^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Linux/PA-RISC Project (http://www.parisc-linux.org/)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Floating-point emulation code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * BEGIN_DESC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * File:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * @(#) pa/spmath/sfrem.c $Revision: 1.1 $
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Purpose:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Single Precision Floating-point Remainder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * External Interfaces:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * sgl_frem(srcptr1,srcptr2,dstptr,status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Internal Interfaces:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Theory:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * <<please update with a overview of the operation of this file>>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * END_DESC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include "float.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include "sgl_float.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Single Precision Floating-point Remainder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) sgl_frem (sgl_floating_point * srcptr1, sgl_floating_point * srcptr2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) sgl_floating_point * dstptr, unsigned int *status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) register unsigned int opnd1, opnd2, result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) register int opnd1_exponent, opnd2_exponent, dest_exponent, stepcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) register boolean roundup = FALSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) opnd1 = *srcptr1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) opnd2 = *srcptr2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * check first operand for NaN's or infinity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if ((opnd1_exponent = Sgl_exponent(opnd1)) == SGL_INFINITY_EXPONENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (Sgl_iszero_mantissa(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (Sgl_isnotnan(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* invalid since first operand is infinity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (Is_invalidtrap_enabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return(INVALIDEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) Set_invalidflag();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) Sgl_makequietnan(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *dstptr = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * is NaN; signaling or quiet?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (Sgl_isone_signaling(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* trap if INVALIDTRAP enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (Is_invalidtrap_enabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return(INVALIDEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* make NaN quiet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) Set_invalidflag();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) Sgl_set_quiet(opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * is second operand a signaling NaN?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) else if (Sgl_is_signalingnan(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* trap if INVALIDTRAP enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (Is_invalidtrap_enabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return(INVALIDEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* make NaN quiet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) Set_invalidflag();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) Sgl_set_quiet(opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) *dstptr = opnd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * return quiet NaN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *dstptr = opnd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * check second operand for NaN's or infinity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if ((opnd2_exponent = Sgl_exponent(opnd2)) == SGL_INFINITY_EXPONENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (Sgl_iszero_mantissa(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * return first operand
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) *dstptr = opnd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * is NaN; signaling or quiet?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (Sgl_isone_signaling(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* trap if INVALIDTRAP enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* make NaN quiet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) Set_invalidflag();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) Sgl_set_quiet(opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * return quiet NaN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) *dstptr = opnd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * check second operand for zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (Sgl_iszero_exponentmantissa(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* invalid since second operand is zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) Set_invalidflag();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) Sgl_makequietnan(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) *dstptr = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * get sign of result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) result = opnd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * check for denormalized operands
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (opnd1_exponent == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /* check for zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (Sgl_iszero_mantissa(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) *dstptr = opnd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* normalize, then continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) opnd1_exponent = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) Sgl_normalize(opnd1,opnd1_exponent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) Sgl_clear_signexponent_set_hidden(opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (opnd2_exponent == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* normalize, then continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) opnd2_exponent = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) Sgl_normalize(opnd2,opnd2_exponent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) Sgl_clear_signexponent_set_hidden(opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* find result exponent and divide step loop count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) dest_exponent = opnd2_exponent - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) stepcount = opnd1_exponent - opnd2_exponent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * check for opnd1/opnd2 < 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (stepcount < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * check for opnd1/opnd2 > 1/2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * In this case n will round to 1, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * r = opnd1 - opnd2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (stepcount == -1 && Sgl_isgreaterthan(opnd1,opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) Sgl_all(result) = ~Sgl_all(result); /* set sign */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* align opnd2 with opnd1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) Sgl_leftshiftby1(opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) Sgl_subtract(opnd2,opnd1,opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* now normalize */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) while (Sgl_iszero_hidden(opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) Sgl_leftshiftby1(opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) dest_exponent--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) Sgl_set_exponentmantissa(result,opnd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) goto testforunderflow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * opnd1/opnd2 <= 1/2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * In this case n will round to zero, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * r = opnd1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) Sgl_set_exponentmantissa(result,opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) dest_exponent = opnd1_exponent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) goto testforunderflow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * Generate result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * Do iterative subtract until remainder is less than operand 2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) while (stepcount-- > 0 && Sgl_all(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (Sgl_isnotlessthan(opnd1,opnd2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) Sgl_subtract(opnd1,opnd2,opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) Sgl_leftshiftby1(opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * Do last subtract, then determine which way to round if remainder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * is exactly 1/2 of opnd2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (Sgl_isnotlessthan(opnd1,opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) Sgl_subtract(opnd1,opnd2,opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) roundup = TRUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (stepcount > 0 || Sgl_iszero(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* division is exact, remainder is zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) Sgl_setzero_exponentmantissa(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) *dstptr = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * Check for cases where opnd1/opnd2 < n
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * In this case the result's sign will be opposite that of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * opnd1. The mantissa also needs some correction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) Sgl_leftshiftby1(opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (Sgl_isgreaterthan(opnd1,opnd2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) Sgl_invert_sign(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) Sgl_subtract((opnd2<<1),opnd1,opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* check for remainder being exactly 1/2 of opnd2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) else if (Sgl_isequal(opnd1,opnd2) && roundup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) Sgl_invert_sign(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /* normalize result's mantissa */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) while (Sgl_iszero_hidden(opnd1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) dest_exponent--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) Sgl_leftshiftby1(opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) Sgl_set_exponentmantissa(result,opnd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Test for underflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) testforunderflow:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (dest_exponent <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* trap if UNDERFLOWTRAP enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (Is_underflowtrap_enabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * Adjust bias of result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) Sgl_setwrapped_exponent(result,dest_exponent,unfl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) *dstptr = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) /* frem is always exact */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return(UNDERFLOWEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * denormalize result or set to signed zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (dest_exponent >= (1 - SGL_P)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) Sgl_rightshift_exponentmantissa(result,1-dest_exponent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) Sgl_setzero_exponentmantissa(result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) else Sgl_set_exponent(result,dest_exponent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) *dstptr = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return(NOEXCEPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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