1 /* Machine-dependent software floating-point definitions. 2 S/390 kernel version. 3 Copyright (C) 1997,1998,1999 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 Contributed by Richard Henderson (rth@cygnus.com), 6 Jakub Jelinek (jj@ultra.linux.cz), 7 David S. Miller (davem@redhat.com) and 8 Peter Maydell (pmaydell@chiark.greenend.org.uk). 9 10 The GNU C Library is free software; you can redistribute it and/or 11 modify it under the terms of the GNU Library General Public License as 12 published by the Free Software Foundation; either version 2 of the 13 License, or (at your option) any later version. 14 15 The GNU C Library is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 Library General Public License for more details. 19 20 You should have received a copy of the GNU Library General Public 21 License along with the GNU C Library; see the file COPYING.LIB. If 22 not, write to the Free Software Foundation, Inc., 23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25 #ifndef _SFP_MACHINE_H 26 #define _SFP_MACHINE_H 27 28 #include <linux/config.h> 29 30 #define _FP_W_TYPE_SIZE 32 31 #define _FP_W_TYPE unsigned long 32 #define _FP_WS_TYPE signed long 33 #define _FP_I_TYPE long 34 35 #define _FP_MUL_MEAT_S(R,X,Y) \ 36 _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm) 37 #define _FP_MUL_MEAT_D(R,X,Y) \ 38 _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm) 39 #define _FP_MUL_MEAT_Q(R,X,Y) \ 40 _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm) 41 42 #define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y) 43 #define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y) 44 #define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y) 45 46 #define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1) 47 #define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1 48 #define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1 49 #define _FP_NANSIGN_S 0 50 #define _FP_NANSIGN_D 0 51 #define _FP_NANSIGN_Q 0 52 53 #define _FP_KEEPNANFRACP 1 54 55 /* 56 * If one NaN is signaling and the other is not, 57 * we choose that one, otherwise we choose X. 58 */ 59 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \ 60 do { \ 61 if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \ 62 && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) \ 63 { \ 64 R##_s = Y##_s; \ 65 _FP_FRAC_COPY_##wc(R,Y); \ 66 } \ 67 else \ 68 { \ 69 R##_s = X##_s; \ 70 _FP_FRAC_COPY_##wc(R,X); \ 71 } \ 72 R##_c = FP_CLS_NAN; \ 73 } while (0) 74 75 /* Some assembly to speed things up. */ 76 #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \ 77 unsigned int __r2 = (x2) + (y2); \ 78 unsigned int __r1 = (x1); \ 79 unsigned int __r0 = (x0); \ 80 __asm__ (" alr %2,%3\n" \ 81 " brc 12,0f\n" \ 82 " lhi 0,1\n" \ 83 " alr %1,0\n" \ 84 " brc 12,0f\n" \ 85 " alr %0,0\n" \ 86 "0:" \ 87 : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \ 88 : "d" (y0), "i" (1) : "cc", "0" ); \ 89 __asm__ (" alr %1,%2\n" \ 90 " brc 12,0f\n" \ 91 " ahi %0,1\n" \ 92 "0:" \ 93 : "+&d" (__r2), "+&d" (__r1) \ 94 : "d" (y1) : "cc" ); \ 95 (r2) = __r2; \ 96 (r1) = __r1; \ 97 (r0) = __r0; \ 98 }) 99 100 #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \ 101 unsigned int __r2 = (x2) - (y2); \ 102 unsigned int __r1 = (x1); \ 103 unsigned int __r0 = (x0); \ 104 __asm__ (" slr %2,%3\n" \ 105 " brc 3,0f\n" \ 106 " lhi 0,1\n" \ 107 " slr %1,0\n" \ 108 " brc 3,0f\n" \ 109 " slr %0,0\n" \ 110 "0:" \ 111 : "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \ 112 : "d" (y0) : "cc", "0" ); \ 113 __asm__ (" slr %1,%2\n" \ 114 " brc 3,0f\n" \ 115 " ahi %0,-1\n" \ 116 "0:" \ 117 : "+&d" (__r2), "+&d" (__r1) \ 118 : "d" (y1) : "cc" ); \ 119 (r2) = __r2; \ 120 (r1) = __r1; \ 121 (r0) = __r0; \ 122 }) 123 124 #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0) 125 126 /* Obtain the current rounding mode. */ 127 #define FP_ROUNDMODE mode 128 129 /* Exception flags. */ 130 #define FP_EX_INVALID 0x800000 131 #define FP_EX_DIVZERO 0x400000 132 #define FP_EX_OVERFLOW 0x200000 133 #define FP_EX_UNDERFLOW 0x100000 134 #define FP_EX_INEXACT 0x080000 135 136 /* We write the results always */ 137 #define FP_INHIBIT_RESULTS 0 138 139 #endif 140