home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Atari Compendium
/
The Atari Compendium (Toad Computers) (1994).iso
/
files
/
umich
/
falcon
/
programm.ing
/
nt_dsp1.lzh
/
NT_DSP1.MSA
/
FLOAT
/
FPCEIL.ASM
< prev
next >
Wrap
Assembly Source File
|
1989-01-24
|
2KB
|
74 lines
fpceil ident 2,0
;
; MOTOROLA DSP56000/1 FPLIB - VERSION 2
;
; This program, originally available on the Motorola DSP bulletin board,
; is provided under a DISCLAIMER OF WARRANTY available from Motorola DSP
; Operation, 6501 William Cannon Drive, West, Austin, Texas 78735-8598.
;
; FPCEIL - FLOATING POINT CEIL SUBROUTINE
;
; Entry points: fceil_a R = ceil(A)
; fceil_x R = ceil(X)
;
; m = 24 bit mantissa (two's complement, normalized fraction)
;
; e = 14 bit exponent (unsigned integer, biased by +8191)
;
; Input variables:
;
; X x1 = mx (normalized)
; x0 = ex
;
; A a2 = sign extension of ma
; a1 = ma (normalized)
; a0 = zero
;
; b2 = sign extension of ea (always zero)
; b1 = ea
; b0 = zero
;
; Output variables:
;
; R a2 = sign extension of mr
; a1 = mr (normalized)
; a0 = zero
;
; b2 = sign extension of er (always zero)
; b1 = er
; b0 = zero
;
; Error conditions: No error conditions are signaled.
;
; Assumes n0, m0, shift constant table and scaling modes
; initialized by previous call to the subroutine "fpinit".
;
; Alters Data ALU Registers
; a2 a1 a0 a
; b2 b1 b0 b
; x1 x0
;
; Alters Address Registers
; r0
;
; Alters Program Control Registers
; pc sr
; ssh ssl sp
;
; Uses 1 location on System Stack
;
; Version - 2.0
; Latest Revision - February 22, 1988
;
fceil_x tfr x0,b x1,a ;get mx,ex
fceil_a
neg a ;reverse number line
jsr floor_a ;do floor operation
neg a ;reverse number line
rts