https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116487
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
<source>: In function 'b':
<source>:19:18: warning: 'bf' is used uninitialized [-Wuninitialized]
19 | *bh = bg ^= bf || 0;
| ~~~^~~~
<source>:16:11: note: 'bf' was declared here
16 | int64_t bf;
| ^~
<source>: In function 'main':
<source>:34:10: warning: iteration 1 invokes undefined behavior
[-Waggressive-loop-optimizations]
34 | c[i] = crc;
| ~~~~~^~~~~
<source>:27:12: note: within this loop
27 | for (; i < 256; i++) {
| ~~^~~~~
Undefined behavior == different output at different optimization level.
