https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Roger Sayle changed:
What|Removed |Added
Status|ASSIGNED|RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #30 from CVS Commits ---
The master branch has been updated by Roger Sayle :
https://gcc.gnu.org/g:eb1d8df792f990574cbb695b55c92ee2684fc96b
commit r13-6621-geb1d8df792f990574cbb695b55c92ee2684fc96b
Author: Roger Sayle
Date: Sun
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #29 from Jakub Jelinek ---
(In reply to Roger Sayle from comment #28)
> The integer_all_onesp test is only equivalent to -1 when the TREE_TYPE (x)
> is the same width or wider than type
... or the narrower type is signed.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Roger Sayle changed:
What|Removed |Added
Status|NEW |ASSIGNED
CC|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #27 from Martin Liška ---
Polished a bit more into:
unsigned char f = 0;
int main() {
unsigned g = 0;
unsigned *p1 = &g;
unsigned char *p2 = &f;
do {
(*p1)++;
(*p2)--;
} while (f);
__builtin_printf ("g=%u\n",
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #26 from Martin Liška ---
Simplified to:
unsigned char zero;
int main() {
unsigned g = 0;
unsigned *p1 = &g;
unsigned char *p2 = &zero;
do {
(*p1)++;
(*p2)--;
} while (zero);
__builtin_printf ("g=%u\n", g);
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Martin Liška changed:
What|Removed |Added
Target Milestone|--- |13.0
Priority|P3
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Martin Liška changed:
What|Removed |Added
Keywords|needs-reduction |
--- Comment #25 from Martin Liška ---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #24 from David Binderman ---
I tried experimenting with the flags that change -O1 into -O2 and got this:
$ for i in ~/gcc/results.202205*/bin/gcc; do echo $i; $i -w
-ftrivial-auto-var-init=zero -O1 -fno-strict-aliasing bug892.c && (
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Martin Liška changed:
What|Removed |Added
CC||sayle at gcc dot gnu.org
Sta
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
David Binderman changed:
What|Removed |Added
Status|RESOLVED|UNCONFIRMED
Resolution|INVALI
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #21 from Martin Liška ---
(In reply to Jakub Jelinek from comment #20)
> Well, cvise reduction of runtime testcases is always problematic, and trying
> to ensure
> the reduction doesn't introduce uninitialized var uses which weren't
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Jakub Jelinek changed:
What|Removed |Added
CC||jakub at gcc dot gnu.org
--- Comment #2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
Martin Liška changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #18 from David Binderman ---
Part way through reduction, the C code seems to be
int crc32_tab_0;
int crc32_context = 0xUL;
void main(int , char []) {
{
int crc;
int i;
i = 0;
for (; i < 256; i++)
crc3
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #17 from David Binderman ---
(In reply to Martin Liška from comment #16)
> bash -x qwe.sh bug892.c
That's a really useful tip. Thanks. I've debugged the script some more
and now have:
rm -f 1 2 one.exe two.exe
/usr/bin/gcc -w -Werr
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #16 from Martin Liška ---
(In reply to David Binderman from comment #15)
> (In reply to Martin Liška from comment #14)
> > > cvise is written in perl, isn't it ? You've got my cvise script.
> >
> > No, it's written in Python.
>
> O
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #15 from David Binderman ---
(In reply to Martin Liška from comment #14)
> > cvise is written in perl, isn't it ? You've got my cvise script.
>
> No, it's written in Python.
Of course. How stupid of me.
> So show me how you run cv
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #14 from Martin Liška ---
(In reply to David Binderman from comment #13)
> (In reply to Martin Liška from comment #12)
> > > perl program converted to 0 is proving to be a challenge.
> >
> > perl? Please provide a complete script re
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #13 from David Binderman ---
(In reply to Martin Liška from comment #12)
> > perl program converted to 0 is proving to be a challenge.
>
> perl? Please provide a complete script reproducer.
cvise is written in perl, isn't it ? You'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #12 from Martin Liška ---
> perl program converted to 0 is proving to be a challenge.
perl? Please provide a complete script reproducer.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #11 from David Binderman ---
(In reply to Martin Liška from comment #10)
> What about:
>
> /usr/bin/gcc -w -Werror=implicit bug892.c -o one.exe
> && (./one.exe 1 | fgrep "checksum after hashing g_50 :" > 1)
> && /home/d
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #10 from Martin Liška ---
(In reply to David Binderman from comment #9)
> (In reply to Martin Liška from comment #8)
> > > but then if diff returns 1, the script should return 0 and
> > > if diff returns 0, then the script should ret
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #9 from David Binderman ---
(In reply to Martin Liška from comment #8)
> > but then if diff returns 1, the script should return 0 and
> > if diff returns 0, then the script should return 1.
>
> You can take an inspiration here:
> ht
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #8 from Martin Liška ---
(In reply to David Binderman from comment #7)
> (In reply to David Binderman from comment #4)
> > Created attachment 54596 [details]
> > C source code
> >
> > After 3 hours further reduction.
>
> I am strug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #7 from David Binderman ---
(In reply to David Binderman from comment #4)
> Created attachment 54596 [details]
> C source code
>
> After 3 hours further reduction.
I am struggling with further reduction. My bash knowledge is short.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #6 from Andrew Pinski ---
(In reply to Andrew Pinski from comment #5)
> Both testcases I tested all exited with a non-zero value even at -O0 ...
Ok, I missed you need to pass an argument to the program. Anyways I think this
might be
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #5 from Andrew Pinski ---
Both testcases I tested all exited with a non-zero value even at -O0 ...
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #4 from David Binderman ---
Created attachment 54596
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54596&action=edit
C source code
After 3 hours further reduction.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #3 from David Binderman ---
20220508 is good, so the range is 20220508 to 20220515.
In git hash terms, that's g:a1947c92f7cda5f6cf7b8d8a9a44f6dd45352c03
to g:18547874ee205d830acb31f1e3c1c89fc7725c14.
I will try to reduce the code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #2 from David Binderman ---
(In reply to David Binderman from comment #1)
> I will try to bisect this one with snapshots. Trying 20220515 first.
This one bad. Trying 20220508.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109031
--- Comment #1 from David Binderman ---
I will try to bisect this one with snapshots. Trying 20220515 first.
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