llvm /
llvm /
d0e8089e646a7254aa3e4e00cdc016f29d73678a [HotColdSplitting] Refine definition of unlikelyExecuted
The splitting pass uses its 'unlikelyExecuted' predicate to statically
decide which blocks are cold.
- Do not treat noreturn calls as if they are cold unless they are actually
marked cold. This is motivated by functions like exit() and longjmp(), which
are not beneficial to outline.
- Do not treat inline asm as an outlining barrier. In practice asm("") is
frequently used to inhibit basic block merging; enabling outlining in this case
results in substantial memory savings.
- Treat invokes of cold functions as cold.
As a drive-by, remove the 'exceptionHandlingFunctions' predicate, because it's
no longer needed. The pass can identify & outline blocks dominated by EH pads,
so there's no need to special-case __cxa_begin_catch etc.
Differential Revision: https://reviews.llvm.org/D54244
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348640 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed
