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Diffstat (limited to '')
-rw-r--r-- | arch/mips/math-emu/ieee754dp.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/mips/math-emu/ieee754dp.h b/arch/mips/math-emu/ieee754dp.h new file mode 100644 index 000000000..b7c43a99a --- /dev/null +++ b/arch/mips/math-emu/ieee754dp.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * IEEE754 floating point + * double precision internal header file + */ +/* + * MIPS floating point support + * Copyright (C) 1994-2000 Algorithmics Ltd. + */ + +#include <linux/compiler.h> + +#include "ieee754int.h" + +#define assert(expr) ((void)0) + +#define DP_EBIAS 1023 +#define DP_EMIN (-1022) +#define DP_EMAX 1023 +#define DP_FBITS 52 +#define DP_MBITS 52 + +#define DP_MBIT(x) ((u64)1 << (x)) +#define DP_HIDDEN_BIT DP_MBIT(DP_FBITS) +#define DP_SIGN_BIT DP_MBIT(63) + +#define DPSIGN(dp) (dp.sign) +#define DPBEXP(dp) (dp.bexp) +#define DPMANT(dp) (dp.mant) + +static inline int ieee754dp_finite(union ieee754dp x) +{ + return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; +} + +/* 3bit extended double precision sticky right shift */ +#define XDPSRS(v,rs) \ + ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0)) + +#define XDPSRSX1() \ + (xe++, (xm = (xm >> 1) | (xm & 1))) + +#define XDPSRS1(v) \ + (((v) >> 1) | ((v) & 1)) + +/* 32bit * 32bit => 64bit unsigned integer multiplication */ +#define DPXMULT(x, y) ((u64)(x) * (u64)y) + +/* convert denormal to normalized with extended exponent */ +#define DPDNORMx(m,e) \ + while ((m >> DP_FBITS) == 0) { m <<= 1; e--; } +#define DPDNORMX DPDNORMx(xm, xe) +#define DPDNORMY DPDNORMx(ym, ye) +#define DPDNORMZ DPDNORMx(zm, ze) + +static inline union ieee754dp builddp(int s, int bx, u64 m) +{ + union ieee754dp r; + + assert((s) == 0 || (s) == 1); + assert((bx) >= DP_EMIN - 1 + DP_EBIAS + && (bx) <= DP_EMAX + 1 + DP_EBIAS); + assert(((m) >> DP_FBITS) == 0); + + r.sign = s; + r.bexp = bx; + r.mant = m; + + return r; +} + +extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp); +extern union ieee754dp ieee754dp_format(int, int, u64); |