https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88239
Bug ID: 88239
Summary: ./gcc.dg/torture/pr84929.c with -O3 -march=native
causes ubsan error
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: ---
From the gcc testsuite, file ./gcc.dg/torture/pr84929.c,
compiled with a ubsan version of recent gcc trunk, and
compiler flags -c -O3 -march=native, does this:
$ ~/gcc/results/bin/gcc -c -O3 -march=native ./gcc.dg/torture/pr84929.c
../../trunk/gcc/poly-int.h:753:21: runtime error: signed integer overflow:
-5621332293356458048 * 8 cannot be represented in type 'long int'
../../trunk/gcc/tree-ssa-loop-prefetch.c:468:14: runtime error: signed integer
overflow: 7818038963515661296 * 4 cannot be represented in type 'long int'
$
The error about poly-int.h occurs in many source code files
and should be ignored. It is the second runtime error I noticed.
This bug seems to have existed since sometime before revision 265631.
/proc/cpuinfo says
vendor_id : AuthenticAMD
cpu family : 21
model : 2
model name : AMD FX(tm)-8350 Eight-Core Processor
