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small optimization in cpu_loop with trace cache

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This commit is contained in:
Stanislav Shwartsman 2008-01-28 20:09:40 +00:00
parent 8aca8b4bd7
commit 8653095520
1 changed files with 11 additions and 11 deletions
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22
bochs/cpu/cpu.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: cpu.cc,v 1.204 2008-01-22 16:20:30 sshwarts Exp $
// $Id: cpu.cc,v 1.205 2008-01-28 20:09:40 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -103,11 +103,6 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
while (1) {
#if BX_SUPPORT_TRACE_CACHE
// clear stop trace magic indication that probably was set by branch32/64
BX_CPU_THIS_PTR async_event &= ~BX_ASYNC_EVENT_STOP_TRACE;
#endif
// First check on events which occurred for previous instructions
// (traps) and ones which are asynchronous to the CPU
// (hardware interrupts).
@ -118,6 +113,8 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
}
}
no_async_event:
Bit32u eipBiased = RIP + BX_CPU_THIS_PTR eipPageBias;
if (eipBiased >= BX_CPU_THIS_PTR eipPageWindowSize) {
@ -170,12 +167,15 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
CHECK_MAX_INSTRUCTIONS(max_instr_count);
#if BX_SUPPORT_TRACE_CACHE
if (--length == 0) break;
if (BX_CPU_THIS_PTR async_event) {
// clear stop trace magic indication that probably was set by branch32/64
BX_CPU_THIS_PTR async_event &= ~BX_ASYNC_EVENT_STOP_TRACE;
break;
}
if (currPageWriteStamp != *(BX_CPU_THIS_PTR currPageWriteStampPtr))
break; // probably it is self modifying code ...
if (BX_CPU_THIS_PTR async_event) break;
// check for end of the trace and self modifying code
if ((--length == 0) || currPageWriteStamp != *(BX_CPU_THIS_PTR currPageWriteStampPtr))
goto no_async_event;
}
#endif
} // while (1)