mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 23:37:46 -04:00
code review and optimizations
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@180 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz
parent
3a5e6cf847
commit
85a36a57a8
10 changed files with 540 additions and 364 deletions
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@ -20,18 +20,16 @@ int OpArith(int op)
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if (EaCanRead(tea,size)==0) return 1;
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if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;
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use=OpBase(op);
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use=OpBase(op,size);
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op, sea, tea); Cycles=4;
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EaCalc(10,0x0000, sea,size,1);
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EaCalc(11,0x003f, tea,size,1);
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EaRead(10, 10, sea,size,0,0,0);
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EaRead(11, 0, tea,size,0x003f,1);
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EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);
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EaCalcReadNoSE(-1,10,sea,size,0);
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if (size==0) shiftstr=",asl #24";
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else if (size==1) shiftstr=",asl #16";
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if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");
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if (size<2) ot(" mov r0,r0,asl %i\n",size?16:24);
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ot(";@ Do arithmetic:\n");
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@ -92,7 +90,7 @@ int OpAddq(int op)
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if (EaCanWrite(ea) ==0) return 1;
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if (size == 0 && EaAn(ea) ) return 1;
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use=OpBase(op,1);
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use=OpBase(op,size,1);
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if (num!=8) use|=0x0e00; // If num is not 8, use same handler
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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@ -104,8 +102,7 @@ int OpAddq(int op)
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if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit
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EaCalc(10,0x003f, ea,size,1);
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EaRead(10, 0, ea,size,0x003f,1);
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EaCalcReadNoSE(10,0,ea,size,0x003f);
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shift=32-(8<<size);
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@ -125,6 +122,8 @@ int OpAddq(int op)
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sprintf(count,"#0x%.4x",8<<shift);
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}
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if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
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if (type==0) ot(" adds r1,r0,%s\n",count);
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if (type==1) ot(" subs r1,r0,%s\n",count);
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@ -144,6 +143,8 @@ int OpArithReg(int op)
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{
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int use=0;
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int type=0,size=0,dir=0,rea=0,ea=0;
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char *asl="";
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char *strop=0;
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type=(op>>12)&5;
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rea =(op>> 9)&7;
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@ -158,26 +159,27 @@ int OpArithReg(int op)
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if (dir && EaCanWrite(ea)==0) return 1;
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if ((size==0||!(type&1))&&EaAn(ea)) return 1;
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use=OpBase(op);
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use=OpBase(op,size);
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use&=~0x0e00; // Use same opcode for Dn
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,ea); Cycles=4;
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ot(";@ Get r10=EA r11=EA value\n");
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EaCalc(10,0x003f, ea,size,1);
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EaRead(10, 11, ea,size,0x003f,1);
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ot(";@ Get r0=Register r1=Register value\n");
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EaCalc( 0,0x0e00,rea,size,1);
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EaRead( 0, 1,rea,size,0x0e00,1);
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EaCalcReadNoSE(dir?10:-1,0,ea,size,0x003f);
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EaCalcReadNoSE(dir?-1:10,1,rea,size,0x0e00);
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ot(";@ Do arithmetic:\n");
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if (type==0) ot(" orr ");
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if (type==1) ot(" subs ");
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if (type==4) ot(" and ");
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if (type==5) ot(" adds ");
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if (dir) ot("r1,r11,r1\n");
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else ot("r1,r1,r11\n");
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if (type==0) strop = "orr";
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if (type==1) strop = (char *) (dir ? "subs" : "rsbs");
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if (type==4) strop = "and";
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if (type==5) strop = "adds";
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if (size==0) asl=",asl #24";
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if (size==1) asl=",asl #16";
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if (size<2) ot(" mov r0,r0%s\n",asl);
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ot(" %s r1,r0,r1%s\n",strop,asl);
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if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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@ -185,8 +187,9 @@ int OpArithReg(int op)
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ot("\n");
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ot(";@ Save result:\n");
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if (dir) EaWrite(10, 1, ea,size,0x003f,1);
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else EaWrite( 0, 1,rea,size,0x0e00,1);
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if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);
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if (dir) EaWrite(10, 1, ea,size,0x003f,0,0);
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else EaWrite(10, 1,rea,size,0x0e00,0,0);
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if(rea==ea) {
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if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;
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@ -220,7 +223,7 @@ int OpMul(int op)
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// See if we can do this opcode:
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if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;
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use=OpBase(op);
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use=OpBase(op,1);
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use&=~0x0e00; // Use same for all registers
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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@ -228,17 +231,17 @@ int OpMul(int op)
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if(type) Cycles=54;
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else Cycles=sign?158:140;
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EaCalc(10,0x003f, ea, 1);
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EaRead(10, 10, ea, 1,0x003f);
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EaCalcReadNoSE(-1,0,ea,1,0x003f);
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EaCalc (0,0x0e00,rea, 2,1);
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EaRead (0, 2,rea, 2,0x0e00,1);
