Question On Floating Point In Gcc For Solaris Sparc

[Thomas Dineen]

Gentle people:

A question: in Gcc for Solaris Sparc is there any initialization
required previous to the execution of Floating Point Instructions
in a program?

Inspection of the _start function implies that there is! Can anybody
explain the details?

Thanks for the help.
Thomas Dineen

[Dave (from the UK)]

What do you mean by 'initialization'? Here's a program that does a bit
of floating point maths. Nothing more/less than one would have in any
other C program. I must be missing the point somewhere.

sparrow /export/home/drkirkby % cat test.c

#include <stdio.h>
#include <math.h>
main() {
printf("The sine of 45 degrees is %lf\n",sin(45*M_PI/180));
}

sparrow /export/home/drkirkby % gcc -lm test.c
sparrow /export/home/drkirkby % ./a.out
The sine of 45 degrees is 0.707107

--
Dave (from the UK)

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[Paul Floyd]

["Followup-To:" header set to comp.unix.solaris.]

On Tue, 25 Sep 2007 11:13:57 -0700, Thomas Dineen <tjjd...@comcast.net> wrote:
> Gentle people:
>
> A question: in Gcc for Solaris Sparc is there any initialization
> required previous to the execution of Floating Point Instructions
> in a program?
>
> Inspection of the _start function implies that there is! Can anybody
> explain the details?

Much depends on which "instructions" you are going to be using.
I'm not sure where your "_start" function comes from. Please explain
further.

In general, I wouldn't be surprised if mathematical libraries (including
libm) require some initialization. But that should be all taken care of
under the covers. For everyday maths, you shouldn't need to do anything.

A bientot
Paul
--
Paul Floyd http://paulf.free.fr