[PATCH] D105374: [SimplifyCFG] simplifyUnreachable(): erase instructions iff they are guaranteed to transfer execution to unreachable
Roman Lebedev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jul 2 13:39:27 PDT 2021
lebedev.ri created this revision.
lebedev.ri added reviewers: spatel, nikic, efriedma, nlopes, jdoerfert.
lebedev.ri added a project: LLVM.
Herald added subscribers: jfb, hiraditya, nemanjai.
lebedev.ri requested review of this revision.
This synces the code with InstCombine's implementation in `InstCombinerImpl::visitUnreachableInst()`,
with one exception that here in SimplifyCFG we are allowed to remove EH instructions.
Effectively, this now allows SimplifyCFG to remove calls (iff they won't throw and will return),
arithmetic/logic operations, etc.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D105374
Files:
llvm/lib/Analysis/ValueTracking.cpp
llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
llvm/lib/Transforms/Utils/SimplifyCFG.cpp
llvm/test/CodeGen/PowerPC/2007-11-16-landingpad-split.ll
llvm/test/Transforms/SimplifyCFG/simplifyUnreachable-degenerate-conditional-branch-with-matching-destinations.ll
llvm/test/Transforms/SimplifyCFG/switch-range-to-icmp.ll
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