diff options
| author | Krzysztof Parzyszek <kparzysz@codeaurora.org> | 2017-03-06 19:12:42 +0000 |
|---|---|---|
| committer | Krzysztof Parzyszek <kparzysz@codeaurora.org> | 2017-03-06 19:12:42 +0000 |
| commit | 5b8fae5edd57b6a9ca8a282b508bee0537bc7957 (patch) | |
| tree | 52ef7c2687e012326ee1f1638563ca19dce805a0 /llvm/lib/CodeGen/IfConversion.cpp | |
| parent | a96eac62d6b4180969876f4be0340b7f03b0b4cd (diff) | |
[IfConversion] Only renormalize probabilities if branches are analyzable
If a block has non-analyzable branches, the listed successors don't need
to add up to one. For example, if a block has a conditional tail call,
that tail call will not have a corresponding successor in the successor
list, but will still be a possible branch.
Differential Revision: https://reviews.llvm.org/D30556
llvm-svn: 297054
Diffstat (limited to 'llvm/lib/CodeGen/IfConversion.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/IfConversion.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp index 8b87aa16b819..37fe41582333 100644 --- a/llvm/lib/CodeGen/IfConversion.cpp +++ b/llvm/lib/CodeGen/IfConversion.cpp @@ -2148,7 +2148,8 @@ void IfConverter::MergeBlocks(BBInfo &ToBBI, BBInfo &FromBBI, bool AddEdges) { // unknown probabilities into known ones. // FIXME: This usage is too tricky and in the future we would like to // eliminate all unknown probabilities in MBB. - ToBBI.BB->normalizeSuccProbs(); + if (ToBBI.IsBrAnalyzable) + ToBBI.BB->normalizeSuccProbs(); SmallVector<MachineBasicBlock *, 4> FromSuccs(FromMBB.succ_begin(), FromMBB.succ_end()); @@ -2228,7 +2229,8 @@ void IfConverter::MergeBlocks(BBInfo &ToBBI, BBInfo &FromBBI, bool AddEdges) { // Normalize the probabilities of ToBBI.BB's successors with all adjustment // we've done above. - ToBBI.BB->normalizeSuccProbs(); + if (ToBBI.IsBrAnalyzable && FromBBI.IsBrAnalyzable) + ToBBI.BB->normalizeSuccProbs(); ToBBI.Predicate.append(FromBBI.Predicate.begin(), FromBBI.Predicate.end()); FromBBI.Predicate.clear(); |