https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100112
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tree-optimization |ipa
Keywords| |missed-optimization
Ever confirmed|0 |1
CC| |marxin at gcc dot gnu.org
Status|UNCONFIRMED |NEW
Version|unknown |11.0
Last reconfirmed| |2021-04-20
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's very late eliminated at -O1 (DCE7) while with -O3 we still have
<bb 2> [local count: 1073741824]:
_2 = e;
_3 = _2 + 1;
e = _3;
c.1_4 = c;
if (c.1_4 == 0B)
goto <bb 3>; [48.88%]
else
goto <bb 4>; [51.12%]
<bb 3> [local count: 524845000]:
foo ();
there. In the end it's some IPA issue, failing to make 'c' readonly at -O3
vs. -O1.
