https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63986
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2014-11-20
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
Target Milestone|--- |5.0
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think you were mostly lucky -- 4.9 expands from
<bb 2>:
_3 = a_2(D) == 0;
_13 = ~_3;
_7 = (int) _13;
MEM[(int *)d_5(D) + 8B] = _7;
if (_3 != 0)
which it reaches in a very weird way through several optimization passes
while trunk now has
<bb 2>:
_7 = a_2(D) != 0;
_8 = (int) _7;
MEM[(int *)d_5(D) + 8B] = _8;
if (a_2(D) == 0)
which has un-CSEd the a_2 == 0 comparison due to a bug I introduced.
