[PATCH] D84471: [X86] Fix for ballooning compile times due to Load Value Injection (LVI) mitigations

Mon Jul 27 10:30:30 PDT 2020

sconstab updated this revision to Diff 280966.
sconstab added a comment.

Made one further optimization.

At line 669, I added a check that will only invoke `elimMitigatedEdgesAndNodes()` if the current function already has `LFENCE`s that may mitigate some gadgets. If the function does not have any `LFENCE`s, then `elimMitigatedEdgesAndNodes()` will not transform the gadget graph because (a) there are no fences to eliminate, and (b) the new heuristic only performs *one* round of cuts *after* `elimMitigatedEdgesAndNodes()` runs.

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D84471/new/

https://reviews.llvm.org/D84471

Files:
  llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp

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