------- Comment #4 from rguenth at gcc dot gnu dot org 2008-03-19 10:23 -------
This is a bug in the C frontend which does the increment on type char, not
on the promoted type (I noticed that while fixing bitfield issues as well),
code in question is in build_unary_op() and this way since forever.
Original dump as from the FE:
;; Function main (main)
;; enabled by -tree-original
{
char c;
char c;
c = 0;
<D.1559>:;
foo ((int) c);
c++ ;
goto <D.1559>;
}
I tried to fix this once but failed. Joseph - can you give this a shot?
The FE should for all pre-/postincrements just emit the proper
{( int res = x; x = (typeof x)((int)x + 1); res; )}
with using TARGET_EXPR/COMPOUND_EXPRs as required.
Note the C++ frontend has the same problem here, so transition that bug
there once the C FE is fixed.
Thanks.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jsm28 at gcc dot gnu dot org
Status|UNCONFIRMED |NEW
Component|target |c
Ever Confirmed|0 |1
Keywords| |wrong-code
Priority|P3 |P1
Last reconfirmed|0000-00-00 00:00:00 |2008-03-19 10:23:48
date| |
Target Milestone|--- |4.1.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35634
