mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-28 05:50:37 +00:00
175de52487
Cleaned up with scripts/clean-header-guards.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
520 lines
12 KiB
C
520 lines
12 KiB
C
/*
|
|
* 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
|
|
|
|
#include "qemu/bswap.h"
|
|
|
|
#ifdef CONFIG_INT128
|
|
static inline void mulu64(uint64_t *plow, uint64_t *phigh,
|
|
uint64_t a, uint64_t b)
|
|
{
|
|
__uint128_t r = (__uint128_t)a * b;
|
|
*plow = r;
|
|
*phigh = r >> 64;
|
|
}
|
|
|
|
static inline void muls64(uint64_t *plow, uint64_t *phigh,
|
|
int64_t a, int64_t b)
|
|
{
|
|
__int128_t r = (__int128_t)a * b;
|
|
*plow = r;
|
|
*phigh = r >> 64;
|
|
}
|
|
|
|
/* compute with 96 bit intermediate result: (a*b)/c */
|
|
static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
|
|
{
|
|
return (__int128_t)a * b / c;
|
|
}
|
|
|
|
static inline int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor)
|
|
{
|
|
if (divisor == 0) {
|
|
return 1;
|
|
} else {
|
|
__uint128_t dividend = ((__uint128_t)*phigh << 64) | *plow;
|
|
__uint128_t result = dividend / divisor;
|
|
*plow = result;
|
|
*phigh = dividend % divisor;
|
|
return result > UINT64_MAX;
|
|
}
|
|
}
|
|
|
|
static inline int divs128(int64_t *plow, int64_t *phigh, int64_t divisor)
|
|
{
|
|
if (divisor == 0) {
|
|
return 1;
|
|
} else {
|
|
__int128_t dividend = ((__int128_t)*phigh << 64) | *plow;
|
|
__int128_t result = dividend / divisor;
|
|
*plow = result;
|
|
*phigh = dividend % divisor;
|
|
return result != *plow;
|
|
}
|
|
}
|
|
#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);
|
|
int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor);
|
|
int divs128(int64_t *plow, int64_t *phigh, int64_t divisor);
|
|
|
|
static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
|
|
{
|
|
union {
|
|
uint64_t ll;
|
|
struct {
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
uint32_t high, low;
|
|
#else
|
|
uint32_t low, high;
|
|
#endif
|
|
} l;
|
|
} u, res;
|
|
uint64_t rl, rh;
|
|
|
|
u.ll = a;
|
|
rl = (uint64_t)u.l.low * (uint64_t)b;
|
|
rh = (uint64_t)u.l.high * (uint64_t)b;
|
|
rh += (rl >> 32);
|
|
res.l.high = rh / c;
|
|
res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
|
|
return res.ll;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* clz32 - count leading zeros in a 32-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 32 if the value is zero. Note that the GCC builtin is
|
|
* undefined if the value is zero.
|
|
*/
|
|
static inline int clz32(uint32_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return val ? __builtin_clz(val) : 32;
|
|
#else
|
|
/* Binary search for the leading one bit. */
|
|
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
|
|
}
|
|
|
|
/**
|
|
* clo32 - count leading ones in a 32-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 32 if the value is -1.
|
|
*/
|
|
static inline int clo32(uint32_t val)
|
|
{
|
|
return clz32(~val);
|
|
}
|
|
|
|
/**
|
|
* clz64 - count leading zeros in a 64-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 64 if the value is zero. Note that the GCC builtin is
|
|
* undefined if the value is zero.
|
|
*/
|
|
static inline int clz64(uint64_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return val ? __builtin_clzll(val) : 64;
|
|
#else
|
|
int cnt = 0;
|
|
|
|
if (!(val >> 32)) {
|
|
cnt += 32;
|
|
} else {
|
|
val >>= 32;
|
|
}
|
|
|
|
return cnt + clz32(val);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* clo64 - count leading ones in a 64-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 64 if the value is -1.
