Re: [PATCH GCC8][01/33]Handle TRUNCATE between tieable modes in rtx_cost

["Bin.Cheng" <amker.cheng@gmail.com>]

On Wed, May 3, 2017 at 7:17 AM, Eric Botcazou <ebotcazou@adacore.com> wrote:
>> 2017-04-11  Bin Cheng  <bin.cheng@arm.com>
>>
>>       * rtlanal.c (rtx_cost): Handle TRUNCATE between tieable modes.
>
> This breaks bootstrap with RTL checking:
>
> /home/eric/build/gcc/native/./gcc/xgcc -B/home/eric/build/gcc/native/./gcc/ -
> nostdinc -x c /dev/null -S -o /dev/null -fself-
> test=/home/eric/svn/gcc/gcc/testsuite/selftests
> cc1: internal compiler error: RTL check: expected code 'subreg', have
> 'truncate' in rtx_cost, at rtlanal.c:4169
> 0xbae338 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
> char const*)
>         /home/eric/svn/gcc/gcc/rtl.c:829
> 0xbbc9b4 rtx_cost(rtx_def*, machine_mode, rtx_code, int, bool)
>         /home/eric/svn/gcc/gcc/rtlanal.c:4169
> 0x8517e6 set_src_cost
>         /home/eric/svn/gcc/gcc/rtl.h:2685
> 0x8517e6 init_expmed_one_conv
>         /home/eric/svn/gcc/gcc/expmed.c:142
> 0x8517e6 init_expmed_one_mode
>         /home/eric/svn/gcc/gcc/expmed.c:209
> 0x853fb2 init_expmed()
>         /home/eric/svn/gcc/gcc/expmed.c:270
> 0xc45974 backend_init_target
>         /home/eric/svn/gcc/gcc/toplev.c:1665
> 0xc45974 initialize_rtl()
>
Sorry for disturbing, I will revert this if can't fix today.

Thanks,
bin
> --
> Eric Botcazou