Dear developers,
May I seek your help with some understanding of why GCC produces the
wrong-code bug? I understand that such a bug can only be reproduced in an
old GCC version, but I still want to know why GCC made mistake here.
The bug-revealing code makes GCC-4.7.0 produce miscompiled code unde
Oh, sorry for the noise, there is an integer overflow that may cause
undefined behavior.
Haoxin Tu 于2022年8月2日周二 11:23写道：
> Dear developers,
>
> May I seek your confirmation to check whether the following program
> triggers a true wrong-code issue in GCC? The following piece of code looks
> too s
Dear developers,
May I seek your confirmation to check whether the following program
triggers a true wrong-code issue in GCC? The following piece of code looks
too simple and I am not quite sure whether it's a bug or not.
Here is the test program (s.c):
```
int a = 0, b = 0;
int main() {
for (; a
Hi Andrew,
I see. Thanks for your speedy reply for clearing my confusion!
Have a great day!
Best regards,
Haoxin
Andrew Pinski 于2022年3月12日周六 12:33写道：
> On Fri, Mar 11, 2022 at 8:21 PM Haoxin Tu via Gcc wrote:
> >
> > Dear developers,
> >
> > May I seek your confir
Dear developers,
May I seek your confirmation to check whether the following program
triggers a true wrong-code issue or not? I don't want to make noise to the
bug repository so I'd like to seek your confirmation here first.
The following case makes GCC outputs differ under -O1 below vs -O1 abov
Hi all.
I hope this is the right place to ask the question.
I found a test case that makes almost all (GCC-5.1 above) versions
(may) produce the wrong code at -Os.
So, I am confused here whether this test case is well-defined or not.
Here is the program (small.c):
```
#include
#include
int16_
Ok, thanks.
Jonathan Wakely 于2020年5月22日 周五14:21写道：
> On Fri, 22 May 2020 at 06:54, Haoxin Tu via Gcc wrote:
> >
> > Hi, there!
> >
> > I am new for using GCC mail list, please forgive me if something is
> wrong.
>
> You're using the wrong mailing list, s
Hi, there!
I am new for using GCC mail list, please forgive me if something is wrong.
I have some issues about how GCC deal with the different optimizations in a
UB program.
For example,
small.cc
*#include unsigned long long a;void b(unsigned long long *c, int
h) { *c = h; }int d = 0;in