|
|
*/
|
|
static inline int clo64(uint64_t val)
|
|
{
|
|
return clz64(~val);
|
|
}
|
|
|
|
/**
|
|
* ctz32 - count trailing zeros in a 32-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 32 if the value is zero. Note that the GCC builtin is
|
|
* undefined if the value is zero.
|
|
*/
|
|
static inline int ctz32(uint32_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return val ? __builtin_ctz(val) : 32;
|
|
#else
|
|
/* Binary search for the trailing one bit. */
|
|
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
|
|
}
|
|
|
|
/**
|
|
* cto32 - count trailing ones in a 32-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 32 if the value is -1.
|
|
*/
|
|
static inline int cto32(uint32_t val)
|
|
{
|
|
return ctz32(~val);
|
|
}
|
|
|
|
/**
|
|
* ctz64 - count trailing zeros in a 64-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 64 if the value is zero. Note that the GCC builtin is
|
|
* undefined if the value is zero.
|
|
*/
|
|
static inline int ctz64(uint64_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return val ? __builtin_ctzll(val) : 64;
|
|
#else
|
|
int cnt;
|
|
|
|
cnt = 0;
|
|
if (!((uint32_t)val)) {
|
|
cnt += 32;
|
|
val >>= 32;
|
|
}
|
|
|
|
return cnt + ctz32(val);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* cto64 - count trailing ones in a 64-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns 64 if the value is -1.
|
|
*/
|
|
static inline int cto64(uint64_t val)
|
|
{
|
|
return ctz64(~val);
|
|
}
|
|
|
|
/**
|
|
* clrsb32 - count leading redundant sign bits in a 32-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns the number of bits following the sign bit that are equal to it.
|
|
* No special cases; output range is [0-31].
|
|
*/
|
|
static inline int clrsb32(uint32_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(4, 7)
|
|
return __builtin_clrsb(val);
|
|
#else
|
|
return clz32(val ^ ((int32_t)val >> 1)) - 1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* clrsb64 - count leading redundant sign bits in a 64-bit value.
|
|
* @val: The value to search
|
|
*
|
|
* Returns the number of bits following the sign bit that are equal to it.
|
|
* No special cases; output range is [0-63].
|
|
*/
|
|
static inline int clrsb64(uint64_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(4, 7)
|
|
return __builtin_clrsbll(val);
|
|
#else
|
|
return clz64(val ^ ((int64_t)val >> 1)) - 1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* ctpop8 - count the population of one bits in an 8-bit value.
|
|
* @val: The value to search
|
|
*/
|
|
static inline int ctpop8(uint8_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return __builtin_popcount(val);
|
|
#else
|
|
val = (val & 0x55) + ((val >> 1) & 0x55);
|
|
val = (val & 0x33) + ((val >> 2) & 0x33);
|
|
val = (val & 0x0f) + ((val >> 4) & 0x0f);
|
|
|
|
return val;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* ctpop16 - count the population of one bits in a 16-bit value.
|
|
* @val: The value to search
|
|
*/
|
|
static inline int ctpop16(uint16_t val)
|
|
{
|
|
#if QEMU_GNUC_PREREQ(3, 4)
|
|
return __builtin_popcount(val);
|
|
#else
|
|
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;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* ctpop32 - count the population of one bits in a 32-bit value.
|
|
* @val: The value to search
|
|
*/
|
|
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
|
|
}
|
|
|
|
/**
|
|
* ctpop64 - count the population of one bits in a 64-bit value.
|
|
* @val: The value to search
|
|
*/
|
|
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
|
|
}
|
|
|
|
/**
|
|
* revbit8 - reverse the bits in an 8-bit value.
|
|
* @x: The value to modify.
|
|
*/
|
|
static inline uint8_t revbit8(uint8_t x)
|
|
{
|
|
/* Assign the correct nibble position. */
|
|
x = ((x & 0xf0) >> 4)
|
|
| ((x & 0x0f) << 4);
|
|
/* Assign the correct bit position. */
|
|
x = ((x & 0x88) >> 3)
|
|
| ((x & 0x44) >> 1)
|
|
| ((x & 0x22) << 1)
|
|
| ((x & 0x11) << 3);
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* revbit16 - reverse the bits in a 16-bit value.
