https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87868
Bug ID: 87868
Summary: testsuite/c-c++-common/pr60101.c with -O3 and ubsan
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Compiling -c++-common/pr60101.c from the gcc/testsuite with
flag -O3 on a recent version of ubsan gcc trunk does this:
$ ~/gcc/results.265631.ubsan/bin/gcc -c -g -O3 ./c-c++-common/pr60101.c
../../trunk/gcc/postreload-gcse.c:1174:45: runtime error: signed integer
overflow: 10 * 2304690102552494078 cannot be represented in type 'long int'
Interestingly, no problem with -O2:
$ ~/gcc/results.265631.ubsan/bin/gcc -c -g -O2 ./c-c++-common/pr60101.c
$
postreload-gcse.c source code is
if (ok_count.to_gcov_type ()
< GCSE_AFTER_RELOAD_CRITICAL_FRACTION * critical_count.to_gcov_type ())
goto cleanup;
and svn blame says
248863 hubicka if (ok_count.to_gcov_type ()
248863 hubicka < GCSE_AFTER_RELOAD_CRITICAL_FRACTION *
critical_count.to_gcov_type ())
