404 lines
13 KiB
C
404 lines
13 KiB
C
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2017 The Bochs Project
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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, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#ifndef BX_LAZY_FLAGS_DEF
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#define BX_LAZY_FLAGS_DEF
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#if BX_SUPPORT_X86_64
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#define BX_LF_SIGN_BIT 63
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#else
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#define BX_LF_SIGN_BIT 31
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#endif
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// These are the lazy flags bits in oszapc.auxbits which hold lazy state
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// of zero flag, adjust flag, carry flag, and overflow flag.
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enum {
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LF_BIT_SD = 0, /* lazy Sign Flag Delta */
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LF_BIT_AF = 3, /* lazy Adjust flag */
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LF_BIT_PDB = 8, /* lazy Parity Delta Byte (8 bits) */
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LF_BIT_CF = 31, /* lazy Carry Flag */
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LF_BIT_PO = 30 /* lazy Partial Overflow = CF ^ OF */
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};
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const Bit32u LF_MASK_SD = (0x01 << LF_BIT_SD);
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const Bit32u LF_MASK_AF = (0x01 << LF_BIT_AF);
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const Bit32u LF_MASK_PDB = (0xFF << LF_BIT_PDB);
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const Bit32u LF_MASK_CF = (0x01 << LF_BIT_CF);
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const Bit32u LF_MASK_PO = (0x01 << LF_BIT_PO);
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#define ADD_COUT_VEC(op1, op2, result) \
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(((op1) & (op2)) | (((op1) | (op2)) & (~(result))))
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#define SUB_COUT_VEC(op1, op2, result) \
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(((~(op1)) & (op2)) | (((~(op1)) ^ (op2)) & (result)))
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#define GET_ADD_OVERFLOW(op1, op2, result, mask) \
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((((op1) ^ (result)) & ((op2) ^ (result))) & (mask))
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// *******************
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// OSZAPC
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// *******************
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/* size, carries, result */
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#define SET_FLAGS_OSZAPC_SIZE(size, lf_carries, lf_result) { \
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bx_address temp = ((lf_carries) & (LF_MASK_AF)) | \
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(((lf_carries) >> (size - 2)) << LF_BIT_PO); \
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BX_CPU_THIS_PTR oszapc.result = (bx_address)(Bit##size##s)(lf_result); \
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if ((size) == 32) temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
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if ((size) == 16) temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
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if ((size) == 8) temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
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BX_CPU_THIS_PTR oszapc.auxbits = (bx_address)(Bit32u)temp; \
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}
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/* carries, result */
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#define SET_FLAGS_OSZAPC_8(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(8, carries, result)
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#define SET_FLAGS_OSZAPC_16(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(16, carries, result)
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#define SET_FLAGS_OSZAPC_32(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(32, carries, result)
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAPC_64(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(64, carries, result)
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#endif
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/* result */
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#define SET_FLAGS_OSZAPC_LOGIC_8(result_8) \
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SET_FLAGS_OSZAPC_8(0, (result_8))
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#define SET_FLAGS_OSZAPC_LOGIC_16(result_16) \
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SET_FLAGS_OSZAPC_16(0, (result_16))
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#define SET_FLAGS_OSZAPC_LOGIC_32(result_32) \
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SET_FLAGS_OSZAPC_32(0, (result_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAPC_LOGIC_64(result_64) \
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SET_FLAGS_OSZAPC_64(BX_CONST64(0), (result_64))
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#endif
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/* op1, op2, result */
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#define SET_FLAGS_OSZAPC_ADD_8(op1_8, op2_8, sum_8) \
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SET_FLAGS_OSZAPC_8(ADD_COUT_VEC((op1_8), (op2_8), (sum_8)), (sum_8))
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#define SET_FLAGS_OSZAPC_ADD_16(op1_16, op2_16, sum_16) \
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SET_FLAGS_OSZAPC_16(ADD_COUT_VEC((op1_16), (op2_16), (sum_16)), (sum_16))
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#define SET_FLAGS_OSZAPC_ADD_32(op1_32, op2_32, sum_32) \
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SET_FLAGS_OSZAPC_32(ADD_COUT_VEC((op1_32), (op2_32), (sum_32)), (sum_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAPC_ADD_64(op1_64, op2_64, sum_64) \
