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* Revert [MBP] Disable aggressive loop rotate in plain modeJordan Rupprecht2019-08-291-1/+1
| | | | | | | | This reverts r369664 (git commit 51f48295cbe8fa3a44db263b528dd9f7bae7bf9a) It causes many benchmark regressions, internally and in llvm's benchmark suite. llvm-svn: 370398
* [MBP] Disable aggressive loop rotate in plain modeGuozhi Wei2019-08-221-1/+1
| | | | | | | | | | Patch https://reviews.llvm.org/D43256 introduced more aggressive loop layout optimization which depends on profile information. If profile information is not available, the statically estimated profile information(generated by BranchProbabilityInfo.cpp) is used. If user program doesn't behave as BranchProbabilityInfo.cpp expected, the layout may be worse. To be conservative this patch restores the original layout algorithm in plain mode. But user can still try the aggressive layout optimization with -force-precise-rotation-cost=true. Differential Revision: https://reviews.llvm.org/D65673 llvm-svn: 369664
* Revert r368339 "[MBP] Disable aggressive loop rotate in plain mode"Hans Wennborg2019-08-121-1/+1
| | | | | | | | | | | | | | | | | | It caused assertions to fire when building Chromium: lib/CodeGen/LiveDebugValues.cpp:331: bool {anonymous}::LiveDebugValues::OpenRangesSet::empty() const: Assertion `Vars.empty() == VarLocs.empty() && "open ranges are inconsistent"' failed. See https://crbug.com/992871#c3 for how to reproduce. > Patch https://reviews.llvm.org/D43256 introduced more aggressive loop layout optimization which depends on profile information. If profile information is not available, the statically estimated profile information(generated by BranchProbabilityInfo.cpp) is used. If user program doesn't behave as BranchProbabilityInfo.cpp expected, the layout may be worse. > > To be conservative this patch restores the original layout algorithm in plain mode. But user can still try the aggressive layout optimization with -force-precise-rotation-cost=true. > > Differential Revision: https://reviews.llvm.org/D65673 llvm-svn: 368579
* [MBP] Disable aggressive loop rotate in plain modeGuozhi Wei2019-08-081-1/+1
| | | | | | | | | | Patch https://reviews.llvm.org/D43256 introduced more aggressive loop layout optimization which depends on profile information. If profile information is not available, the statically estimated profile information(generated by BranchProbabilityInfo.cpp) is used. If user program doesn't behave as BranchProbabilityInfo.cpp expected, the layout may be worse. To be conservative this patch restores the original layout algorithm in plain mode. But user can still try the aggressive layout optimization with -force-precise-rotation-cost=true. Differential Revision: https://reviews.llvm.org/D65673 llvm-svn: 368339
* [MBP] Move a latch block with conditional exit and multi predecessors to top ↵Guozhi Wei2019-06-141-1/+1
| | | | | | | | | | | | | | | | of loop Current findBestLoopTop can find and move one kind of block to top, a latch block has one successor. Another common case is: * a latch block * it has two successors, one is loop header, another is exit * it has more than one predecessors If it is below one of its predecessors P, only P can fall through to it, all other predecessors need a jump to it, and another conditional jump to loop header. If it is moved before loop header, all its predecessors jump to it, then fall through to loop header. So all its predecessors except P can reduce one taken branch. Differential Revision: https://reviews.llvm.org/D43256 llvm-svn: 363471
* [MBP] Don't move bottom block before header if it can't reduce taken branchesGuozhi Wei2019-01-251-0/+36
If bottom of block BB has only one successor OldTop, in most cases it is profitable to move it before OldTop, except the following case: -->OldTop<- | . | | . | | . | ---Pred | | | BB----- Move BB before OldTop can't reduce the number of taken branches, this patch detects this case and prevent the moving. Differential Revision: https://reviews.llvm.org/D57067 llvm-svn: 352236
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