[Bug tree-optimization/95490] New: [10/11 Regression] writing 1 byte into a region of size 0 [-Wstringop-overflow=] since r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce

[Bug tree-optimization/95490] New: [10/11 Regression] writing 1 byte into a region of size 0 [-Wstringop-overflow=] since r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95490

            Bug ID: 95490
           Summary: [10/11 Regression] writing 1 byte into a region of
                    size 0 [-Wstringop-overflow=] since
                    r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: msebor at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: ppc64le-linux-gnu

Since the revision I see:

$ gcc/bin/ppc64le-linux-gnu-gcc suse.i -c -Wall -O2
/tmp/suse.c: In function ‘reset_tlb_mmu_ways56.constprop.isra’:
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:131:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
/tmp/suse.c:132:31: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]

[Bug tree-optimization/95490] [10/11 Regression] writing 1 byte into a region of size 0 [-Wstringop-overflow=] since r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95490

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 48664
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48664&action=edit
test-case

[Bug tree-optimization/95490] [10/11 Regression] writing 1 byte into a region of size 0 [-Wstringop-overflow=] since r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95490

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
           Keywords|                            |diagnostic
   Target Milestone|---                         |10.2

[Bug tree-optimization/95490] [10/11 Regression] writing 1 byte into a region of size 0 [-Wstringop-overflow=] since r10-5451-gef29b12cfbb4979a89b3cbadbf485a77c8fd8fce

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95490

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Blocks|                            |88443
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
This is in all likelihood a duplicate of pr95353.  The patch I posted for it
yesterday (https://gcc.gnu.org/pipermail/gcc-patches/2020-June/547124.html)
eliminates the warnings.

*** This bug has been marked as a duplicate of bug 95353 ***


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443
[Bug 88443] [meta-bug] bogus/missing -Wstringop-overflow warnings