public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c/28289] New: composite_types called to do two different things
@ 2006-07-06 18:00 amylaar at gcc dot gnu dot org
2006-07-07 9:30 ` [Bug c/28289] " rguenth at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: amylaar at gcc dot gnu dot org @ 2006-07-06 18:00 UTC (permalink / raw)
To: gcc-bugs
composite_types is called in c-decl.c to merge function declarations, but in
c-typeck.c to merge the types of two arms of a COND_EXPR. The former should
result in a union of traits of the inputs, which composite_types computes, but
the latter should give the intersection of traits unless the C standard
says otherwise.
In particular, when TREE_READONLY is set for a function type, that means that
this function has no side effect, i.e. it is pure. When a cond expression
yields a function type, it is pure only if both functions are pure.
When a call is made through a COND_EXPR which is improperly marked as yielding
a pure function pointer, and the result is ignored, the actual function call
is not emitted.
Likewise, when we merge the type of a function with a noreturn attribute
with the type of a function without that attribute, merging the types for
a COND_EXPR should yield a function type without this attribute.
--
Summary: composite_types called to do two different things
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: amylaar at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28289
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28289] composite_types called to do two different things
2006-07-06 18:00 [Bug c/28289] New: composite_types called to do two different things amylaar at gcc dot gnu dot org
@ 2006-07-07 9:30 ` rguenth at gcc dot gnu dot org
2006-07-07 16:47 ` amylaar at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-07-07 9:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2006-07-07 09:30 -------
testcase?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28289
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28289] composite_types called to do two different things
2006-07-06 18:00 [Bug c/28289] New: composite_types called to do two different things amylaar at gcc dot gnu dot org
2006-07-07 9:30 ` [Bug c/28289] " rguenth at gcc dot gnu dot org
@ 2006-07-07 16:47 ` amylaar at gcc dot gnu dot org
2006-08-17 13:23 ` amylaar at gcc dot gnu dot org
2008-01-13 18:36 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: amylaar at gcc dot gnu dot org @ 2006-07-07 16:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from amylaar at gcc dot gnu dot org 2006-07-07 16:47 -------
(In reply to comment #1)
> testcase?
>
I couldn't find one yet. I suspect this is hidden by tree-optimizers and
missed
optimization issues.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28289
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28289] composite_types called to do two different things
2006-07-06 18:00 [Bug c/28289] New: composite_types called to do two different things amylaar at gcc dot gnu dot org
2006-07-07 9:30 ` [Bug c/28289] " rguenth at gcc dot gnu dot org
2006-07-07 16:47 ` amylaar at gcc dot gnu dot org
@ 2006-08-17 13:23 ` amylaar at gcc dot gnu dot org
2008-01-13 18:36 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: amylaar at gcc dot gnu dot org @ 2006-08-17 13:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from amylaar at gcc dot gnu dot org 2006-08-17 13:23 -------
(In reply to comment #0)
Note, this bug had caused a bootstrap failure, discussed here:
http://gcc.gnu.org/ml/gcc/2006-07/msg00108.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28289
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28289] composite_types called to do two different things
2006-07-06 18:00 [Bug c/28289] New: composite_types called to do two different things amylaar at gcc dot gnu dot org
` (2 preceding siblings ...)
2006-08-17 13:23 ` amylaar at gcc dot gnu dot org
@ 2008-01-13 18:36 ` rguenth at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-01-13 18:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2008-01-13 18:17 -------
34768 has a testcase.
*** This bug has been marked as a duplicate of 34768 ***
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28289
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2008-01-13 18:17 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2006-07-06 18:00 [Bug c/28289] New: composite_types called to do two different things amylaar at gcc dot gnu dot org
2006-07-07 9:30 ` [Bug c/28289] " rguenth at gcc dot gnu dot org
2006-07-07 16:47 ` amylaar at gcc dot gnu dot org
2006-08-17 13:23 ` amylaar at gcc dot gnu dot org
2008-01-13 18:36 ` rguenth at gcc dot gnu dot org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).