Fortran 300 times faster than C for computing cosine

[Joerg Schilling]

The sun C compiles does convert calls to the *external* c function sin() ...
into 68881 routines if you tell him to use the inline expander.

Try the folling c program (t.c):

extern double sin();

double t()
{
        return sin(123.0);
}


use the command :
joerg > cc -v -O2 -f68881 -S /usr/lib/f68881/libm.il t.c
..
Verbose output removed.
joerg > cat t.s
..
Several lines removed.
        .text
        .globl  _t
_t:
|#PROLOGUE# 0
        link    a6,#-8
|#PROLOGUE# 1
        movl    L2000000+4,sp at -
        movl    L2000000,sp at -
        fsind   sp@,fp0
        fmoved  fp0,sp@
        movl    sp at +,a6@(-8)
        movl    sp at +,a6@(-4)
        movl    a6@(-8),d0
        movl    a6@(-4),d1
|#PROLOGUE# 2
        unlk    a6
|#PROLOGUE# 3
        rts
L2000000:
        .long   1079951360,0
joerg >

As you see the call to the *external* function is converted into the
correct mc68881 code.  See the manual of inline(1) for more information.

        J. Schilling
        H. Berthold AG
        Teltowkanalstr. 1-4
        D 1000 Berlin 46
        +49 30  7795 - 400


joerg at berthold.de
.. tub!berthold!joerg
.. unido!berthold!joerg