[9fans] 8c (pcc)

[9fans] 8c (pcc)

[cej]

//1:
  result = MIN(tuplerow1[col][plane1], tuplerow2[col][plane2]);
//2:
   x=tuplerow1[col][plane1];
   y=tuplerow2[col][plane2];
   result = MIN(x, y);
   if((int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] ) 
    result =  (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2];
   else
    result =  (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];
//1:
result =  (int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] ? (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2] : (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];

//2:
   if((int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] ) 
    result =  (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2];
   else
    result =  (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];

1's die with error message : <eof> out of fixed registers, while 2's are OK.
Could someone explain, why?
Thanks, regards,
++pac.

 

Re: [9fans] 8c (pcc)

[Russ Cox]

> 1's die with error message : <eof> out of fixed registers, while 2's are OK.
> Could someone explain, why?
> Thanks, regards,
> ++pac.

apparently the register allocator used for expressions
is not doing a good job when it runs out of registers.
when you rewrote the expressions to use explicit 
temporaries, you simplified its job.

russ

Re: [9fans] 8c (pcc)

[Bruce Ellis]

i'm presuming that MIN() is the usual macro involving ? : and
that i could probably fix this - tho i have no time at the moment.
8c generally avoids running out of registers rather well, though
i dare you to follow the logic.  as ? : is not common in plan9
code and not highly regarded i guess this case was missed.

brucee

On Fri, 21 Jan 2005 02:27:56 -0500, Russ Cox <russcox@gmail.com> wrote:
> > 1's die with error message : <eof> out of fixed registers, while 2's are OK.
> > Could someone explain, why?
> > Thanks, regards,
> > ++pac.
> 
> apparently the register allocator used for expressions
> is not doing a good job when it runs out of registers.
> when you rewrote the expressions to use explicit
> temporaries, you simplified its job.
> 
> russ
>

Re: [9fans] 8c (pcc)

[Bruce Ellis]

I cant reproduce this - after trying several combinations of types.

What are the types of the variables?  This example compiles fine.
-----

#include	<u.h>
#include	<libc.h>

long	result;
long	col, plane1, plane2;
uchar	tuplerow1[100][100], tuplerow2[100][100];

void
foo(void)
{
	result = (int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] ?
(int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2] :
(int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];
}

On Fri, 21 Jan 2005 08:18:36 +0100, cej@gli.cas.cz <cej@gli.cas.cz> wrote:
> 
> //1:
>  result = MIN(tuplerow1[col][plane1], tuplerow2[col][plane2]);
> //2:
>   x=tuplerow1[col][plane1];
>   y=tuplerow2[col][plane2];
>   result = MIN(x, y);
>   if((int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] )
>    result =  (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2];
>   else
>    result =  (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];
> //1:
> result =  (int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] ? (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2] : (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];
> 
> //2:
>   if((int)tuplerow1[col][plane1] > (int)tuplerow2[col][plane2] )
>    result =  (int)tuplerow1[col][plane1] - (int)tuplerow2[col][plane2];
>   else
>    result =  (int)tuplerow2[col][plane2] - (int)tuplerow1[col][plane1];
> 
> 1's die with error message : <eof> out of fixed registers, while 2's are OK.
> Could someone explain, why?
> Thanks, regards,
> ++pac.
> 
>

[9fans] 8c(pcc)

[tapique]

pcc complains:
	sigsetjmp: DoPlot: not defined

i found the following in /sys/src/ape/lib/ap/plan9/signal.c
/* BAD CODE - see /sys/src/ape/lib/ap/$objtype/setjmp.s for real code

does it mean i need to recompile libap.a before i can use it? Or what am
i missing??

Thanks a lot,
++pac.




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Re: [9fans] 8c(pcc)

[Russ Cox]

like the comment says, the code is in /sys/src/ape/lib/ap/386/setjmp.s.

g% nm /386/lib/ape/libap.a |grep sigsetjmp
setjmp.8:         T sigsetjmp
g% 

check yours.
russ


On Mon, 7 Feb 2005 08:13:24 +0100, tapique@tiscali.cz
<tapique@tiscali.cz> wrote:
> pcc complains:
>         sigsetjmp: DoPlot: not defined
> 
> i found the following in /sys/src/ape/lib/ap/plan9/signal.c
> /* BAD CODE - see /sys/src/ape/lib/ap/$objtype/setjmp.s for real code
> 
> does it mean i need to recompile libap.a before i can use it? Or what am
> i missing??
> 
> Thanks a lot,
> ++pac.
> 
> --------------------------
> Posílejte SMS přes internet zdarma a bez reklamy. Pouze s TISCALI.
> Více na http://www.tiscali.cz
> 
>