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Summary

  1. [Coroutines] Remove corresponding phi values when apply (details)
Commit 83a9321f60d837e4d41c9c08c09ab9e4c171ada4 by modocache
[Coroutines] Remove corresponding phi values when apply
simplifyTerminatorLeadingToRet
Summary: In addMustTailToCoroResumes, we set musttail on those resume
instructions that are followed by a ret instruction. This is done by
simplifyTerminatorLeadingToRet which replace a sequence of branches
leading to a ret with a clone of the ret.
However it forgets to remove corresponding PHI values that come from
basic block of replaced branch, and may cause jumpthreading pass hangs
(https://bugs.llvm.org/show_bug.cgi?id=43720)
This patch fix this issue
Test Plan: cppcoro library with O3+flto check-llvm
Reviewers: modocache, GorNishanov, lewissbaker
Reviewed By: modocache
Subscribers: mehdi_amini, EricWF, hiraditya, dexonsmith, jfb,
llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D71826
Patch by junparser (JunMa)!
The file was modifiedllvm/lib/Transforms/Coroutines/CoroSplit.cpp
The file was modifiedllvm/test/Transforms/Coroutines/coro-split-musttail.ll
The file was addedllvm/test/Transforms/Coroutines/coro-split-musttail1.ll