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 SP_EBIAS 127 18 #define SP_EMIN (-126) 19 #define SP_EMAX 127 20 #define SP_FBITS 23 21 #define SP_MBITS 23 22 23 #define SP_MBIT(x) ((u32)1 << (x)) 24 #define SP_HIDDEN_BIT SP_MBIT(SP_FBITS) 25 #define SP_SIGN_BIT SP_MBIT(31) 26 27 #define SPSIGN(sp) (sp.sign) 28 #define SPBEXP(sp) (sp.bexp) 29 #define SPMANT(sp) (sp.mant) 30 31 static inline int ieee754sp_finite(union ieee754sp x) 32 { 33 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; 34 } 35 36 /* 64 bit right shift with rounding */ 37 #define XSPSRS64(v, rs) \ 38 (((rs) >= 64) ? ((v) != 0) : ((v) >> (rs)) | ((v) << (64-(rs)) != 0)) 39 40 /* 3bit extended single precision sticky right shift */ 41 #define XSPSRS(v, rs) \ 42 ((rs > (SP_FBITS+3))?1:((v) >> (rs)) | ((v) << (32-(rs)) != 0)) 43 44 #define XSPSRS1(m) \ 45 ((m >> 1) | (m & 1)) 46 47 #define SPXSRSX1() \ 48 (xe++, (xm = XSPSRS1(xm))) 49 50 #define SPXSRSY1() \ 51 (ye++, (ym = XSPSRS1(ym))) 52 53 /* convert denormal to normalized with extended exponent */ 54 #define SPDNORMx(m,e) \ 55 while ((m >> SP_FBITS) == 0) { m <<= 1; e--; } 56 #define SPDNORMX SPDNORMx(xm, xe) 57 #define SPDNORMY SPDNORMx(ym, ye) 58 #define SPDNORMZ SPDNORMx(zm, ze) 59 60 static inline union ieee754sp buildsp(int s, int bx, unsigned int m) 61 { 62 union ieee754sp r; 63 64 assert((s) == 0 || (s) == 1); 65 assert((bx) >= SP_EMIN - 1 + SP_EBIAS 66 && (bx) <= SP_EMAX + 1 + SP_EBIAS); 67 assert(((m) >> SP_FBITS) == 0); 68 69 r.sign = s; 70 r.bexp = bx; 71 r.mant = m; 72 73 return r; 74 } 75 76 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp); 77 extern union ieee754sp ieee754sp_format(int, int, unsigned); 78