cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ieee754.c (2959B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* ieee754 floating point arithmetic
      3 * single and double precision
      4 *
      5 * BUGS
      6 * not much dp done
      7 * doesn't generate IEEE754_INEXACT
      8 */
      9/*
     10 * MIPS floating point support
     11 * Copyright (C) 1994-2000 Algorithmics Ltd.
     12 */
     13
     14#include <linux/compiler.h>
     15
     16#include "ieee754.h"
     17#include "ieee754sp.h"
     18#include "ieee754dp.h"
     19
     20/*
     21 * Special constants
     22 */
     23
     24/*
     25 * Older GCC requires the inner braces for initialization of union ieee754dp's
     26 * anonymous struct member.  Without an error will result.
     27 */
     28#define xPCNST(s, b, m, ebias)						\
     29{									\
     30	{								\
     31		.sign	= (s),						\
     32		.bexp	= (b) + ebias,					\
     33		.mant	= (m)						\
     34	}								\
     35}
     36
     37#define DPCNST(s, b, m)							\
     38	xPCNST(s, b, m, DP_EBIAS)
     39
     40const union ieee754dp __ieee754dp_spcvals[] = {
     41	DPCNST(0, DP_EMIN - 1, 0x0000000000000ULL),	/* + zero   */
     42	DPCNST(1, DP_EMIN - 1, 0x0000000000000ULL),	/* - zero   */
     43	DPCNST(0, 0,	       0x0000000000000ULL),	/* + 1.0   */
     44	DPCNST(1, 0,	       0x0000000000000ULL),	/* - 1.0   */
     45	DPCNST(0, 3,           0x4000000000000ULL),	/* + 10.0   */
     46	DPCNST(1, 3,           0x4000000000000ULL),	/* - 10.0   */
     47	DPCNST(0, DP_EMAX + 1, 0x0000000000000ULL),	/* + infinity */
     48	DPCNST(1, DP_EMAX + 1, 0x0000000000000ULL),	/* - infinity */
     49	DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL),	/* + ind legacy qNaN */
     50	DPCNST(0, DP_EMAX + 1, 0x8000000000000ULL),	/* + indef 2008 qNaN */
     51	DPCNST(0, DP_EMAX,     0xFFFFFFFFFFFFFULL),	/* + max */
     52	DPCNST(1, DP_EMAX,     0xFFFFFFFFFFFFFULL),	/* - max */
     53	DPCNST(0, DP_EMIN,     0x0000000000000ULL),	/* + min normal */
     54	DPCNST(1, DP_EMIN,     0x0000000000000ULL),	/* - min normal */
     55	DPCNST(0, DP_EMIN - 1, 0x0000000000001ULL),	/* + min denormal */
     56	DPCNST(1, DP_EMIN - 1, 0x0000000000001ULL),	/* - min denormal */
     57	DPCNST(0, 31,          0x0000000000000ULL),	/* + 1.0e31 */
     58	DPCNST(0, 63,          0x0000000000000ULL),	/* + 1.0e63 */
     59};
     60
     61#define SPCNST(s, b, m)							\
     62	xPCNST(s, b, m, SP_EBIAS)
     63
     64const union ieee754sp __ieee754sp_spcvals[] = {
     65	SPCNST(0, SP_EMIN - 1, 0x000000),	/* + zero   */
     66	SPCNST(1, SP_EMIN - 1, 0x000000),	/* - zero   */
     67	SPCNST(0, 0,	       0x000000),	/* + 1.0   */
     68	SPCNST(1, 0,	       0x000000),	/* - 1.0   */
     69	SPCNST(0, 3,	       0x200000),	/* + 10.0   */
     70	SPCNST(1, 3,	       0x200000),	/* - 10.0   */
     71	SPCNST(0, SP_EMAX + 1, 0x000000),	/* + infinity */
     72	SPCNST(1, SP_EMAX + 1, 0x000000),	/* - infinity */
     73	SPCNST(0, SP_EMAX + 1, 0x3FFFFF),	/* + indef legacy quiet NaN */
     74	SPCNST(0, SP_EMAX + 1, 0x400000),	/* + indef 2008 quiet NaN */
     75	SPCNST(0, SP_EMAX,     0x7FFFFF),	/* + max normal */
     76	SPCNST(1, SP_EMAX,     0x7FFFFF),	/* - max normal */
     77	SPCNST(0, SP_EMIN,     0x000000),	/* + min normal */
     78	SPCNST(1, SP_EMIN,     0x000000),	/* - min normal */
     79	SPCNST(0, SP_EMIN - 1, 0x000001),	/* + min denormal */
     80	SPCNST(1, SP_EMIN - 1, 0x000001),	/* - min denormal */
     81	SPCNST(0, 31,	       0x000000),	/* + 1.0e31 */
     82	SPCNST(0, 63,	       0x000000),	/* + 1.0e63 */
     83};