[Bug tree-optimization/92683] [10 Regression] strncmp incorrect result with equal substrings and non-const bound

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92683

Rainer Orth <ro at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |ro at gcc dot gnu.org
         Resolution|FIXED                       |---

--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> ---
The new gcc.dg/strcmpopt_8.c test FAILs on 64-bit i386-pc-solaris2.11,
sparc-sun-solaris2.11, and (according to gcc-testresults)
powerpc-apple-darwin9:

+FAIL: gcc.dg/strcmpopt_8.c (test for excess errors)
+FAIL: gcc.dg/strcmpopt_8.c scan-tree-dump-not forwprop1 "strncmp"

Excess errors:
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/strcmpopt_8.c:22:15: warning:
'__builtin_strncmp' specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]