Re: [microblaze-uclinux] param passing float

[Yasushi SHOJI <yashi@xxxxxxxxxxxxxxxxx>]

Hi John,

At Tue, 17 Aug 2004 14:20:18 +1000,
John Williams wrote:
> 
> Hi Yashi,
> 
> Yasushi SHOJI wrote:
> > I've benn tring to figure out this weird symptoms. I've been testing
> > with John's latest toolchain and Xilinx's EDK 6.2. both prints:
> > 
> > now what I can't compile is this:
> > 
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <string.h>
> > 
> > int main()
> > {
> >         char buf[1024];
> >         sprintf(buf, "%.*g\n\n", 15, 1.0);
> >         printf("%s\n", buf);
> >         gcvt(1.0, 15, buf);
> >         printf("%s\n", buf);
> >         return 0;
> > }
> > 
> > 
> > if I comment out gcvt() line, it seems like it compiles fine and work
> > as I expected.
> 
> This program compiles cleanly for me using the out-of-tree compile 
> instructions that you wrote.  It runs, but the result looks ilke garbage.
> 
> What's the error if you include the gcvt line?

oops, that's a bug in my wording ;P   I can compile, but as you said
result is garbage. is this know bug?

if you disassemble, main() is tring to pass float to gcvt, but
register assignment is a bit odd.  hmm... i'll try in-tree compile to
see whether it works or not.

btw, is there any ABI doc about float and double?  do i need any
option to pass float/double to a function?

best,
--
            yashi
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