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EaCalc(10,0x0e00,rea, 2);
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EaRead(10, 2,rea, 2,0x0e00);
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ot(" movs r0,r0,asl #16\n");
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if (type==0) // div
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{
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// the manual says C is always cleared, but neither Musashi nor FAME do that
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//ot(" bic r9,r9,#0x20000000 ;@ always clear C\n");
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ot(" tst r10,r10\n");
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ot(" beq divzero%.4x ;@ division by zero\n",op);
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ot("\n");
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@ -246,7 +249,8 @@ int OpMul(int op)
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{
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ot(" mov r11,#0 ;@ r11 = 1 or 2 if the result is negative\n");
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ot(" orrmi r11,r11,#1\n");
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ot(" rsbmi r10,r10,#0 ;@ Make r10 positive\n");
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ot(" mov r0,r0,asr #16\n");
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ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");
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ot("\n");
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ot(" tst r2,r2\n");
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ot(" orrmi r11,r11,#2\n");
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@ -255,13 +259,12 @@ int OpMul(int op)
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}
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else
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{
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ot(" mov r10,r10,lsl #16 ;@ use only 16 bits of divisor\n");
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ot(" mov r10,r10,lsr #16\n");
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ot(" mov r0,r0,lsr #16 ;@ use only 16 bits of divisor\n");
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}
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ot(";@ Divide r2 by r10\n");
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ot(";@ Divide r2 by r0\n");
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ot(" mov r3,#0\n");
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ot(" mov r1,r10\n");
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ot(" mov r1,r0\n");
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ot("\n");
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ot(";@ Shift up divisor till it's just less than numerator\n");
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ot("Shift%.4x%s\n",op,ms?"":":");
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@ -274,7 +277,7 @@ int OpMul(int op)
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ot(" cmp r2,r1\n");
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ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");
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ot(" subcs r2,r2,r1\n");
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ot(" teq r1,r10\n");
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ot(" teq r1,r0\n");
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ot(" movne r1,r1,lsr #1\n");
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ot(" bne Divide%.4x\n",op);
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ot("\n");
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@ -314,33 +317,32 @@ int OpMul(int op)
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if (type==1)
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{
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char *shift="asr";
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ot(";@ Get 16-bit signs right:\n");
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if (sign==0) { ot(" mov r10,r10,lsl #16\n"); shift="lsr"; }
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ot(" mov r0,r0,%s #16\n",sign?"asr":"lsr");
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ot(" mov r2,r2,lsl #16\n");
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if (sign==0) ot(" mov r10,r10,lsr #16\n");
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ot(" mov r2,r2,%s #16\n",shift);
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ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");
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ot("\n");
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ot(" mul r1,r2,r10\n");
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ot(" mul r1,r2,r0\n");
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ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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OpGetFlags(0,0);
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}
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ot("\n");
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EaWrite(0, 1,rea, 2,0x0e00,1);
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EaWrite(10, 1,rea, 2,0x0e00,1);
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ot("endofop%.4x%s\n",op,ms?"":":");
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if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");
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OpEnd(ea);
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ot("divzero%.4x%s\n",op,ms?"":":");
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ot(" mov r0,#0x14 ;@ Divide by zero\n");
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ot(" bl Exception\n");
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Cycles+=38;
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OpEnd(ea);
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ot("\n");
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if (type==0) // div
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{
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ot("divzero%.4x%s\n",op,ms?"":":");
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ot(" mov r0,#0x14 ;@ Divide by zero\n");
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ot(" bl Exception\n");
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Cycles+=38;
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OpEnd(ea);
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ot("\n");
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}
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return 0;
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}
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@ -349,9 +351,8 @@ int OpMul(int op)
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int GetXBit(int subtract)
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{
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ot(";@ Get X bit:\n");
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ot(" ldrb r2,[r7,#0x45]\n");
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if (subtract) ot(" mvn r2,r2,lsl #28 ;@ Invert it\n");
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else ot(" mov r2,r2,lsl #28\n");
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ot(" ldr r2,[r7,#0x4c]\n");
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if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");
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ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");
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ot("\n");
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return 0;
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@ -362,34 +363,46 @@ int GetXBit(int subtract)
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int OpAbcd(int op)
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{
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int use=0;
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int type=0,sea=0,addr=0,dea=0;
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int type=0,sea=0,mem=0,dea=0;
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type=(op>>14)&1; // sbcd/abcd
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dea =(op>> 9)&7;
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addr=(op>> 3)&1;
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mem =(op>> 3)&1;
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sea = op &7;
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if (addr) { sea|=0x20; dea|=0x20; }
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if (mem) { sea|=0x20; dea|=0x20; }
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use=op&~0x0e07; // Use same opcode for all registers..
