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more accuracy fixes

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@186 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-07-07 14:54:33 +00:00
parent 2d0b15bb2c
commit 1c88b865ce
5 changed files with 57 additions and 34 deletions
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12
cpu/Cyclone/OpBranch.cpp
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@ -11,8 +11,7 @@ static void CheckPc(int reg)
ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n");
ot(" mov r4,r0\n");
#else
if (reg != 4)
ot(" mov r4,r%i\n", reg);
ot(" bic r4,r%d,#1\n",reg); // we do not emulate address errors
#endif
ot("\n");
}
@ -194,7 +193,7 @@ int Op4E70(int op)
case 6: // trapv
OpStart(op,0x10); Cycles=4;
ot(" tst r9,#0x10000000\n");
ot(" subne r5,r5,#%i\n",30);
ot(" subne r5,r5,#%i\n",34);
ot(" movne r0,#0x1c ;@ TRAPV exception\n");
ot(" blne Exception\n");
OpEnd(0x10);
@ -336,6 +335,7 @@ int OpDbra(int op)
ot(" addeq r4,r4,#2 ;@ Skip branch offset\n");
ot(" subeq r5,r5,#4 ;@ additional cycles\n");
ot(" addne r4,r4,r0 ;@ r4 = New PC\n");
ot(" bic r4,r4,#1\n"); // we do not emulate address errors
ot("\n");
#endif
Cycles=12-2;
@ -384,6 +384,7 @@ int OpBranch(int op)
if (offset==0) size=1;
if (offset==-1) size=2;
if (size==2) size=0; // 000 model does not support long displacement
if (size) use=op; // 16-bit or 32-bit
else use=(op&0xff00)+1; // Use same opcode for all 8-bit branches
@ -451,6 +452,8 @@ int OpBranch(int op)
Cycles=18; // always 18
}
ot(" add r0,r4,r11%s ;@ r4 = New PC\n",asr_r11);
#if USE_CHECKPC_CALLBACK && USE_CHECKPC_OFFSETBITS_8
if (offset!=0 && offset!=-1) checkpc=1;
#endif
@ -462,12 +465,11 @@ int OpBranch(int op)
#endif
if (checkpc)
{
ot(" add r0,r4,r11%s ;@ r4 = New PC\n",asr_r11);
CheckPc(0);
}
else
{
ot(" add r4,r4,r11%s ;@ r4 = New PC\n",asr_r11);
ot(" bic r4,r0,#1\n"); // we do not emulate address errors
ot("\n");
}