuccessor(NewTarget))
PredBB->replaceSuccessor(TailBB, NewTarget);
else {
PredBB->removeSuccessor(TailBB, 0);
assert(PredBB->succ_size() <= 1);
}
TDBBs.push_back(PredBB);
}

2
test/CodeGen/ARM/taildup-branch-weight.ll
View File

@ -30,7 +30,7 @@ B4:
!0 = !{!"branch_weights", i32 4, i32 124}
; CHECK: Machine code for function test1:
; CHECK: Successors according to CFG: BB#1({{[0-9a-fx/= ]+}}3.12%) BB#2({{[0-9a-fx/= ]+}}96.88%)
; CHECK: Successors according to CFG: BB#2(0x7c000000 / 0x80000000 = 96.88%) BB#1(0x04000000 / 0x80000000 = 3.12%)
@g0 = common global i32 0, align 4