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git.proxmox.com Git - qemu.git/blob - host-utils.c
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2 * Utility compute operations used by translated code.
4 * Copyright (c) 2003 Fabrice Bellard
5 * Copyright (c) 2007 Aurelien Jarno
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 /* Long integer helpers */
29 static void add128 (uint64_t *plow
, uint64_t *phigh
, uint64_t a
, uint64_t b
)
38 static void neg128 (uint64_t *plow
, uint64_t *phigh
)
42 add128(plow
, phigh
, 1, 0);
45 static void mul64 (uint64_t *plow
, uint64_t *phigh
, uint64_t a
, uint64_t b
)
47 uint32_t a0
, a1
, b0
, b1
;
56 v
= (uint64_t)a0
* (uint64_t)b0
;
60 v
= (uint64_t)a0
* (uint64_t)b1
;
61 add128(plow
, phigh
, v
<< 32, v
>> 32);
63 v
= (uint64_t)a1
* (uint64_t)b0
;
64 add128(plow
, phigh
, v
<< 32, v
>> 32);
66 v
= (uint64_t)a1
* (uint64_t)b1
;
71 /* Unsigned 64x64 -> 128 multiplication */
72 void mulu64 (uint64_t *plow
, uint64_t *phigh
, uint64_t a
, uint64_t b
)
74 #if defined(__x86_64__)
76 : "=d" (*phigh
), "=a" (*plow
)
79 mul64(plow
, phigh
, a
, b
);
81 #if defined(DEBUG_MULDIV)
82 printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
87 /* Signed 64x64 -> 128 multiplication */
88 void muls64 (uint64_t *plow
, uint64_t *phigh
, int64_t a
, int64_t b
)
90 #if defined(__x86_64__)
91 __asm__ ("imul %0\n\t"
92 : "=d" (*phigh
), "=a" (*plow
)
103 mul64(plow
, phigh
, a
, b
);
108 #if defined(DEBUG_MULDIV)
109 printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
110 a
, b
, *phigh
, *plow
);