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SET_FLAGS_OSZAPC_64(ADD_COUT_VEC((op1_64), (op2_64), (sum_64)), (sum_64))
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#endif
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/* op1, op2, result */
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#define SET_FLAGS_OSZAPC_SUB_8(op1_8, op2_8, diff_8) \
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SET_FLAGS_OSZAPC_8(SUB_COUT_VEC((op1_8), (op2_8), (diff_8)), (diff_8))
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#define SET_FLAGS_OSZAPC_SUB_16(op1_16, op2_16, diff_16) \
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SET_FLAGS_OSZAPC_16(SUB_COUT_VEC((op1_16), (op2_16), (diff_16)), (diff_16))
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#define SET_FLAGS_OSZAPC_SUB_32(op1_32, op2_32, diff_32) \
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SET_FLAGS_OSZAPC_32(SUB_COUT_VEC((op1_32), (op2_32), (diff_32)), (diff_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAPC_SUB_64(op1_64, op2_64, diff_64) \
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SET_FLAGS_OSZAPC_64(SUB_COUT_VEC((op1_64), (op2_64), (diff_64)), (diff_64))
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#endif
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// *******************
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// OSZAP
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// *******************
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/* size, carries, result */
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#define SET_FLAGS_OSZAP_SIZE(size, lf_carries, lf_result) { \
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bx_address temp = ((lf_carries) & (LF_MASK_AF)) | \
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(((lf_carries) >> (size - 2)) << LF_BIT_PO); \
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if ((size) == 32) temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
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if ((size) == 16) temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
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if ((size) == 8) temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
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BX_CPU_THIS_PTR oszapc.result = (bx_address)(Bit##size##s)(lf_result); \
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bx_address delta_c = (BX_CPU_THIS_PTR oszapc.auxbits ^ temp) & LF_MASK_CF; \
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delta_c ^= (delta_c >> 1); \
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BX_CPU_THIS_PTR oszapc.auxbits = (bx_address)(Bit32u)(temp ^ delta_c); \
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}
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/* carries, result */
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#define SET_FLAGS_OSZAP_8(carries, result) \
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SET_FLAGS_OSZAP_SIZE(8, carries, result)
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#define SET_FLAGS_OSZAP_16(carries, result) \
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SET_FLAGS_OSZAP_SIZE(16, carries, result)
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#define SET_FLAGS_OSZAP_32(carries, result) \
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SET_FLAGS_OSZAP_SIZE(32, carries, result)
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAP_64(carries, result) \
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SET_FLAGS_OSZAP_SIZE(64, carries, result)
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#endif
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/* op1, op2, result */
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#define SET_FLAGS_OSZAP_ADD_8(op1_8, op2_8, sum_8) \
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SET_FLAGS_OSZAP_8(ADD_COUT_VEC((op1_8), (op2_8), (sum_8)), (sum_8))
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#define SET_FLAGS_OSZAP_ADD_16(op1_16, op2_16, sum_16) \
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SET_FLAGS_OSZAP_16(ADD_COUT_VEC((op1_16), (op2_16), (sum_16)), (sum_16))
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#define SET_FLAGS_OSZAP_ADD_32(op1_32, op2_32, sum_32) \
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SET_FLAGS_OSZAP_32(ADD_COUT_VEC((op1_32), (op2_32), (sum_32)), (sum_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAP_ADD_64(op1_64, op2_64, sum_64) \
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SET_FLAGS_OSZAP_64(ADD_COUT_VEC((op1_64), (op2_64), (sum_64)), (sum_64))
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#endif
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/* op1, op2, result */
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#define SET_FLAGS_OSZAP_SUB_8(op1_8, op2_8, diff_8) \
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SET_FLAGS_OSZAP_8(SUB_COUT_VEC((op1_8), (op2_8), (diff_8)), (diff_8))
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#define SET_FLAGS_OSZAP_SUB_16(op1_16, op2_16, diff_16) \
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SET_FLAGS_OSZAP_16(SUB_COUT_VEC((op1_16), (op2_16), (diff_16)), (diff_16))
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#define SET_FLAGS_OSZAP_SUB_32(op1_32, op2_32, diff_32) \
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SET_FLAGS_OSZAP_32(SUB_COUT_VEC((op1_32), (op2_32), (diff_32)), (diff_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAP_SUB_64(op1_64, op2_64, diff_64) \
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SET_FLAGS_OSZAP_64(SUB_COUT_VEC((op1_64), (op2_64), (diff_64)), (diff_64))
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#endif
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// *******************
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// OSZAxC
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// *******************
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/* size, carries, result */
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#define SET_FLAGS_OSZAxC_LOGIC_SIZE(size, lf_result) { \
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bx_bool saved_PF = getB_PF(); \
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SET_FLAGS_OSZAPC_SIZE(size, (Bit##size##u)(0), lf_result); \
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set_PF(saved_PF); \
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}
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/* result */