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if (sea==0x27||dea==0x27) use=op; // ..except -(a7)
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if (sea==0x27) use|=0x0007; // ___x.b -(a7)
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if (dea==0x27) use|=0x0e00; // ___x.b -(a7)
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,sea,dea); Cycles=6;
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EaCalc( 0,0x0007, sea,0,1);
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EaRead( 0, 10, sea,0,0x0007,1);
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EaCalc(11,0x0e00, dea,0,1);
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EaRead(11, 1, dea,0,0x0e00,1);
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if (mem)
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{
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ot(";@ Get src/dest EA vals\n");
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EaCalc (0,0x000f, sea,0,1);
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EaRead (0, 10, sea,0,0x000f,1);
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EaCalcReadNoSE(11,0,dea,0,0x1e00);
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}
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else
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{
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ot(";@ Get src/dest reg vals\n");
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EaCalcReadNoSE(-1,10,sea,0,0x0007);
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EaCalcReadNoSE(11,0,dea,0,0x0e00);
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ot(" mov r10,r10,asl #24\n");
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}
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ot(" mov r1,r0,asl #24\n\n");
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ot(" bic r9,r9,#0xb1000000 ;@ clear all flags except old Z\n");
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if (type)
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{
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ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");
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ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
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ot(" mov r3,#0x00f00000\n");
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ot(" and r2,r3,r1,lsr #4\n");
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ot(" tst r0,#2\n");
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ot(" tst r0,#0x20000000\n");
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ot(" and r0,r3,r10,lsr #4\n");
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ot(" add r0,r0,r2\n");
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ot(" addne r0,r0,#0x00100000\n");
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@ -413,10 +426,10 @@ int OpAbcd(int op)
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}
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else
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{
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ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");
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ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
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ot(" mov r3,#0x00f00000\n");
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ot(" and r2,r3,r10,lsr #4\n");
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ot(" tst r0,#2\n");
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ot(" tst r0,#0x20000000\n");
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ot(" and r0,r3,r1,lsr #4\n");
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ot(" sub r0,r0,r2\n");
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ot(" subne r0,r0,#0x00100000\n");
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@ -439,8 +452,8 @@ int OpAbcd(int op)
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ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");
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}
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ot(" mov r2,r9,lsr #28\n");
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ot(" strb r2,[r7,#0x45] ;@ Save X bit\n");
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ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
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ot("\n");
