BITSCAN lazy flags evaluation optimization
This commit is contained in:
Stanislav Shwartsman
parent
1a55835155
commit
aa00d33640
@ -1,5 +1,5 @@
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/////////////////////////////////////////////////////////////////////////
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// $Id: bit.cc,v 1.42 2007-11-25 20:22:06 sshwarts Exp $
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// $Id: bit.cc,v 1.43 2007-11-29 21:52:16 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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@ -276,7 +276,8 @@ void BX_CPU_C::BSF_GwEw(bxInstruction_c *i)
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op2_16 >>= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_16(op1_16, BX_INSTR_BITSCAN16);
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SET_FLAGS_OSZAPC_LOGIC_16(op1_16);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_16BIT_REG(i->nnn(), op1_16);
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@ -307,7 +308,8 @@ void BX_CPU_C::BSF_GdEd(bxInstruction_c *i)
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op2_32 >>= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_32(op1_32, BX_INSTR_BITSCAN32);
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SET_FLAGS_OSZAPC_LOGIC_32(op1_32);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_32BIT_REGZ(i->nnn(), op1_32);
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@ -339,7 +341,8 @@ void BX_CPU_C::BSF_GqEq(bxInstruction_c *i)
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op2_64 >>= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_64(op1_64, BX_INSTR_BITSCAN64);
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SET_FLAGS_OSZAPC_LOGIC_64(op1_64);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_64BIT_REG(i->nnn(), op1_64);
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@ -370,7 +373,8 @@ void BX_CPU_C::BSR_GwEw(bxInstruction_c *i)
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op2_16 <<= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_16(op1_16, BX_INSTR_BITSCAN16);
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SET_FLAGS_OSZAPC_LOGIC_16(op1_16);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_16BIT_REG(i->nnn(), op1_16);
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@ -401,7 +405,8 @@ void BX_CPU_C::BSR_GdEd(bxInstruction_c *i)
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op2_32 <<= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_32(op1_32, BX_INSTR_BITSCAN32);
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SET_FLAGS_OSZAPC_LOGIC_32(op1_32);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_32BIT_REGZ(i->nnn(), op1_32);
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@ -433,7 +438,8 @@ void BX_CPU_C::BSR_GqEq(bxInstruction_c *i)
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op2_64 <<= 1;
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}
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SET_FLAGS_OSZAPC_RESULT_64(op1_64, BX_INSTR_BITSCAN64);
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SET_FLAGS_OSZAPC_LOGIC_64(op1_64);
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clear_ZF();
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/* now write result back to destination */
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BX_WRITE_64BIT_REG(i->nnn(), op1_64);
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@ -1,5 +1,5 @@
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/////////////////////////////////////////////////////////////////////////
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// $Id: lazy_flags.cc,v 1.37 2007-11-29 21:45:10 sshwarts Exp $
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// $Id: lazy_flags.cc,v 1.38 2007-11-29 21:52:16 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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@ -161,11 +161,8 @@ bx_bool BX_CPU_C::get_CFLazy(void)
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case BX_INSTR_LOGIC8:
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case BX_INSTR_LOGIC16:
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case BX_INSTR_LOGIC32:
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_BITSCAN32:
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#if BX_SUPPORT_X86_64
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case BX_INSTR_LOGIC64:
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case BX_INSTR_BITSCAN64:
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#endif
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cf = 0;
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break;
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@ -366,11 +363,8 @@ bx_bool BX_CPU_C::get_AFLazy(void)
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case BX_INSTR_LOGIC8:
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case BX_INSTR_LOGIC16:
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case BX_INSTR_LOGIC32:
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_BITSCAN32:
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#if BX_SUPPORT_X86_64
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case BX_INSTR_LOGIC64:
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case BX_INSTR_BITSCAN64:
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case BX_INSTR_SAR64:
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case BX_INSTR_SHR64:
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case BX_INSTR_SHRD64:
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@ -521,13 +515,6 @@ bx_bool BX_CPU_C::get_ZFLazy(void)
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zf = (BX_CPU_THIS_PTR oszapc.result_64 == 0);
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break;
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#endif
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_BITSCAN32:
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#if BX_SUPPORT_X86_64
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case BX_INSTR_BITSCAN64:
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#endif
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zf = 0;
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break;
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default:
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zf = 0;
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BX_PANIC(("get_ZF: OSZAPC: unknown instr"));
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@ -606,7 +593,6 @@ bx_bool BX_CPU_C::get_SFLazy(void)
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case BX_INSTR_SHR16:
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case BX_INSTR_SHRD16:
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case BX_INSTR_SHL16:
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_IMUL16:
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case BX_INSTR_MUL16:
