https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38785
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |NEW
Last reconfirmed|2010-02-19 12:17:54 |2018-2-5
--- Comment #49 from Richard Biener <rguenth at gcc dot gnu.org> ---
The testcase from comment#3 still reproduces the issue for me:
<bb 6> [local count: 955630223]:
# cstore_55 = PHI <2147483647(4), 0(5)>
# prephitmp_87 = PHI <3221225470(4), 1073741823(5)>
# prephitmp_88 = PHI <3937053352(4), 1789569705(5)>
... many more...
# prephitmp_116 = PHI <2934894317(4), 787410670(5)>
# prephitmp_117 = PHI <2505397588(4), 357913941(5)>
MEM[(void *)_3] = cstore_55;
_7 = *_4;
...
There's the old issue of PRE lacking a cost model (and undoing PRE
being impossible for these cases).
