[LLVMbugs] [Bug 16402] BlockFrequency underflow leads to slow code for 7zip

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Jun 21 13:41:48 PDT 2013


Benjamin Kramer <benny.kra at gmail.com> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #5 from Benjamin Kramer <benny.kra at gmail.com> ---
This didn't work, it seems to destroy some assumptions in BlockFrequencyInfo

include/llvm/Analysis/BlockFrequencyImpl.h:247: void
llvm::BlockFrequencyImpl<llvm::MachineBasicBlock, llvm::MachineFunction,
llvm::MachineBranchProbabilityInfo>::doLoop(BlockT *, BlockT *) [BlockT =
llvm::MachineBasicBlock, FunctionT = llvm::MachineFunction, BranchProbInfoT =
llvm::MachineBranchProbabilityInfo]: Assertion `N <= EntryFreq && "Backedge
frequency must be <= EntryFreq!"' failed.

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