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Normalize successors' probabilities when building MBBs for jump table.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254837 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cong Hou 2015-12-05 05:00:55 +00:00
parent 2b76269756
commit c7d0ead45b
2 changed files with 3 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -8259,12 +8259,14 @@ void SelectionDAGBuilder::lowerWorkItem(SwitchWorkListItem W, Value *Cond,
JumpProb += DefaultProb / 2;
FallthroughProb -= DefaultProb / 2;
JumpMBB->setSuccProbability(SI, DefaultProb / 2);
JumpMBB->normalizeSuccProbs();
break;
}
}
addSuccessorWithProb(CurMBB, Fallthrough, FallthroughProb);
addSuccessorWithProb(CurMBB, JumpMBB, JumpProb);
CurMBB->normalizeSuccProbs();
// The jump table header will be inserted in our current block, do the
// range check, and fall through to our fallthrough block.

2
test/CodeGen/X86/switch-edge-weight.ll
View File

@ -111,7 +111,7 @@ sw.epilog:
; BB#8 to BB#3: {11} (10)
; BB#8 to BB#4: {12} (10)
; BB#8 to BB#5: {13, 14} (20)
; CHECK: Successors according to CFG: BB#1({{[0-9a-fx/= ]+}}14.29%) BB#6({{[0-9a-fx/= ]+}}7.14%) BB#2({{[0-9a-fx/= ]+}}14.29%) BB#3({{[0-9a-fx/= ]+}}14.29%) BB#4({{[0-9a-fx/= ]+}}14.29%) BB#5({{[0-9a-fx/= ]+}}28.57%)
; CHECK: Successors according to CFG: BB#1({{[0-9a-fx/= ]+}}15.38%) BB#6({{[0-9a-fx/= ]+}}7.69%) BB#2({{[0-9a-fx/= ]+}}15.38%) BB#3({{[0-9a-fx/= ]+}}15.38%) BB#4({{[0-9a-fx/= ]+}}15.38%) BB#5({{[0-9a-fx/= ]+}}30.77%)
}
; CHECK-LABEL: test3