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* [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
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