https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109780
Bug ID: 109780
Summary: csmith: runtime crash with -O2 -march=znver1
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Created attachment 55023
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55023&action=edit
C source code
The attached C code seems to work fine with -O2:
$ ../results.20230507.asan.ubsan/bin/gcc -w -O2 bug916.c
$ ./a.out
checksum = 44DCF65B
$
But adding -march=znver1 seems to cause trouble:
$ ../results.20230507.asan.ubsan/bin/gcc -w -O2 -march=znver1 bug916.c
$ ./a.out
Segmentation fault (core dumped)
$
Adding the -fno-strict-aliasing flag doesn't seem to help:
$ ../results.20230507.asan.ubsan/bin/gcc -w -O2 -march=znver1
-fno-strict-aliasing bug916.c
$ ./a.out
Segmentation fault (core dumped)
$
The bug seems to have existed for a while:
$ ../results.20230417/bin/gcc -w -O2 -march=znver1 -fno-strict-aliasing
bug916.c
$ ./a.out
Segmentation fault (core dumped)
$
