RE: [PATCH] RISC-V: Add mode switching target hook to insert rounding mode config for fixed-point instructions

["Li, Pan2" <pan2.li@intel.com>]

Hi Andreas,

Could you please help to share more information about how to trigger this error? As you don't mentioned, I assume below error comes from X86 build. I take below configuration but failed to reproduce.

mkdir __BUILD_X86 && cd __BUILD_X86
../configure --enable-language=c,c++   --enable-bootstrap   --disable-multilib --prefix=`pwd`/../__INSTALL_X86

make -j $(nproc) && make install

Pan


-----Original Message-----
From: Gcc-patches <gcc-patches-bounces+pan2.li=intel.com@gcc.gnu.org> On Behalf Of Andreas Schwab
Sent: Friday, May 19, 2023 6:41 PM
To: juzhe.zhong@rivai.ai
Cc: gcc-patches@gcc.gnu.org; kito.cheng@gmail.com; kito.cheng@sifive.com; palmer@dabbelt.com; palmer@rivosinc.com; jeffreyalaw@gmail.com; rdapp.gcc@gmail.com
Subject: Re: [PATCH] RISC-V: Add mode switching target hook to insert rounding mode config for fixed-point instructions

In function 'int optimize_mode_switching()',
    inlined from 'virtual unsigned int {anonymous}::pass_mode_switching::execute(function*)' at ../../gcc/mode-switching.cc:909:31:
../../gcc/mode-switching.cc:608:29: error: 'bb_info$' may be used uninitialized [-Werror=maybe-uninitialized]
  608 |                 add_seginfo (info + bb->index, ptr);
      |                 ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
../../gcc/mode-switching.cc: In member function 'virtual unsigned int {anonymous}::pass_mode_switching::execute(function*)':
../../gcc/mode-switching.cc:503:19: note: 'bb_info$' was declared here
  503 |   struct bb_info *bb_info[N_ENTITIES];
      |                   ^~~~~~~
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:1174: mode-switching.o] Error 1

--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1 "And now for something completely different."