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EaWrite(11, 0, dea,0,0x0e00,1);
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OpEnd(sea,dea);
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@ -448,7 +461,7 @@ int OpAbcd(int op)
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return 0;
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}
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// 01008000 00eeeeee - nbcd <ea>
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// 01001000 00eeeeee - nbcd <ea>
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int OpNbcd(int op)
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{
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int use=0;
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@ -458,23 +471,22 @@ int OpNbcd(int op)
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if(EaCanWrite(ea)==0||EaAn(ea)) return 1;
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use=OpBase(op);
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use=OpBase(op,0);
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if(op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,ea); Cycles=6;
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if(ea >= 8) Cycles+=2;
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EaCalc(10,0x3f, ea,0,1);
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EaRead(10, 0, ea,0,0x3f,1);
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EaCalcReadNoSE(10,0,ea,0,0x003f);
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// this is rewrite of Musashi's code
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ot(" ldrb r2,[r7,#0x45]\n");
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ot(" tst r2,#2\n");
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ot(" mov r2,r0\n");
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ot(" addne r2,r0,#0x01000000 ;@ add X\n");
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ot(" ldr r2,[r7,#0x4c]\n");
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ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");
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ot(" mov r0,r0,asl #24\n");
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ot(" and r2,r2,#0x20000000\n");
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ot(" add r2,r0,r2,lsr #5 ;@ add X\n");
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ot(" rsbs r1,r2,#0x9a000000 ;@ do arithmetic\n");
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ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");
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ot(" orrmi r9,r9,#0x80000000 ;@ N\n");
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ot(" cmp r1,#0x9a000000\n");
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ot(" beq finish%.4x\n",op);
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@ -495,8 +507,7 @@ int OpNbcd(int op)
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EaWrite(10, 1, ea,0,0x3f,1);
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ot("finish%.4x%s\n",op,ms?"":":");
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ot(" mov r2,r9,lsr #28\n");
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ot(" strb r2, [r7,#0x45]\n");
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ot(" str r9,[r7,#0x4c] ;@ Save X\n");
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OpEnd(ea);
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@ -509,6 +520,7 @@ int OpAritha(int op)
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{
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int use=0;
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int type=0,size=0,sea=0,dea=0;
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char *asr="";
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// Suba/Cmpa/Adda/(invalid):
|
||||
type=(op>>13)&3; if (type>=3) return 1;
|
||||
|
|
@ -520,7 +532,7 @@ int OpAritha(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(sea,size)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use same opcode for An
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -528,18 +540,19 @@ int OpAritha(int op)
|
|||
if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;
|
||||
if(type==1) Cycles=6;
|
||||
|
||||
|
||||
// must calculate reg EA first, because of situations like: suba.w (A0)+, A0
|
||||
EaCalc (10,0x0e00, dea,2,1);
|
||||
EaRead (10, 11, dea,2,0x0e00);
|
||||
EaCalc (10,0x1e00, dea,2,1);
|
||||
EaRead (10, 11, dea,2,0x1e00);
