diff options
Diffstat (limited to 'contrib/ntp/libntp/mfp_mul.c')
| -rw-r--r-- | contrib/ntp/libntp/mfp_mul.c | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/contrib/ntp/libntp/mfp_mul.c b/contrib/ntp/libntp/mfp_mul.c deleted file mode 100644 index 0c667f7..0000000 --- a/contrib/ntp/libntp/mfp_mul.c +++ /dev/null @@ -1,140 +0,0 @@ -/* - * /src/NTP/ntp-4/libntp/mfp_mul.c,v 4.3 1999/02/21 12:17:37 kardel RELEASE_19990228_A - * - * $Created: Sat Aug 16 20:35:08 1997 $ - * - * Copyright (C) 1997, 1998 by Frank Kardel - */ -#include <stdio.h> -#include "ntp_stdlib.h" -#include "ntp_types.h" -#include "ntp_fp.h" - -#define LOW_MASK (u_int32)((1<<(FRACTION_PREC/2))-1) -#define HIGH_MASK (u_int32)(LOW_MASK << (FRACTION_PREC/2)) - -void -mfp_mul( - int32 *o_i, - u_int32 *o_f, - int32 a_i, - u_int32 a_f, - int32 b_i, - u_int32 b_f - ) -{ - int32 i, j; - u_int32 f; - u_long a[4]; /* operand a */ - u_long b[4]; /* operand b */ - u_long c[4]; /* result c */ - - int neg = 0; - - if (a_i < 0) /* examine sign situation */ - { - neg = 1; - M_NEG(a_i, a_f); - } - - if (b_i < 0) /* examine sign situation */ - { - neg = !neg; - M_NEG(b_i, b_f); - } - - a[0] = a_f & LOW_MASK; /* prepare a operand */ - a[1] = (a_f & HIGH_MASK) >> (FRACTION_PREC/2); - a[2] = a_i & LOW_MASK; - a[3] = (a_i & HIGH_MASK) >> (FRACTION_PREC/2); - - b[0] = b_f & LOW_MASK; /* prepare b operand */ - b[1] = (b_f & HIGH_MASK) >> (FRACTION_PREC/2); - b[2] = b_i & LOW_MASK; - b[3] = (b_i & HIGH_MASK) >> (FRACTION_PREC/2); - - c[0] = c[1] = c[2] = c[3] = 0; - - for (i = 0; i < 4; i++) /* we do assume 32 * 32 = 64 bit multiplication */ - for (j = 0; j < 4; j++) - { - u_long result_low, result_high; - - result_low = (u_long)a[i] * (u_long)b[j]; /* partial product */ - - if ((i+j) & 1) /* splits across two result registers */ - { - result_high = result_low >> (FRACTION_PREC/2); - result_low <<= FRACTION_PREC/2; - } - else - { /* stays in a result register - except for overflows */ - result_high = 0; - } - - if (((c[(i+j)/2] >> 1) + (result_low >> 1)) & (u_int32)((unsigned)1<<(FRACTION_PREC - 1))) - result_high++; /* propagate overflows */ - - c[(i+j)/2] += result_low; /* add up partial products */ - - if (((c[(i+j+1)/2] >> 1) + (result_high >> 1)) & (u_int32)((unsigned)1<<(FRACTION_PREC - 1))) - c[1+(i+j)/2]++; /* propagate overflows */ - - c[(i+j+1)/2] += result_high; - } - -#ifdef DEBUG - if (debug > 6) - printf("mfp_mul: 0x%04lx%04lx%04lx%04lx * 0x%04lx%04lx%04lx%04lx = 0x%08lx%08lx%08lx%08lx\n", - a[3], a[2], a[1], a[0], b[3], b[2], b[1], b[0], c[3], c[2], c[1], c[0]); -#endif - - if (c[3]) /* overflow */ - { - i = ((unsigned)1 << (FRACTION_PREC-1)) - 1; - f = ~(unsigned)0; - } - else - { /* take produkt - discarding extra precision */ - i = c[2]; - f = c[1]; - } - - if (neg) /* recover sign */ - { - M_NEG(i, f); - } - - *o_i = i; - *o_f = f; - -#ifdef DEBUG - if (debug > 6) - printf("mfp_mul: %s * %s => %s\n", - mfptoa((u_long)a_i, a_f, 6), - mfptoa((u_long)b_i, b_f, 6), - mfptoa((u_long)i, f, 6)); -#endif -} - -/* - * mfp_mul.c,v - * Revision 4.3 1999/02/21 12:17:37 kardel - * 4.91f reconcilation - * - * Revision 4.2 1998/12/20 23:45:28 kardel - * fix types and warnings - * - * Revision 4.1 1998/05/24 07:59:57 kardel - * conditional debug support - * - * Revision 4.0 1998/04/10 19:46:38 kardel - * Start 4.0 release version numbering - * - * Revision 1.1 1998/04/10 19:27:47 kardel - * initial NTP VERSION 4 integration of PARSE with GPS166 binary support - * - * Revision 1.1 1997/10/06 21:05:46 kardel - * new parse structure - * - */ |
