boesch@Shasta.STANFORD.EDU (Brian Boesch) (07/15/87)
---- We have SCO Xenix 286 and I would likt to know it the C compiler supports the 287 coprocessor. I looked in the manuals and there is no mention of the coprocessor in the CC sections of the manual. Brian Boesch boesch@shasta.stanford.edu boesch@shasta.uucp
ericg@sco.UUCP (Eric Griswold) (07/15/87)
In article <1859@Shasta.STANFORD.EDU> boesch@Shasta.UUCP (Brian Boesch) writes: > >---- > >We have SCO Xenix 286 and I would likt to know it the C compiler supports >the 287 coprocessor. I looked in the manuals and there is no mention of >the coprocessor in the CC sections of the manual. > >Brian Boesch Absolutely. The C compiler generates code, that is smart enough to use a coprocessor if it present or use the software emulator if it is not. In other words, one generally need not worry about the presence of a coprocessor. If it is present, your program will use it, ifj it isn't the operating system will simulate it. -- Eric Griswold Quote: 3 more of these will make a gallon Path: {decvax!microsoft, ihnp4, ucbvax!ucscc}!sco!ericg Disclaimer: It's all my fault, SCO had NOTHING to do with it.
davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr) (07/15/87)
In article <1859@Shasta.STANFORD.EDU> boesch@Shasta.UUCP (Brian Boesch) writes: |We have SCO Xenix 286 and I would likt to know it the C compiler supports |the 287 coprocessor. I looked in the manuals and there is no mention of |the coprocessor in the CC sections of the manual. Yes. Do a compile of a short routine and look at the code. Ex: $ cat > x.c main() { float a,b,c; c = a*b; } ^D $ cc -c -Fc x.c $ more x.L -- bill davidsen (wedu@ge-crd.arpa) {chinet | philabs | sesimo}!steinmetz!crdos1!davidsen "Stupidity, like virtue, is its own reward" -me
chkg@ptsfa.UUCP (Chuck Gentry) (07/15/87)
In article <1859@Shasta.STANFORD.EDU> boesch@Shasta.UUCP (Brian Boesch) writes: > >---- > >We have SCO Xenix 286 and I would likt to know it the C compiler supports >the 287 coprocessor. I looked in the manuals and there is no mention of >the coprocessor in the CC sections of the manual. > The 8087, 80287, and 80387 are all supported by the related version of XENIX. I believe that it is the kernel that provides the floating point support. The compiler "assumes" that the coprocessor exists in the system when generating code. If no coprocessor is present, the kernel will emulate the routine. If a coprocessor is present, the floating point instruction is executed. (Makes your code portable between machines.) The coprocessor is mentioned in the manual: "Run Time Environment", Operating System Release Notes. Depending on your version, you'll find the info on: V2.1.0 Page 8, V2.2.1 Page 43. During boot time, Xenix will tell you if a math coprocessor is present. (There are also references in the Hardware Dependent Misc. section, and the MASM section in Programmer's Guide, system development tools, User's section 2-5. It seems my copy does not have these pages. They are mentioned in various places in the manual.) Chuck Gentry {lll-lcc,quantel,ihnp4}!ptsfa!pbcesar!chkg