C optimizer

[Vick Khera]

In article <9693 at smoke.BRL.MIL> gwyn at brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>In article <1026 at frog.UUCP> john at frog.UUCP (John Woods) writes:
>>The 68881 chip has FCOS, FSIN, and (gasp) FSINCOS which simultaneously
>>computes cos() and sin() of the same argument.  A sufficiently clever
>>compiler could potentially make great use of that.
>
>Well, hurray -- I've wanted that for years!  I do hope C implementors
>will perform this optimization; it could help us computer-graphics types
>quite a bit.

The Sun 3 C compiler will use the intrinsic functions of the 68881 chip if
you tell it to compile with the f68881.il inline-expansion file. i beilieve
it is located in /usr/lib/f68881/libm.il under 4.0, and in
/usr/lib/f68881.il in 3.x.

example compile line:

cc -o prog prog.c /usr/lib/f68881.il

						vick.
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