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/*
* Utility compute operations used by translated code.
*
* Copyright (c) 2007 Thiemo Seufer
* Copyright (c) 2007 Jocelyn Mayer
*
* 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.
*/
#ifndef HOST_UTILS_H
#define HOST_UTILS_H 1
#include "compiler.h" /* QEMU_GNUC_PREREQ */
#if defined(__x86_64__)
#define __HAVE_FAST_MULU64__
static inline void mulu64(uint64_t *plow, uint64_t *phigh,
uint64_t a, uint64_t b)
{
__asm__ ("mul %0\n\t"
: "=d" (*phigh), "=a" (*plow)
: "a" (a), "0" (b));
}
#define __HAVE_FAST_MULS64__
static inline void muls64(uint64_t *plow, uint64_t *phigh,
int64_t a, int64_t b)
{
__asm__ ("imul %0\n\t"
: "=d" (*phigh), "=a" (*plow)
: "a" (a), "0" (b));
}
#else
void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b);
void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b);
#endif
/* Binary search for leading zeros. */
static inline int clz32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
if (val)
return __builtin_clz(val);
else
return 32;
#else
int cnt = 0;
if (!(val & 0xFFFF0000U)) {
cnt += 16;
val <<= 16;
}
if (!(val & 0xFF000000U)) {
cnt += 8;
val <<= 8;
}
if (!(val & 0xF0000000U)) {
cnt += 4;
val <<= 4;
}
if (!(val & 0xC0000000U)) {
cnt += 2;
val <<= 2;
}
if (!(val & 0x80000000U)) {
cnt++;
val <<= 1;
}
if (!(val & 0x80000000U)) {
cnt++;
}
return cnt;
#endif
}
static inline int clo32(uint32_t val)
{
return clz32(~val);
}
static inline int clz64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
if (val)
return __builtin_clzll(val);
else
return 64;
#else
int cnt = 0;
if (!(val >> 32)) {
cnt += 32;
} else {
val >>= 32;
}
return cnt + clz32(val);
#endif
}
static inline int clo64(uint64_t val)
{
return clz64(~val);
}
static inline int ctz32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
if (val)
return __builtin_ctz(val);
else
return 32;
#else
int cnt;
cnt = 0;
if (!(val & 0x0000FFFFUL)) {
cnt += 16;
val >>= 16;
}
if (!(val & 0x000000FFUL)) {
cnt += 8;
val >>= 8;
}
if (!(val & 0x0000000FUL)) {
cnt += 4;
val >>= 4;
}
if (!(val & 0x00000003UL)) {
cnt += 2;
val >>= 2;
}
if (!(val & 0x00000001UL)) {
cnt++;
val >>= 1;
}
if (!(val & 0x00000001UL)) {
cnt++;
}
return cnt;
#endif
}
static inline int cto32(uint32_t val)
{
return ctz32(~val);
}
static inline int ctz64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
if (val)
return __builtin_ctzll(val);
else
return 64;
#else
int cnt;
cnt = 0;
if (!((uint32_t)val)) {
cnt += 32;
val >>= 32;
}
return cnt + ctz32(val);
#endif
}
static inline int cto64(uint64_t val)
{
return ctz64(~val);
}
static inline int ctpop8(uint8_t val)
{
val = (val & 0x55) + ((val >> 1) & 0x55);
val = (val & 0x33) + ((val >> 2) & 0x33);
val = (val & 0x0f) + ((val >> 4) & 0x0f);
return val;
}
static inline int ctpop16(uint16_t val)
{
val = (val & 0x5555) + ((val >> 1) & 0x5555);
val = (val & 0x3333) + ((val >> 2) & 0x3333);
val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
return val;
}
static inline int ctpop32(uint32_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
return __builtin_popcount(val);
#else
val = (val & 0x55555555) + ((val >> 1) & 0x55555555);
val = (val & 0x33333333) + ((val >> 2) & 0x33333333);
val = (val & 0x0f0f0f0f) + ((val >> 4) & 0x0f0f0f0f);
val = (val & 0x00ff00ff) + ((val >> 8) & 0x00ff00ff);
val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
return val;
#endif
}
static inline int ctpop64(uint64_t val)
{
#if QEMU_GNUC_PREREQ(3, 4)
return __builtin_popcountll(val);
#else
val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >> 4) & 0x0f0f0f0f0f0f0f0fULL);
val = (val & 0x00ff00ff00ff00ffULL) + ((val >> 8) & 0x00ff00ff00ff00ffULL);
val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
return val;
#endif
}
#endif
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