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code review and optimizations

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@180 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-07-03 19:23:12 +00:00
parent 3a5e6cf847
commit 85a36a57a8
10 changed files with 540 additions and 364 deletions
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59
cpu/Cyclone/OpLogic.cpp
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@ -23,7 +23,7 @@ int OpBtstReg(int op)
if (EaCanWrite(tea)==0) return 1;
}
use=OpBase(op);
use=OpBase(op,size);
use&=~0x0e00; // Use same handler for all registers
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
@ -36,13 +36,9 @@ int OpBtstReg(int op)
if(size>=2) Cycles+=2;
}
EaCalc (10,0x0e00,sea,0,0,0);
EaRead (10, 10,sea,0,0x0e00,0,0);
EaCalcReadNoSE(-1,10,sea,0,0x0e00);
EaCalc ( 0,0x003f,tea,size,0,0);
if (type>0)
ot(" mov r11,r0\n");
EaRead ( 0, 0,tea,size,0x003f,0,0);
EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);
if (tea>=0x10)
ot(" and r10,r10,#7 ;@ mem - do mod 8\n"); // size always 0
@ -89,14 +85,13 @@ int OpBtstImm(int op)
if (EaCanWrite(tea)==0) return 1;
}
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op,sea,tea);
ot("\n");
EaCalc ( 0,0x0000,sea,0,0,0);
EaRead ( 0, 0,sea,0,0,0,0);
EaCalcReadNoSE(-1,0,sea,0,0);
ot(" mov r10,#1\n");
ot(" bic r9,r9,#0x40000000 ;@ Blank Z flag\n");
if (tea>=0x10)
@ -112,8 +107,7 @@ int OpBtstImm(int op)
if(size>=2) Cycles+=2;
}
EaCalc (11,0x003f,tea,size,0,0);
EaRead (11, 0,tea,size,0x003f,0,0);
EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);
ot(" tst r0,r10 ;@ Do arithmetic\n");
ot(" orreq r9,r9,#0x40000000 ;@ Get Z flag\n");
ot("\n");
@ -146,7 +140,7 @@ int OpNeg(int op)
if (EaCanRead (ea,size)==0||EaAn(ea)) return 1;
if (EaCanWrite(ea )==0) return 1;
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op,ea); Cycles=size<2?4:6;
@ -162,7 +156,7 @@ int OpNeg(int op)
EaCalc (10,0x003f,ea,size,0,0);
if (type!=1) EaRead (10,0,ea,size,0x003f,0,0); // Don't need to read for 'clr' (or do we, for dummy read?)
if (type!=1) EaRead (10,0,ea,size,0x003f,0,0); // Don't need to read for 'clr' (or do we, for a dummy read?)
if (type==1) ot("\n");
if (type==0)
@ -260,7 +254,7 @@ int OpTst(int op)
// See if we can do this opcode:
if (EaCanWrite(sea)==0||EaAn(sea)) return 1;
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op,sea); Cycles=4;
@ -288,7 +282,7 @@ int OpExt(int op)
size=(op>>6)&1;
shift=32-(8<<size);
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op); Cycles=4;
@ -328,7 +322,7 @@ int OpSet(int op)
// See if we can do this opcode:
if (EaCanWrite(ea)==0) return 1;
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op,ea); Cycles=8;
@ -383,7 +377,7 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
if (usereg)
{
ot(";@ Use Dn for count:\n");
ot(" and r2,r8,#7<<9\n");
ot(" and r2,r8,#0x0e00\n");
ot(" ldr r2,[r7,r2,lsr #7]\n");
ot(" and r2,r2,#63\n");
ot("\n");
@ -426,12 +420,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
if (usereg) { // store X only if count is not 0
ot(" cmp %s,#0 ;@ shifting by 0?\n",pct);
ot(" biceq r9,r9,#0x20000000 ;@ if so, clear carry\n");
ot(" movne r1,r9,lsr #28\n");
ot(" strneb r1,[r7,#0x45] ;@ else Save X bit\n");
ot(" strne r9,[r7,#0x4c] ;@ else Save X bit\n");
} else {
// count will never be 0 if we use immediate
ot(" mov r1,r9,lsr #28\n");
ot(" strb r1,[r7,#0x45] ;@ Save X bit\n");
ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
}
if (type==0 && dir) {
@ -462,10 +454,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
ot(" movs r0,r0,rrx\n");
OpGetFlags(0,1);
} else {
ot(" ldrb r3,[r7,#0x45]\n");
ot(" ldr r3,[r7,#0x4c]\n");
ot(" movs r0,r0,lsl #1\n");
OpGetFlags(0,1);
ot(" tst r3,#2\n");
ot(" tst r3,#0x20000000\n");
ot(" orrne r0,r0,#0x%x\n", 1<<(32-wide));
ot(" bicne r9,r9,#0x40000000 ;@ clear Z in case it got there\n");
}
@ -503,10 +495,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
ot(" orr r0,r3,r0 ;@ r0=Rotated value\n");
ot(";@ Insert X bit into r2-1:\n");
ot(" ldrb r3,[r7,#0x45]\n");
ot(" ldr r3,[r7,#0x4c]\n");
ot(" sub r2,r2,#1\n");
ot(" and r3,r3,#2\n");
ot(" mov r3,r3,lsr #1\n");
ot(" and r3,r3,#0x20000000\n");
ot(" mov r3,r3,lsr #29\n");
ot(" orr r0,r0,r3,lsl r2\n");
ot("\n");
@ -517,15 +509,14 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
ot(" bicne r9,r9,#0x40000000 ;@ make sure we didn't mess Z\n");
}
if (usereg) { // store X only if count is not 0
ot(" mov r2,r9,lsr #28\n");
ot(" strb r2,[r7,#0x45] ;@ if not 0, Save X bit\n");
ot(" str r9,[r7,#0x4c] ;@ if not 0, Save X bit\n");
ot(" b nozerox%.4x\n",op);
ot("norotx%.4x%s\n",op,ms?"":":");
ot(" ldrb r2,[r7,#0x45]\n");
ot(" ldr r2,[r7,#0x4c]\n");
ot(" adds r0,r0,#0 ;@ Defines NZ, clears CV\n");
OpGetFlags(0,0);
ot(" and r2,r2,#2\n");
ot(" orr r9,r9,r2,lsl #28 ;@ C = old_X\n");
ot(" and r2,r2,#0x20000000\n");
ot(" orr r9,r9,r2 ;@ C = old_X\n");
ot("nozerox%.4x%s\n",op,ms?"":":");
}
@ -642,7 +633,7 @@ int OpAsrEa(int op)
if (EaCanRead(ea,0)==0) return 1;
if (EaCanWrite(ea)==0) return 1;
use=OpBase(op);
use=OpBase(op,size);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
OpStart(op,ea); Cycles=6; // EmitAsr() will add 2
@ -668,7 +659,7 @@ int OpTas(int op, int gen_special)
// See if we can do this opcode:
if (EaCanWrite(ea)==0 || EaAn(ea)) return 1;
use=OpBase(op);
use=OpBase(op,0);
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
if (!gen_special) OpStart(op,ea);