2015-08-21 10:04:50 +03:00
|
|
|
/*
|
|
|
|
* x86 condition code helpers
|
|
|
|
*
|
|
|
|
* Copyright (c) 2008 Fabrice Bellard
|
|
|
|
*
|
|
|
|
* This library is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
* License as published by the Free Software Foundation; either
|
|
|
|
* version 2 of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This library is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
* Lesser General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define DATA_BITS (1 << (3 + SHIFT))
|
|
|
|
|
|
|
|
#if DATA_BITS == 8
|
|
|
|
#define SUFFIX b
|
|
|
|
#define DATA_TYPE uint8_t
|
|
|
|
#elif DATA_BITS == 16
|
|
|
|
#define SUFFIX w
|
|
|
|
#define DATA_TYPE uint16_t
|
|
|
|
#elif DATA_BITS == 32
|
|
|
|
#define SUFFIX l
|
|
|
|
#define DATA_TYPE uint32_t
|
|
|
|
#elif DATA_BITS == 64
|
|
|
|
#define SUFFIX q
|
|
|
|
#define DATA_TYPE uint64_t
|
|
|
|
#else
|
|
|
|
#error unhandled operand size
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#define SIGN_MASK (((DATA_TYPE)1) << (DATA_BITS - 1))
|
|
|
|
|
|
|
|
/* dynamic flags computation */
|
|
|
|
|
|
|
|
static int glue(compute_all_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src2 = dst - src1;
|
|
|
|
|
|
|
|
cf = dst < src1;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & CC_A;
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
return dst < src1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
|
|
|
|
DATA_TYPE src3)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src2 = dst - src1 - src3;
|
|
|
|
|
|
|
|
cf = (src3 ? dst <= src1 : dst < src1);
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & 0x10;
|
|
|
|
zf = (dst == 0) << 6;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & 0x80;
|
|
|
|
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
|
|
|
|
DATA_TYPE src3)
|
|
|
|
{
|
|
|
|
return src3 ? dst <= src1 : dst < src1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src1 = dst + src2;
|
|
|
|
|
|
|
|
cf = src1 < src2;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & CC_A;
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
|
|
|
|
{
|
|
|
|
DATA_TYPE src1 = dst + src2;
|
|
|
|
|
|
|
|
return src1 < src2;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
|
|
|
|
DATA_TYPE src3)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src1 = dst + src2 + src3;
|
|
|
|
|
|
|
|
cf = (src3 ? src1 <= src2 : src1 < src2);
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & 0x10;
|
|
|
|
zf = (dst == 0) << 6;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & 0x80;
|
|
|
|
of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
|
|
|
|
DATA_TYPE src3)
|
|
|
|
{
|
|
|
|
DATA_TYPE src1 = dst + src2 + src3;
|
|
|
|
|
|
|
|
return (src3 ? src1 <= src2 : src1 < src2);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_logic, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
|
|
|
|
cf = 0;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = 0;
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = 0;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_inc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src2;
|
|
|
|
|
2017-01-19 14:50:28 +03:00
|
|
|
cf = (int)src1;
|
2015-08-21 10:04:50 +03:00
|
|
|
src1 = dst - 1;
|
|
|
|
src2 = 1;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & CC_A;
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = (dst == SIGN_MASK) * CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_dec, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
DATA_TYPE src2;
|
|
|
|
|
2017-01-19 14:50:28 +03:00
|
|
|
cf = (int)src1;
|
2015-08-21 10:04:50 +03:00
|
|
|
src1 = dst + 1;
|
|
|
|
src2 = 1;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = (dst ^ src1 ^ src2) & CC_A;
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = (dst == SIGN_MASK - 1) * CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
|
|
|
|
cf = (src1 >> (DATA_BITS - 1)) & CC_C;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = 0; /* undefined */
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
/* of is defined iff shift count == 1 */
|
|
|
|
of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
return (src1 >> (DATA_BITS - 1)) & CC_C;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_sar, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
|
|
|
|
cf = src1 & 1;
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = 0; /* undefined */
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
/* of is defined iff shift count == 1 */
|
|
|
|
of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
|
|
|
|
CF are modified and it is slower to do that. Note as well that we
|
|
|
|
don't truncate SRC1 for computing carry to DATA_TYPE. */
|
|
|
|
static int glue(compute_all_mul, SUFFIX)(DATA_TYPE dst, target_long src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
|
|
|
|
cf = (src1 != 0);
|
|
|
|
pf = parity_table[(uint8_t)dst];
|
|
|
|
af = 0; /* undefined */
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = cf * CC_O;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_all_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
int cf, pf, af, zf, sf, of;
|
|
|
|
|
|
|
|
cf = (src1 == 0);
|
|
|
|
pf = 0; /* undefined */
|
|
|
|
af = 0; /* undefined */
|
|
|
|
zf = (dst == 0) * CC_Z;
|
|
|
|
sf = lshift(dst, 8 - DATA_BITS) & CC_S;
|
|
|
|
of = 0;
|
|
|
|
return cf | pf | af | zf | sf | of;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int glue(compute_c_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
|
|
|
|
{
|
|
|
|
return src1 == 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#undef DATA_BITS
|
|
|
|
#undef SIGN_MASK
|
|
|
|
#undef DATA_TYPE
|
|
|
|
#undef DATA_MASK
|
|
|
|
#undef SUFFIX
|