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optimization

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This commit is contained in:
Stanislav Shwartsman 2010-02-26 23:09:30 +00:00
parent 5b6a14656d
commit fd0f428263
1 changed files with 5 additions and 5 deletions
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10
bochs/cpu/shift16.cc
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@ -1,5 +1,5 @@
///////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////
// $Id: shift16.cc,v 1.52 2009-12-04 16:53:12 sshwarts Exp $ // $Id: shift16.cc,v 1.53 2010-02-26 23:09:30 sshwarts Exp $
///////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2001-2009 The Bochs Project // Copyright (C) 2001-2009 The Bochs Project
@ -153,7 +153,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EwGwM(bxInstruction_c *i)
SET_FLAGS_OSZAPC_LOGIC_16(result_16); SET_FLAGS_OSZAPC_LOGIC_16(result_16);
cf = (op1_16 >> (count - 1)) & 0x1; cf = (op1_16 >> (count - 1)) & 0x1;
of = (((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15 of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15
SET_FLAGS_OxxxxC(of, cf); SET_FLAGS_OxxxxC(of, cf);
} }
@ -194,7 +194,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EwGwR(bxInstruction_c *i)
SET_FLAGS_OSZAPC_LOGIC_16(result_16); SET_FLAGS_OSZAPC_LOGIC_16(result_16);
cf = (op1_16 >> (count - 1)) & 0x1; cf = (op1_16 >> (count - 1)) & 0x1;
of = (((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15 of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15
SET_FLAGS_OxxxxC(of, cf); SET_FLAGS_OxxxxC(of, cf);
} }
@ -382,7 +382,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::RCR_Ew(bxInstruction_c *i)
} }
cf = (op1_16 >> (count - 1)) & 0x1; cf = (op1_16 >> (count - 1)) & 0x1;
of = (((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result15 ^ result14 of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result15 ^ result14
SET_FLAGS_OxxxxC(of, cf); SET_FLAGS_OxxxxC(of, cf);
} }
@ -470,7 +470,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHR_Ew(bxInstruction_c *i)
cf = (op1_16 >> (count - 1)) & 0x1; cf = (op1_16 >> (count - 1)) & 0x1;
// note, that of == result15 if count == 1 and // note, that of == result15 if count == 1 and
// of == 0 if count >= 2 // of == 0 if count >= 2
of = (((result_16 << 1) ^ result_16) >> 15) & 0x1; of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1;
SET_FLAGS_OSZAPC_LOGIC_16(result_16); SET_FLAGS_OSZAPC_LOGIC_16(result_16);
SET_FLAGS_OxxxxC(of, cf); SET_FLAGS_OxxxxC(of, cf);