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#define SET_FLAGS_OSZAxC_LOGIC_32(result_32) \
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SET_FLAGS_OSZAxC_LOGIC_SIZE(32, (result_32))
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#if BX_SUPPORT_X86_64
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#define SET_FLAGS_OSZAxC_LOGIC_64(result_64) \
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SET_FLAGS_OSZAxC_LOGIC_SIZE(64, (result_64))
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#endif
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struct bx_lazyflags_entry {
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bx_address result;
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bx_address auxbits;
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BX_CPP_INLINE unsigned getB_OF(void) const;
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BX_CPP_INLINE unsigned get_OF(void) const;
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BX_CPP_INLINE void set_OF(bx_bool val);
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BX_CPP_INLINE void clear_OF(void);
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BX_CPP_INLINE void assert_OF(void);
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BX_CPP_INLINE unsigned getB_SF(void) const;
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BX_CPP_INLINE unsigned get_SF(void) const;
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BX_CPP_INLINE void set_SF(bx_bool val);
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BX_CPP_INLINE void clear_SF(void);
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BX_CPP_INLINE void assert_SF(void);
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BX_CPP_INLINE unsigned getB_ZF(void) const;
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BX_CPP_INLINE unsigned get_ZF(void) const;
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BX_CPP_INLINE void set_ZF(bx_bool val);
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BX_CPP_INLINE void clear_ZF(void);
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BX_CPP_INLINE void assert_ZF(void);
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BX_CPP_INLINE unsigned getB_AF(void) const;
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BX_CPP_INLINE unsigned get_AF(void) const;
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BX_CPP_INLINE void set_AF(bx_bool val);
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BX_CPP_INLINE void clear_AF(void);
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BX_CPP_INLINE void assert_AF(void);
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BX_CPP_INLINE unsigned getB_PF(void) const;
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BX_CPP_INLINE unsigned get_PF(void) const;
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BX_CPP_INLINE void set_PF(bx_bool val);
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BX_CPP_INLINE void clear_PF(void);
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BX_CPP_INLINE void assert_PF(void);
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BX_CPP_INLINE unsigned getB_CF(void) const;
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BX_CPP_INLINE unsigned get_CF(void) const;
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BX_CPP_INLINE void set_CF(bx_bool val);
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BX_CPP_INLINE void clear_CF(void);
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BX_CPP_INLINE void assert_CF(void);
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BX_CPP_INLINE void set_flags_OxxxxC(Bit32u new_of, Bit32u new_cf)
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{
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Bit32u temp_po = new_of ^ new_cf;
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auxbits &= ~(LF_MASK_PO | LF_MASK_CF);
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auxbits |= (temp_po << LF_BIT_PO) | (new_cf << LF_BIT_CF);
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}
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BX_CPP_INLINE void assert_flags_OxxxxC() { set_flags_OxxxxC(1,1); }
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};
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/// OF ////////////////////////////////////////
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_OF(void) const
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{
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return ((auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_OF(void) const
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{
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return (auxbits + (1U << LF_BIT_PO)) & (1U << LF_BIT_CF);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::set_OF(bx_bool val)
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{
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bx_bool temp_cf = getB_CF();
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set_flags_OxxxxC(val, temp_cf);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_OF(void)
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{
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bx_bool temp_cf = getB_CF();
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set_flags_OxxxxC(0, temp_cf);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::assert_OF(void)
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{
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unsigned temp_cf = getB_CF();
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set_flags_OxxxxC(1, temp_cf);
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}
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/// SF ////////////////////////////////////////
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_SF(void) const
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{
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return ((result >> BX_LF_SIGN_BIT) ^ (auxbits >> LF_BIT_SD)) & 1;
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_SF(void) const { return getB_SF(); }
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BX_CPP_INLINE void bx_lazyflags_entry::set_SF(bx_bool val)
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{
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bx_bool temp_sf = getB_SF();
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auxbits ^= (temp_sf ^ val) << LF_BIT_SD;
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_SF (void) { set_SF(0); }
