https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116215
Bug ID: 116215
Summary: -Wstringop-overflow in i386-expand.cc
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 58813
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58813&action=edit
i386-expand.ii.xz
```
$ gcc -c i386-expand.ii -O3 -Werror=stringop-overflow
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:
In function ‘bool expand_vec_perm_interleave2(expand_vec_perm_d*)’:
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21384:38:
error: writing 16 bytes into a region of size 8 [-Werror=stringop-overflow=]
21384 | dremap.perm[i + nelt2] = i + nonzero_halves[1] * nelt2;
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21179:28:
note: at offset [88, 96] into destination object ‘dremap’ of size 96
21179 | struct expand_vec_perm_d dremap, dfinal;
| ^~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21327:38:
error: writing 16 bytes into a region of size 8 [-Werror=stringop-overflow=]
21327 | dremap.perm[i + nelt2] = i + nelt;
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21179:28:
note: at offset [88, 96] into destination object ‘dremap’ of size 96
21179 | struct expand_vec_perm_d dremap, dfinal;
| ^~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21308:38:
error: writing 16 bytes into a region of size 8 [-Werror=stringop-overflow=]
21308 | dremap.perm[i + nelt2] = i + nelt + nelt2;
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:21179:28:
note: at offset [88, 96] into destination object ‘dremap’ of size 96
21179 | struct expand_vec_perm_d dremap, dfinal;
| ^~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:
In function ‘bool expand_vec_perm_punpckldq_pshuf(expand_vec_perm_d*)’:
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:20940:32:
error: writing 16 bytes into a region of size 8 [-Werror=stringop-overflow=]
20940 | dperm.perm[i + nelt / 2] = d->perm[i];
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/config/i386/i386-expand.cc:20925:28:
note: at offset [88, 96] into destination object ‘dperm’ of size 96
20925 | struct expand_vec_perm_d dperm;
| ^~~~~
[...]
```
