adding sccsid asciz string to each source file.

[unix-history] / usr / src / lib / libm / vax / sincos.s

# 
# Copyright (c) 1985 Regents of the University of California.
# 
# Use and reproduction of this software are granted  in  accordance  with
# the terms and conditions specified in  the  Berkeley  Software  License
# Agreement (in particular, this entails acknowledgement of the programs'
# source, and inclusion of this notice) with the additional understanding
# that  all  recipients  should regard themselves as participants  in  an
# ongoing  research  project and hence should  feel  obligated  to report
# their  experiences (good or bad) with these elementary function  codes,
# using "sendbug 4bsd-bugs@BERKELEY", to the authors.
#
       .data
       .align  2
_sccsid:
.asciz  "@(#)sincos.s   1.1 (Berkeley) 8/21/85; 1.3 (ucb.elefunt) %G%"

#  This is the implementation of Peter Tang's double precision  
#  sine and cosine for the VAX using Bob Corbett's argument reduction.
#  
#  Notes:
#       under 1,024,000 random arguments testing on [0,2*pi] 
#       sin() observed maximum error = 0.814 ulps
#       cos() observed maximum error = 0.792 ulps
#
# double sin(arg)
# double arg;
# method: true range reduction to [-pi/4,pi/4], P. Tang  &  B. Corbett
# S. McDonald, April 4,  1985
#
       .globl  _sin
       .text
       .align  1

_sin:   .word   0xffc           # save r2-r11
       movq    4(ap),r0
       bicw3   $0x807f,r0,r2
       beql    1f              # if x is zero or reserved operand then return x
#
# Save the PSL's IV & FU bits on the stack.
#
       movpsl  r2
       bicw3   $0xff9f,r2,-(sp)
#
# Clear the IV & FU bits.
#
       bicpsw  $0x0060
#
#  Entered by  sine    ; save  0  in  r4 .
#
       jsb     libm$argred
       movl    $0,r4
       jsb     libm$sincos
       bispsw  (sp)+
1:      ret

#
# double cos(arg)
# double arg;
# method: true range reduction to [-pi/4,pi/4], P. Tang  &  B. Corbett
# S. McDonald, April 4,  1985
#
       .globl  _cos
       .text
       .align  1

_cos:   .word   0xffc           # save r2-r11
       movq    4(ap),r0
       bicw3   $0x7f,r0,r2
       cmpw    $0x8000,r2
       beql    1f              # if x is reserved operand then return x
#
# Save the PSL's IV & FU bits on the stack.
#
       movpsl  r2
       bicw3   $0xff9f,r2,-(sp)
#
# Clear the IV & FU bits.
#
       bicpsw  $0x0060
#
#  Entered by  cosine  ; save  1  in  r4 .
#
       jsb     libm$argred
       movl    $1,r4
       jsb     libm$sincos
       bispsw  (sp)+
1:      ret