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sf = (BX_CPU_THIS_PTR oszapc.result_16 >= 0x8000);
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@ -621,7 +607,6 @@ bx_bool BX_CPU_C::get_SFLazy(void)
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case BX_INSTR_SHR32:
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case BX_INSTR_SHRD32:
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case BX_INSTR_SHL32:
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case BX_INSTR_BITSCAN32:
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case BX_INSTR_IMUL32:
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case BX_INSTR_MUL32:
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sf = (BX_CPU_THIS_PTR oszapc.result_32 >= 0x80000000);
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@ -637,7 +622,6 @@ bx_bool BX_CPU_C::get_SFLazy(void)
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case BX_INSTR_SHR64:
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case BX_INSTR_SHRD64:
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case BX_INSTR_SHL64:
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case BX_INSTR_BITSCAN64:
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case BX_INSTR_IMUL64:
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case BX_INSTR_MUL64:
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sf = (BX_CPU_THIS_PTR oszapc.result_64 >= BX_CONST64(0x8000000000000000));
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@ -777,14 +761,11 @@ bx_bool BX_CPU_C::get_OFLazy(void)
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case BX_INSTR_LOGIC8:
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case BX_INSTR_LOGIC16:
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case BX_INSTR_LOGIC32:
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_BITSCAN32:
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case BX_INSTR_SAR8:
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case BX_INSTR_SAR16:
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case BX_INSTR_SAR32:
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#if BX_SUPPORT_X86_64
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case BX_INSTR_LOGIC64:
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case BX_INSTR_BITSCAN64:
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case BX_INSTR_SAR64:
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#endif
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of = 0;
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@ -998,7 +979,6 @@ bx_bool BX_CPU_C::get_PFLazy(void)
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case BX_INSTR_SHR16:
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case BX_INSTR_SHRD16:
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case BX_INSTR_SHL16:
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case BX_INSTR_BITSCAN16:
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case BX_INSTR_IMUL16:
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case BX_INSTR_MUL16:
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pf = bx_parity_lookup[(Bit8u) BX_CPU_THIS_PTR oszapc.result_16];
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@ -1013,7 +993,6 @@ bx_bool BX_CPU_C::get_PFLazy(void)
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case BX_INSTR_SHR32:
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case BX_INSTR_SHRD32:
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case BX_INSTR_SHL32:
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case BX_INSTR_BITSCAN32:
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case BX_INSTR_IMUL32:
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case BX_INSTR_MUL32:
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pf = bx_parity_lookup[(Bit8u) BX_CPU_THIS_PTR oszapc.result_32];
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@ -1029,7 +1008,6 @@ bx_bool BX_CPU_C::get_PFLazy(void)
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case BX_INSTR_SHR64:
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case BX_INSTR_SHRD64:
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case BX_INSTR_SHL64:
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case BX_INSTR_BITSCAN64:
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case BX_INSTR_IMUL64:
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case BX_INSTR_MUL64:
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pf = bx_parity_lookup[(Bit8u) BX_CPU_THIS_PTR oszapc.result_64];
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@ -1,5 +1,5 @@
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/////////////////////////////////////////////////////////////////////////
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// $Id: lazy_flags.h,v 1.24 2007-11-20 17:15:33 sshwarts Exp $
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// $Id: lazy_flags.h,v 1.25 2007-11-29 21:52:16 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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@ -79,10 +79,10 @@
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#define BX_INSTR_LOGIC32 31
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#define BX_INSTR_LOGIC64 32
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// BX_INSTR_BITSCAN8 not exists, leave number for alignment
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#define BX_INSTR_BITSCAN16 34
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#define BX_INSTR_BITSCAN32 35
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#define BX_INSTR_BITSCAN64 36
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// BX_INSTR_SHRD8 not exists, leave number for alignment
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#define BX_INSTR_SHRD16 34
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#define BX_INSTR_SHRD32 35
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#define BX_INSTR_SHRD64 36
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#define BX_INSTR_SHL8 37
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#define BX_INSTR_SHL16 38
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@ -109,12 +109,6 @@
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#define BX_INSTR_IMUL32 55
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#define BX_INSTR_IMUL64 56
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// BX_INSTR_SHRD8 not exists, leave number for alignment
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#define BX_INSTR_SHRD16 58
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#define BX_INSTR_SHRD32 59
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#define BX_INSTR_SHRD64 60
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#define BX_LF_INDEX_OSZAPC 1
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#define BX_LF_INDEX_OSZAP 2
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