[llvm-bugs] [Bug 49208] Wrong optimization around memset

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Feb 16 13:19:04 PST 2021


Nikita Popov <nikita.ppv at gmail.com> changed:

           What    |Removed                     |Added
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED
                 CC|                            |nikita.ppv at gmail.com

--- Comment #1 from Nikita Popov <nikita.ppv at gmail.com> ---
You have an incorrectly placed

  call void @llvm.lifetime.start.p0i8(i64 24, i8* nonnull %2)

call after a number of stores already happened into the alloca. lifetime.start
effectively overwrites the alloca with undef, thus the observed behavior.

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