/* * Utility compute operations used by translated code. * * Copyright (c) 2003 Fabrice Bellard * Copyright (c) 2007 Aurelien Jarno * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <stdlib.h> #include <stdint.h> #include "host-utils.h" //#define DEBUG_MULDIV /* Long integer helpers */ #if !defined(__x86_64__) static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) { *plow += a; /* carry test */ if (*plow < a) (*phigh)++; *phigh += b; } static void neg128 (uint64_t *plow, uint64_t *phigh) { *plow = ~*plow; *phigh = ~*phigh; add128(plow, phigh, 1, 0); } static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) { uint32_t a0, a1, b0, b1; uint64_t v; a0 = a; a1 = a >> 32; b0 = b; b1 = b >> 32; v = (uint64_t)a0 * (uint64_t)b0; *plow = v; *phigh = 0; v = (uint64_t)a0 * (uint64_t)b1; add128(plow, phigh, v << 32, v >> 32); v = (uint64_t)a1 * (uint64_t)b0; add128(plow, phigh, v << 32, v >> 32); v = (uint64_t)a1 * (uint64_t)b1; *phigh += v; } /* Unsigned 64x64 -> 128 multiplication */ void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) { mul64(plow, phigh, a, b); #if defined(DEBUG_MULDIV) printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n", a, b, *phigh, *plow); #endif } /* Signed 64x64 -> 128 multiplication */ void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b) { int sa, sb; sa = (a < 0); if (sa) a = -a; sb = (b < 0); if (sb) b = -b; mul64(plow, phigh, a, b); if (sa ^ sb) { neg128(plow, phigh); } #if defined(DEBUG_MULDIV) printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n", a, b, *phigh, *plow); #endif } #endif /* !defined(__x86_64__) */