[Valgrind-users] float cast

[ragnar s. <rag...@po...>]

Thanks for the help, I've upgraded to 1.9.6,
but valgrind still gives the same result.

Considering the following code:
int
main (int argc, char **argv)
{
float e;

  e = 0;
  e = e * (float)0.7;

  return 0;
}


Gcc treats:
float e;
  e = e * 0.7;
differently from :
e = e * (float)0.7;

As is shown in this assembler output,
when toggling first with the (float) cast
then without:
---------------
.section        .rodata
        .align 4
.LC0:
        .long 0x3f333333
.text
        .align 4
<snip>
        flds .LC0
        fmulp %st,%st(1)

--------------

.section        .rodata
        .align 8
.LC0:
        .long 0x66666666,0x3fe66666
.text
        .align 4
<snip>
        fldl .LC0
        fmulp %st,%st(1)
-------

My guess is the first assembler output
is using single-precision, and the second
defaults to double ?

So the func.c/prog.c should use double-precision correctly I assume ?

Still, is there a error in the func.c/prog.c program, that valgrind thinks ?

thanks
Ragnar


___________________________________________________ 
Who invented the Centigrade scale of temperature? 

Find out at postmaster.co.uk

http://www.postmaster.co.uk/cgi-bin/meme/quiz.pl?id=196