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List:       gcc-bugs
Subject:    [Bug target/113689] New: wrong code with unused _BitInt() division with -O2 -fprofile -mcmodel=large
From:       zsojka at seznam dot cz via Gcc-bugs <gcc-bugs () gcc ! gnu ! org>
Date:       2024-01-31 20:32:59
Message-ID: bug-113689-4 () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113689

            Bug ID: 113689
           Summary: wrong code with unused _BitInt() division with -O2
                    -fprofile -mcmodel=large -mavx
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 57270
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57270&action=edit
reduced testcase

Output:
$ x86_64-pc-linux-gnu-gcc -O2 -fprofile -mcmodel=large -mavx testcase.c
$ ./a.out 
Aborted

"b" (and then "x") seems to be garbage.




$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-8665-20240131161256-g3fed1609f61- \
checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.1/lto-wrapper
                
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-8665-20240131161256-g3fed1609f61-checking-yes-rtl-df-extra-nobootstrap-amd64
 Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240131 (experimental) (GCC)=


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