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BX_CPP_INLINE void bx_lazyflags_entry::assert_SF (void) { set_SF(1); }
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/// ZF ////////////////////////////////////////
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_ZF(void) const
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{
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return (0 == result);
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_ZF(void) const { return getB_ZF(); }
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BX_CPP_INLINE void bx_lazyflags_entry::set_ZF(bx_bool val)
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{
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if (val) assert_ZF();
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else clear_ZF();
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_ZF(void)
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{
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result |= (1 << 8);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::assert_ZF(void)
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{
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// merge the sign bit into the Sign Delta
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auxbits ^= (((result >> BX_LF_SIGN_BIT) & 1) << LF_BIT_SD);
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// merge the parity bits into the Parity Delta Byte
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Bit32u temp_pdb = (255 & result);
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auxbits ^= (temp_pdb << LF_BIT_PDB);
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// now zero the .result value
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result = 0;
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}
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/// AF ////////////////////////////////////////
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// AF - bit 4 in EFLAGS, represented by bit LF_BIT_AF of oszapc.auxbits
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_AF(void) const
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{
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return (auxbits >> LF_BIT_AF) & 1;
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_AF(void) const
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{
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return (auxbits & LF_MASK_AF);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::set_AF(bx_bool val)
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{
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auxbits &= ~(LF_MASK_AF);
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auxbits |= (val) << LF_BIT_AF;
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_AF(void)
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{
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auxbits &= ~(LF_MASK_AF);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::assert_AF(void)
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{
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auxbits |= (LF_MASK_AF);
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}
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/// PF ////////////////////////////////////////
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// PF - bit 2 in EFLAGS, represented by lower 8 bits of oszapc.result
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_PF(void) const
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{
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Bit32u temp = (255 & result);
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temp = temp ^ (255 & (auxbits >> LF_BIT_PDB));
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temp = (temp ^ (temp >> 4)) & 0x0F;
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return (0x9669U >> temp) & 1;
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_PF(void) const { return getB_PF(); }
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BX_CPP_INLINE void bx_lazyflags_entry::set_PF(bx_bool val)
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{
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Bit32u temp_pdb = (255 & result) ^ (!val);
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auxbits &= ~(LF_MASK_PDB);
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auxbits |= (temp_pdb << LF_BIT_PDB);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_PF (void) { set_PF(0); }
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BX_CPP_INLINE void bx_lazyflags_entry::assert_PF (void) { set_PF(1); }
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/// CF ////////////////////////////////////////
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BX_CPP_INLINE unsigned bx_lazyflags_entry::getB_CF(void) const
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{
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return (auxbits >> LF_BIT_CF) & 1;
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}
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BX_CPP_INLINE unsigned bx_lazyflags_entry::get_CF(void) const
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{
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return (auxbits & LF_MASK_CF);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::set_CF(bx_bool val)
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{
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bx_bool temp_of = getB_OF();
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set_flags_OxxxxC(temp_of, val);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::clear_CF(void)
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{
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bx_bool temp_of = getB_OF();
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set_flags_OxxxxC(temp_of, 0);
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}
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BX_CPP_INLINE void bx_lazyflags_entry::assert_CF(void)
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{
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bx_bool temp_of = getB_OF();
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set_flags_OxxxxC(temp_of, 1);
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}
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#endif // BX_LAZY_FLAGS_DEF
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