278 lines
6.8 KiB
C
278 lines
6.8 KiB
C
/*
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* x86 condition code helpers
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*
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* Copyright (c) 2008 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define DATA_BITS (1 << (3 + SHIFT))
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#define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1))
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#if DATA_BITS == 8
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#define SUFFIX b
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#define DATA_TYPE uint8_t
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#define DATA_MASK 0xff
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#elif DATA_BITS == 16
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#define SUFFIX w
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#define DATA_TYPE uint16_t
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#define DATA_MASK 0xffff
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#elif DATA_BITS == 32
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#define SUFFIX l
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#define DATA_TYPE uint32_t
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#define DATA_MASK 0xffffffff
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#elif DATA_BITS == 64
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#define SUFFIX q
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#define DATA_TYPE uint64_t
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#define DATA_MASK 0xffffffffffffffffULL
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#else
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#error unhandled operand size
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#endif
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/* dynamic flags computation */
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static int glue(compute_all_add, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_SRC;
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src2 = CC_DST - CC_SRC;
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cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_add, SUFFIX)(void)
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{
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int cf;
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target_long src1;
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src1 = CC_SRC;
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cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
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return cf;
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}
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static int glue(compute_all_adc, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_SRC;
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src2 = CC_DST - CC_SRC - 1;
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cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_adc, SUFFIX)(void)
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{
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int cf;
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target_long src1;
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src1 = CC_SRC;
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cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
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return cf;
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}
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static int glue(compute_all_sub, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_sub, SUFFIX)(void)
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{
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int cf;
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
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return cf;
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}
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static int glue(compute_all_sbb, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_DST + CC_SRC + 1;
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src2 = CC_SRC;
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cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_sbb, SUFFIX)(void)
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{
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int cf;
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target_long src1, src2;
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src1 = CC_DST + CC_SRC + 1;
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src2 = CC_SRC;
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cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
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return cf;
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}
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static int glue(compute_all_logic, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = 0;
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pf = parity_table[(uint8_t)CC_DST];
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af = 0;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = 0;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_logic, SUFFIX)(void)
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{
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return 0;
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}
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static int glue(compute_all_inc, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_DST - 1;
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src2 = 1;
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cf = CC_SRC;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11;
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return cf | pf | af | zf | sf | of;
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}
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#if DATA_BITS == 32
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static int glue(compute_c_inc, SUFFIX)(void)
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{
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return CC_SRC;
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}
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#endif
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static int glue(compute_all_dec, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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target_long src1, src2;
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src1 = CC_DST + 1;
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src2 = 1;
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cf = CC_SRC;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_all_shl, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C;
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pf = parity_table[(uint8_t)CC_DST];
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af = 0; /* undefined */
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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/* of is defined if shift count == 1 */
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of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_shl, SUFFIX)(void)
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{
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return (CC_SRC >> (DATA_BITS - 1)) & CC_C;
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}
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#if DATA_BITS == 32
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static int glue(compute_c_sar, SUFFIX)(void)
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{
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return CC_SRC & 1;
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}
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#endif
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static int glue(compute_all_sar, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = CC_SRC & 1;
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pf = parity_table[(uint8_t)CC_DST];
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af = 0; /* undefined */
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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/* of is defined if shift count == 1 */
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of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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#if DATA_BITS == 32
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static int glue(compute_c_mul, SUFFIX)(void)
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{
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int cf;
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cf = (CC_SRC != 0);
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return cf;
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}
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#endif
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/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
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CF are modified and it is slower to do that. */
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static int glue(compute_all_mul, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = (CC_SRC != 0);
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pf = parity_table[(uint8_t)CC_DST];
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af = 0; /* undefined */
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zf = ((DATA_TYPE)CC_DST == 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = cf << 11;
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return cf | pf | af | zf | sf | of;
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}
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#undef DATA_BITS
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#undef SIGN_MASK
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#undef DATA_TYPE
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#undef DATA_MASK
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#undef SUFFIX
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