1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * IEEE754 floating point 4 * double precision internal header file 5 */ 6 /* 7 * MIPS floating point support 8 * Copyright (C) 1994-2000 Algorithmics Ltd. 9 */ 10 11 #include <linux/compiler.h> 12 13 #include "ieee754int.h" 14 15 #define assert(expr) ((void)0) 16 17 #define DP_EBIAS 1023 18 #define DP_EMIN (-1022) 19 #define DP_EMAX 1023 20 #define DP_FBITS 52 21 #define DP_MBITS 52 22 23 #define DP_MBIT(x) ((u64)1 << (x)) 24 #define DP_HIDDEN_BIT DP_MBIT(DP_FBITS) 25 #define DP_SIGN_BIT DP_MBIT(63) 26 27 #define DPSIGN(dp) (dp.sign) 28 #define DPBEXP(dp) (dp.bexp) 29 #define DPMANT(dp) (dp.mant) 30 31 static inline int ieee754dp_finite(union ieee754dp x) 32 { 33 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; 34 } 35 36 /* 3bit extended double precision sticky right shift */ 37 #define XDPSRS(v,rs) \ 38 ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0)) 39 40 #define XDPSRSX1() \ 41 (xe++, (xm = (xm >> 1) | (xm & 1))) 42 43 #define XDPSRS1(v) \ 44 (((v) >> 1) | ((v) & 1)) 45 46 /* 32bit * 32bit => 64bit unsigned integer multiplication */ 47 #define DPXMULT(x, y) ((u64)(x) * (u64)y) 48 49 /* convert denormal to normalized with extended exponent */ 50 #define DPDNORMx(m,e) \ 51 while ((m >> DP_FBITS) == 0) { m <<= 1; e--; } 52 #define DPDNORMX DPDNORMx(xm, xe) 53 #define DPDNORMY DPDNORMx(ym, ye) 54 #define DPDNORMZ DPDNORMx(zm, ze) 55 56 static inline union ieee754dp builddp(int s, int bx, u64 m) 57 { 58 union ieee754dp r; 59 60 assert((s) == 0 || (s) == 1); 61 assert((bx) >= DP_EMIN - 1 + DP_EBIAS 62 && (bx) <= DP_EMAX + 1 + DP_EBIAS); 63 assert(((m) >> DP_FBITS) == 0); 64 65 r.sign = s; 66 r.bexp = bx; 67 r.mant = m; 68 69 return r; 70 } 71 72 extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp); 73 extern union ieee754dp ieee754dp_format(int, int, u64); 74