projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1f0502d3 KB |
1 | /* |
| 2 | * Copyright (c) 1986 Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Computer Consoles Inc. | |
| 7 | * | |
| 019bea33 | 8 | * %sccs.include.redist.c% |
| 1f0502d3 KB |
9 | */ |
| 10 | ||
| 11 | #if defined(SYSLIBC_SCCS) && !defined(lint) | |
| 019bea33 | 12 | .asciz "@(#)negf.s 1.3 (Berkeley) %G%" |
| 1f0502d3 | 13 | #endif /* SYSLIBC_SCCS and not lint */ |
| b9f214cf SL |
14 | |
| 15 | #include <tahoemath/fp.h> | |
| 16 | #include "DEFS.h" | |
| 17 | ||
| 18 | XENTRY(negf, 0) | |
| 19 | clrl r1 | |
| 20 | andl3 $EXPMASK,4(fp),r0 /* check for reserved operand,zero. */ | |
| 21 | beql isreserved | |
| 22 | movl 4(fp),r0 /* fetch operand. */ | |
| 23 | bbc $31,r0,seton | |
| 24 | andl2 $(0!SIGNBIT),r0 /* turn it off. */ | |
| 25 | ret | |
| 26 | seton: orl2 $SIGNBIT,r0 /* turn it on. */ | |
| 27 | ret | |
| 28 | isreserved: | |
| 29 | bbc $31,4(fp),retzero | |
| 30 | callf $4,sfpresop | |
| 31 | ret | |
| 32 | retzero: | |
| 33 | clrl r0 | |
| 34 | ret |