https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115154
Bug ID: 115154
Summary: [13/14 Regression] wrong code at optimization levels
-O2, -O3, -Os
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: bic60176 at gmail dot com
Target Milestone: ---
Created attachment 58242
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58242&action=edit
testcase
OS: Ubuntu 22.04.3 LTS
We found that there are discrepancies when compiling with gcc-13.2.0,
gcc-14.1.0 at optimization levels -O2, -O3, and -Os.
$ ../compiler-builds/gcc-13.2.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s
-I/home/csmith/include/csmith-2.3.0 -O2 testcase.c -o exec
$ timeout 1s ./exec 2>exec.err
f.b=0
$ ../compiler-builds/gcc-12.3.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s
-I/home/csmith/include/csmith-2.3.0 -O2 testcase.c -o exec
$ timeout 1s ./exec 2>exec.err
f.b=-1
