[m-dev.] Building Mercury in i386

[Julien Fischer]

Hi Paul,

On Fri, 1 Jul 2011, Paul Bone wrote:

>
> Hi Guys.
>
> Has anyone built Mercury on i386 lately.  I'm building on an i386 Debian squeeze system..  I get this:
>
> ../scripts/mgnuc --grade asm_fast.gc        --      -c ml_backend.ml_closure_gen.c -o ml_backend.ml_closure_gen.o
> ml_backend.ml_closure_gen.c: In function 'ml_backend__ml_closure_gen_module11':
> ml_backend.ml_closure_gen.c:2985: error: unable to find a register to spill in class 'DIREG'
> ml_backend.ml_closure_gen.c:2985: error: this is the insn:
> (insn 123 122 124 11 ml_backend.ml_closure_gen.c:2860 (parallel [
>            (set (mem:SI (reg/f:SI 136) [0 S4 A32])
>                (reg/v:SI 1 dx [orig:80 MR_tempr3 ] [80]))
>            (set (reg/v:SI 82 [ MR_tempr1 ])
>                (plus:SI (reg/f:SI 136)
>                    (const_int 4 [0x4])))
>        ]) 852 {*strsetsi_1} (expr_list:REG_DEAD (reg/f:SI 136)
>        (nil)))
> ml_backend.ml_closure_gen.c:2985: confused by earlier errors, bailing out
> Preprocessed source stored into /tmp/cckqSgyE.out file, please attach this to your bugreport.
>
> This is ROTD 2011-06-23, I'm using gcc (Debian 4.4.5-8) 4.4.5

Yes, Sebastian bumped into it the other day.  (Probably, some GCC
optimization is not playing nicely with the global registers extension,
you may be able to work around it by tweaking the C compiler flags --
this tends to be a problem on i386 because there aren't many registers
available in the first place.)

> This is probably relevent for the release.

Yes, we will need identify the versions of GCC that exhibit this problem
and find workarounds for it.

Cheers,
Julien.
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