https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93063
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2020-01-09
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I belive gimple_assign_unary_nop_p is failing to notice bit-level
truncations/extensions since it only checks the mode. Likely noticable
when you make either the lhs or the rhs access an array of say
struct { short a : 3 }; and do q[i].a.
Otherwise confirmed. Might also apply to VIEW_CONVERTs of int to float
for example, to get this the source would use a union temporary like
u.f = *q++;
*p++ = u.i;
or so. Just to add more cases we miss ;)
