[Bug testsuite/102944] New: Many gcc.dg/Wstringop-overflow-*.c failures

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102944

            Bug ID: 102944
           Summary: Many gcc.dg/Wstringop-overflow-*.c failures
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: crazylht at gmail dot com
  Target Milestone: ---
            Target: sparc-sun-solaris2.11, m68k-unknown-linux-gnu,
                    moxie-unknown-elf, aarch64-suse-linux-gnu,
                    mipsel-mti-elf, arm-none-linux-gnueabihf

Between 20211019 (ff0eec94e87dfb7dc387f120ca5ade2707aecf50) and 20211020
(d98626bf451dea6a28a42d953f7d0bd7659ad4d5),
quite a number of testsuite failures occured.  I'm seeing them on Solaris/SPARC
(32 and 64-bit), but gcc-testresults show reports for many others:

+FAIL: gcc.dg/Warray-parameter-3.c pr102706 (test for warnings, line 80)
+FAIL: gcc.dg/Wstringop-overflow-14.c pr102706 (test for warnings, line 39)
+XPASS: gcc.dg/Wstringop-overflow-14.c pr102706 (test for warnings, line 40)
+FAIL: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line 68)
+FAIL: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line 69)
+XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line 70)
+XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line 71)
+XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line 72)
+XPASS: gcc.dg/Wstringop-overflow-76.c note (test for warnings, line 107)
+XPASS: gcc.dg/Wstringop-overflow-76.c note (test for warnings, line 86)
+XPASS: gcc.dg/Wstringop-overflow-76.c pr102697 (test for warnings, line 119)
+XPASS: gcc.dg/Wstringop-overflow-76.c pr102697 (test for warnings, line 99)
+FAIL: gcc.dg/Wstringop-overflow-76.c pr102706 (test for warnings, line 30)
+XPASS: gcc.dg/Wstringop-overflow-76.c pr102706 (test for warnings, line 33)
+FAIL: gcc.dg/Wstringop-overflow-76.c pr102706 (test for warnings, line 47)
+XPASS: gcc.dg/Wstringop-overflow-76.c pr102706 (test for warnings, line 50)

AFAICS they are due to

commit 3c8d8c0be95e99dc0cba7f6fad2429243582119f
Author: liuhongt <hongtao.liu@intel.com>
Date:   Thu Oct 14 09:31:03 2021 +0800

    Adjust testcase for O2 vectorization.