https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105937
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
Target Milestone|--- |12.2
Summary|[12] Regression with |[12/13 Regression]
|maybe-uninitialized |maybe-uninitialized with
| |std::optional
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
# ttfRunIndex_64 = PHI <ttfRunIndex_6(52), [/app/example.cpp:207:27] 0(30)>
# ttfRunIndex$8_65 = PHI <ttfRunIndex$8_8(52), [/app/example.cpp:207:27]
0(30)>
...
<L17>:
[/app/example.cpp:213:13] if (ttfRunIndex$8_65 != 0)
goto <bb 22>; [33.00%]
else
goto <bb 48>; [67.00%]
...
<bb 22> [local count: 157594832]:
[/app/example.cpp:216:62] len_15 = _20 - ttfRunIndex_64;
...
# ttfRunIndex_6 = PHI <ttfRunIndex_14(D)(26), ttfRunIndex_64(48), _20(21),
ttfRunIndex_64(49)>
# ttfRunIndex$8_8 = PHI <0(26), 0(48), [/app/example.cpp:227:29] 1(21),
1(49)>
So if anything this is both a missed optimization and the maybe uninitialized
predicates is not doing its job correctly.
