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* [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code
@ 2015-10-15 20:25 nacitar at ubercpp dot com
2015-10-15 20:26 ` [Bug c++/67980] " nacitar at ubercpp dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: nacitar at ubercpp dot com @ 2015-10-15 20:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980
Bug ID: 67980
Summary: left shift count is negative [-Wshift-count-negative]
generated for unreachable code
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nacitar at ubercpp dot com
Target Milestone: ---
Created attachment 36519
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36519&action=edit
test driver
With -Wall, unreachable code in a constexpr function generates a warning if
written using c++14's expanded constexpr and using actual if statements,
however does not in the case of a ternary-styled c++11 constexpr function.
This can be worked around using template specializations, but certainly this
error shouldn't happen given that these values are all known at compilation
time and it's impossible for that count to ever actually be negative.
This is a simplification of the problem from a larger issue.
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com @ 2015-10-15 20:26 ` nacitar at ubercpp dot com 2015-10-15 20:32 ` pinskia at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: nacitar at ubercpp dot com @ 2015-10-15 20:26 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 --- Comment #1 from Jacob McIntosh <nacitar at ubercpp dot com> --- > but certainly this error shouldn't happen By error, I meant "warning". ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com 2015-10-15 20:26 ` [Bug c++/67980] " nacitar at ubercpp dot com @ 2015-10-15 20:32 ` pinskia at gcc dot gnu.org 2015-10-15 20:43 ` nacitar at ubercpp dot com ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2015-10-15 20:32 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There is another bug about this specific issue. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com 2015-10-15 20:26 ` [Bug c++/67980] " nacitar at ubercpp dot com 2015-10-15 20:32 ` pinskia at gcc dot gnu.org @ 2015-10-15 20:43 ` nacitar at ubercpp dot com 2015-10-16 7:40 ` rguenth at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: nacitar at ubercpp dot com @ 2015-10-15 20:43 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 --- Comment #3 from Jacob McIntosh <nacitar at ubercpp dot com> --- (In reply to Andrew Pinski from comment #2) > There is another bug about this specific issue. Which? ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com ` (2 preceding siblings ...) 2015-10-15 20:43 ` nacitar at ubercpp dot com @ 2015-10-16 7:40 ` rguenth at gcc dot gnu.org 2015-10-20 15:58 ` paolo.carlini at oracle dot com 2015-10-20 17:01 ` paolo.carlini at oracle dot com 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2015-10-16 7:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |diagnostic Status|UNCONFIRMED |NEW Last reconfirmed| |2015-10-16 Ever confirmed|0 |1 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com ` (3 preceding siblings ...) 2015-10-16 7:40 ` rguenth at gcc dot gnu.org @ 2015-10-20 15:58 ` paolo.carlini at oracle dot com 2015-10-20 17:01 ` paolo.carlini at oracle dot com 5 siblings, 0 replies; 7+ messages in thread From: paolo.carlini at oracle dot com @ 2015-10-20 15:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/67980] left shift count is negative [-Wshift-count-negative] generated for unreachable code 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com ` (4 preceding siblings ...) 2015-10-20 15:58 ` paolo.carlini at oracle dot com @ 2015-10-20 17:01 ` paolo.carlini at oracle dot com 5 siblings, 0 replies; 7+ messages in thread From: paolo.carlini at oracle dot com @ 2015-10-20 17:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |NEW Assignee|paolo.carlini at oracle dot com |unassigned at gcc dot gnu.org ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2015-10-20 17:01 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-10-15 20:25 [Bug c++/67980] New: left shift count is negative [-Wshift-count-negative] generated for unreachable code nacitar at ubercpp dot com 2015-10-15 20:26 ` [Bug c++/67980] " nacitar at ubercpp dot com 2015-10-15 20:32 ` pinskia at gcc dot gnu.org 2015-10-15 20:43 ` nacitar at ubercpp dot com 2015-10-16 7:40 ` rguenth at gcc dot gnu.org 2015-10-20 15:58 ` paolo.carlini at oracle dot com 2015-10-20 17:01 ` paolo.carlini at oracle dot com
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