🚀 go-pugleaf

In article <165100001@uiucdcsb> robison@uiucdcsb.cs.uiuc.edu writes:
>
>I've heard of another scheme, but never tried it:
>
>Code generation emits a call to a floating point library.
>If the FP hardware is available, the library routine changes 
>(at run time) the call instruction to the equivalent hardware 
>instruction.  This way you pay for the subroutine linkage only 
>on the first call. The disadvantage is that self-modifying code 
>is not allowed on some architectures.

One would not have that problem if one patched the program as it
was brought into memory, rather than on the first library call.
But I doubt that anyone really wants to generate code that *assumes*
that emulation libraries are in use.

Kevin D. Kissell
Fairchild Advanced Processor Division
uucp: {ihnp4, decwrl, ucbvax}!hplabs!harvax!garth!kissell

Disclaimer: All opinions expressed herein are either
            my own or a product of your imagination.