Re: [Tinycc-devel] alinged/unaligned on OpenBSD

[Herman ten Brugge]

On 1/28/21 9:27 AM, grischka wrote:

> Herman
>       ten Brugge wrote:
>       
> > I implemented load/store bytes for packed
> >         structs in tcc (see attachment).
> >         
> >         Can I push it to mob?
> >         
> >       
>       
>       Did you test this?  What happens if you enable this for
>       
>       any structs
>       
>           //#ifdef TCC_TARGET_ARM
>       
>                      //if (packed)
>       
>                           f->type.t |= VT_PACKED;
>       
>           //#endif
>       
>       and run the tests?
>       
>     
    I did test this on arm32 openbsd. This is where the problem was.
    However the above patch fails. I will provide a new patch.
    I need to add support float/double/long double/pointers for this to
    work.
>       
>       Btw, do we really need all these gen_increment_tcov ()'s?
>       
>       Can't we just use the inc(0, TOK_INC) for all targets?
>       
>       
>     
    I did some measurements.
    Compile tcc with itself 100 times with test coverage. (times in
    seconds):
    
             function
      TOK_INC  slowdown
      x86_64      11.28   14.09       25%
      i386        14.80   18.08       22%
      arm32      233.53  415.94       78%
      arm64       83.53  104.47       25%
      riscv64     26.70   28.48        7%   (qemu 10 times)
    
    I did this because I saw a large slowdown.
    The risc target is measured in qemu so not that reliable.
    
        Herman