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authorChandler Carruth <chandlerc@gmail.com>2017-04-19 06:23:20 +0000
committerChandler Carruth <chandlerc@gmail.com>2017-04-19 06:23:20 +0000
commitae3386aa7449571c7ae5101b2f425021d3b93f98 (patch)
tree1cebefd5fc0b0d06241735c4289537ed71b25393 /llvm/lib/Transforms
parent47d58ea681d9a9f1bbce7e37963d5179f227d7a5 (diff)
downloadbcm5719-llvm-ae3386aa7449571c7ae5101b2f425021d3b93f98.tar.gz
bcm5719-llvm-ae3386aa7449571c7ae5101b2f425021d3b93f98.zip
Revert r300657 due to crashes in stage2 of bootstraps:
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/2476/steps/build-stage2-LLVMgold.so/logs/stdio http://bb.pgr.jp/builders/clang-3stage-x86_64-linux/builds/15036/steps/build_llvmclang/logs/stdio I've updated the commit thread, reverting to get the bots back to green. Original commit summary: [JumpThread] We want to fold (not thread) when all predecessor go to single BB's successor. llvm-svn: 300662
Diffstat (limited to 'llvm/lib/Transforms')
-rw-r--r--llvm/lib/Transforms/Scalar/JumpThreading.cpp27
1 files changed, 0 insertions, 27 deletions
diff --git a/llvm/lib/Transforms/Scalar/JumpThreading.cpp b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
index 5d193c54282..08eb95a1a3d 100644
--- a/llvm/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
@@ -1289,33 +1289,6 @@ bool JumpThreadingPass::ProcessThreadableEdges(Value *Cond, BasicBlock *BB,
if (PredToDestList.empty())
return false;
- // If all the predecessors go to a single known successor, we want to fold,
- // not thread. By doing so, we do not need to duplicate the current block and
- // also miss potential opportunities in case we don't/can't duplicate.
- if (OnlyDest && OnlyDest != MultipleDestSentinel) {
- if (PredToDestList.size() ==
- (size_t)std::distance(pred_begin(BB), pred_end(BB))) {
- for (BasicBlock *SuccBB : successors(BB)) {
- if (SuccBB != OnlyDest)
- SuccBB->removePredecessor(BB, true); // This is unreachable successor.
- }
-
- // Finally update the terminator.
- TerminatorInst *Term = BB->getTerminator();
- BranchInst::Create(OnlyDest, Term);
- Term->eraseFromParent();
-
- // If the condition is now dead due to the removal of the old terminator,
- // erase it.
- auto *CondInst = dyn_cast<Instruction>(Cond);
- if (CondInst && CondInst->use_empty())
- CondInst->eraseFromParent();
- // FIXME: in case this instruction is defined in the current BB and it
- // resolves to a single value from all predecessors, we can do RAUW.
- return true;
- }
- }
-
// Determine which is the most common successor. If we have many inputs and
// this block is a switch, we want to start by threading the batch that goes
// to the most popular destination first. If we only know about one
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