|
|
* @x: The value to modify.
|
|
*/
|
|
static inline uint16_t revbit16(uint16_t x)
|
|
{
|
|
/* Assign the correct byte position. */
|
|
x = bswap16(x);
|
|
/* Assign the correct nibble position. */
|
|
x = ((x & 0xf0f0) >> 4)
|
|
| ((x & 0x0f0f) << 4);
|
|
/* Assign the correct bit position. */
|
|
x = ((x & 0x8888) >> 3)
|
|
| ((x & 0x4444) >> 1)
|
|
| ((x & 0x2222) << 1)
|
|
| ((x & 0x1111) << 3);
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* revbit32 - reverse the bits in a 32-bit value.
|
|
* @x: The value to modify.
|
|
*/
|
|
static inline uint32_t revbit32(uint32_t x)
|
|
{
|
|
/* Assign the correct byte position. */
|
|
x = bswap32(x);
|
|
/* Assign the correct nibble position. */
|
|
x = ((x & 0xf0f0f0f0u) >> 4)
|
|
| ((x & 0x0f0f0f0fu) << 4);
|
|
/* Assign the correct bit position. */
|
|
x = ((x & 0x88888888u) >> 3)
|
|
| ((x & 0x44444444u) >> 1)
|
|
| ((x & 0x22222222u) << 1)
|
|
| ((x & 0x11111111u) << 3);
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* revbit64 - reverse the bits in a 64-bit value.
|
|
* @x: The value to modify.
|
|
*/
|
|
static inline uint64_t revbit64(uint64_t x)
|
|
{
|
|
/* Assign the correct byte position. */
|
|
x = bswap64(x);
|
|
/* Assign the correct nibble position. */
|
|
x = ((x & 0xf0f0f0f0f0f0f0f0ull) >> 4)
|
|
| ((x & 0x0f0f0f0f0f0f0f0full) << 4);
|
|
/* Assign the correct bit position. */
|
|
x = ((x & 0x8888888888888888ull) >> 3)
|
|
| ((x & 0x4444444444444444ull) >> 1)
|
|
| ((x & 0x2222222222222222ull) << 1)
|
|
| ((x & 0x1111111111111111ull) << 3);
|
|
return x;
|
|
}
|
|
|
|
/* Host type specific sizes of these routines. */
|
|
|
|
#if ULONG_MAX == UINT32_MAX
|
|
# define clzl clz32
|
|
# define ctzl ctz32
|
|
# define clol clo32
|
|
# define ctol cto32
|
|
# define ctpopl ctpop32
|
|
# define revbitl revbit32
|
|
#elif ULONG_MAX == UINT64_MAX
|
|
# define clzl clz64
|
|
# define ctzl ctz64
|
|
# define clol clo64
|
|
# define ctol cto64
|
|
# define ctpopl ctpop64
|
|
# define revbitl revbit64
|
|
#else
|
|
# error Unknown sizeof long
|
|
#endif
|
|
|
|
static inline bool is_power_of_2(uint64_t value)
|
|
{
|
|
if (!value) {
|
|
return false;
|
|
}
|
|
|
|
return !(value & (value - 1));
|
|
}
|
|
|
|
/* round down to the nearest power of 2*/
|
|
static inline int64_t pow2floor(int64_t value)
|
|
{
|
|
if (!is_power_of_2(value)) {
|
|
value = 0x8000000000000000ULL >> clz64(value);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
/* round up to the nearest power of 2 (0 if overflow) */
|
|
static inline uint64_t pow2ceil(uint64_t value)
|
|
{
|
|
uint8_t nlz = clz64(value);
|
|
|
|
if (is_power_of_2(value)) {
|
|
return value;
|
|
}
|
|
if (!nlz) {
|
|
return 0;
|
|
}
|
|
return 1ULL << (64 - nlz);
|
|
}
|
|
|
|
#endif
|