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From: "chenglulu at loongson dot cn" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/105514] New: rv64 qsort gets wrong result when '-O2 -DDEBUG'.
Date: Sat, 07 May 2022 09:56:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105514

            Bug ID: 105514
           Summary: rv64 qsort gets wrong result when '-O2 -DDEBUG'.
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chenglulu at loongson dot cn
  Target Milestone: ---

Created attachment 52936
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52936&action=3Dedit
riscv64-linux-gnu

%riscv64-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=3Driscv64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=3D/.../libexec/gcc/riscv64-linux-gnu/13.0.0/lto-wrapper
Target: riscv64-linux-gnu
Configured with: /.../configure --target=3Driscv64-linux-gnu --with-arch=3D=
rv64g
--with-abi=3Dlp64d --enable-shared --disable-emultls --disable-bootstrap
--enable-languages=3Dc,c++,fortran --disable-multilib=20
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20220507 (experimental) (GCC)=20

There is no problem with the execution result of the following compiler.
% riscv64-linux-gnu-gcc qsort.c -o qsort -O2 --static -march=3Drv64g -mabi=
=3Dlp64d
% ./qsort
./qsort=20

But, When I add a line to the code to print,program execution result is wro=
ng.
% riscv64-linux-gnu-gcc qsort.c -o qsort -O2 --static -march=3Drv64g -mabi=
=3Dlp64d
-DDEBUG
./qsort=20





test simple_qsort array with function pointer failed.

When add option '-DDEBUG -fno-reorder-blocks', The program execution result=
 is
no problem again.=