Public bug reported:
If I compile the attached file with -O3, gcc produces an empty function
(simply returns 0). If I compile without -O3, gcc produces viable code
that functions as expected.
Linux outhouse 5.4.0-58-generic #64-Ubuntu SMP Wed Dec 9 08:16:25 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux
gcc 4:9.3.0-1ubuntu2
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "Sample program that demonstrates problem"
https://bugs.launchpad.net/bugs/1909838/+attachment/5448643/+files/match_fcb.c
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https://bugs.launchpad.net/bugs/1909838
Title:
gcc -O3 produces invalid code
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