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PGO branch weight: update edge weights in IfConverter.

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This commit only handles IfConvertTriangle. To update edge weights
of a successor, one interface is added to MachineBasicBlock:
/// Set successor weight of a given iterator.
setSuccWeight(succ_iterator I, uint32_t weight)

An existing testing case test/CodeGen/Thumb2/v8_IT_5.ll is updated,
since we now correctly update the edge weights, the cold block
is placed at the end of the function and we jump to the cold block.

llvm-svn: 200428
This commit is contained in:
Manman Ren
2014-01-29 23:18:47 +00:00
parent 933edd04af
commit b681918ddd
5 changed files with 101 additions and 1 deletions
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7
llvm/lib/CodeGen/MachineBasicBlock.cpp
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@@ -1123,6 +1123,13 @@ uint32_t MachineBasicBlock::getSuccWeight(const_succ_iterator Succ) const {
return *getWeightIterator(Succ);
}
/// Set successor weight of a given iterator.
void MachineBasicBlock::setSuccWeight(succ_iterator I, uint32_t weight) {
if (Weights.empty())
return;
*getWeightIterator(I) = weight;
}
/// getWeightIterator - Return wight iterator corresonding to the I successor
/// iterator
MachineBasicBlock::weight_iterator MachineBasicBlock::