|
||||
|
||||
EaCalc ( 0,0x003f, sea,size);
|
||||
EaRead ( 0, 0, sea,size,0x003f);
|
||||
EaCalc ( 0,0x003f, sea,size,1);
|
||||
EaRead ( 0, 0, sea,size,0x003f,1);
|
||||
|
||||
if (type==0) ot(" sub r11,r11,r0\n");
|
||||
if (type==1) ot(" cmp r11,r0 ;@ Defines NZCV\n");
|
||||
if (size<2) asr=(char *)(size?",asr #16":",asr #24");
|
||||
|
||||
if (type==0) ot(" sub r11,r11,r0%s\n",asr);
|
||||
if (type==1) ot(" cmp r11,r0%s ;@ Defines NZCV\n",asr);
|
||||
if (type==1) OpGetFlags(1,0); // Get Cmp flags
|
||||
if (type==2) ot(" add r11,r11,r0\n");
|
||||
if (type==2) ot(" add r11,r11,r0%s\n",asr);
|
||||
ot("\n");
|
||||
|
||||
if (type!=1) EaWrite(10, 11, dea,2,0x0e00,1);
|
||||
|
|
@ -555,8 +568,9 @@ int OpAddx(int op)
|
|||
{
|
||||
int use=0;
|
||||
int type=0,size=0,dea=0,sea=0,mem=0;
|
||||
char *asl="";
|
||||
|
||||
type=(op>>12)&5;
|
||||
type=(op>>14)&1;
|
||||
dea =(op>> 9)&7;
|
||||
size=(op>> 6)&3; if (size>=3) return 1;
|
||||
sea = op&7;
|
||||
|
|
@ -569,24 +583,35 @@ int OpAddx(int op)
|
|||
if(mem) { sea+=0x20; dea+=0x20; }
|
||||
|
||||
use=op&~0x0e07; // Use same opcode for Dn
|
||||
if (size==0&&(sea==0x27||dea==0x27)) use=op; // ___x.b -(a7)
|
||||
if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)
|
||||
if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea,dea); Cycles=4;
|
||||
if(size>=2) Cycles+=4;
|
||||
if(sea>=0x10) Cycles+=2;
|
||||
|
||||
ot(";@ Get r10=EA r11=EA value\n");
|
||||
EaCalc( 0,0x0007,sea,size,1);
|
||||
EaRead( 0, 11,sea,size,0x0007,1);
|
||||
ot(";@ Get r0=Register r1=Register value\n");
|
||||
EaCalc( 0,0x0e00,dea,size,1);
|
||||
EaRead( 0, 1,dea,size,0x0e00,1);
|
||||
if (mem)
|
||||
{
|
||||
ot(";@ Get src/dest EA vals\n");
|
||||
EaCalc (0,0x000f, sea,size,1);
|
||||
EaRead (0, 11, sea,size,0x000f,1);
|
||||
EaCalcReadNoSE(10,0,dea,size,0x1e00);
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(";@ Get src/dest reg vals\n");
|
||||
EaCalcReadNoSE(-1,11,sea,size,0x0007);
|
||||
EaCalcReadNoSE(10,0,dea,size,0x0e00);
|
||||
if (size<2) ot(" mov r11,r11,asl #%d\n\n",size?16:24);
|
||||
}
|
||||
|
||||
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
GetXBit(type==1);
|
||||
GetXBit(type==0);
|
||||
|
||||
if (type==5 && size<2)
|
||||
if (type==1 && size<2)
|
||||
{
|
||||
ot(";@ Make sure the carry bit will tip the balance:\n");
|
||||
ot(" mvn r2,#0\n");
|
||||
|
|
@ -594,10 +619,10 @@ int OpAddx(int op)
|
|||
ot("\n");
|
||||
}
|
||||
|
||||
if (type==1) ot(" sbcs r1,r1,r11\n");
|
||||
if (type==5) ot(" adcs r1,r1,r11\n");
|
||||
if (type==0) ot(" rscs r1,r11,r0%s\n",asl);
|
||||
if (type==1) ot(" adcs r1,r11,r0%s\n",asl);
|
||||
ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");
|
||||
OpGetFlags(type==1,1,0); // subtract
|
||||
OpGetFlags(type==0,1,0); // subtract
|
||||
if (size<2) {
|
||||
ot(" movs r2,r1,lsr #%i\n", size?16:24);
|
||||
ot(" orreq r9,r9,#0x40000000 ;@ add potentially missed Z\n");
|
||||
|
|
@ -606,7 +631,7 @@ int OpAddx(int op)
|
|||
ot("\n");
|
||||
|
||||
ot(";@ Save result:\n");
|
||||
EaWrite( 0, 1, dea,size,0x0e00,1);
|
||||
EaWrite(10, 1, dea,size,0x0e00,1);
|
||||
|
||||
OpEnd(sea,dea);
|
||||
|
||||
|
|
@ -619,6 +644,7 @@ int OpCmpEor(int op)
|
|||
{
|
||||
int rea=0,eor=0;
|
||||
int size=0,ea=0,use=0;
|
||||
char *asl="";
|
||||
|
||||
// Get EA and register EA
|
||||
rea=(op>>9)&7;
|
||||
|
|
@ -633,7 +659,7 @@ int OpCmpEor(int op)
|
|||
if (eor && EaCanWrite(ea)==0) return 1;
|
||||
if (EaAn(ea)&&(eor||size==0)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use 1 handler for register d0-7
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -646,18 +672,19 @@ int OpCmpEor(int op)
|
|||
}
|
||||
|
||||
ot(";@ Get EA into r10 and value into r0:\n");
|
||||
EaCalc (10,0x003f, ea,size,1);
|
||||
EaRead (10, 0, ea,size,0x003f,1);
|
||||
EaCalcReadNoSE(eor?10:-1,0,ea,size,0x003f);
|
||||
|
||||
ot(";@ Get register operand into r1:\n");
|
||||
EaCalc (1, 0x0e00, rea,size,1);
|
||||
EaRead (1, 1, rea,size,0x0e00,1);
|
||||
EaCalcReadNoSE(-1,1,rea,size,0x0e00);
|
||||
|
||||
if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
|
||||
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
if (eor==0) ot(" cmp r1,r0\n");
|
||||
if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);
|
||||
if (eor)
|
||||
{
|
||||
ot(" eor r1,r0,r1\n");
|
||||
ot(" eor r1,r0,r1%s\n",asl);
|
||||
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
||||
}
|
||||
|
||||
|
|
@ -674,6 +701,7 @@ int OpCmpEor(int op)
|
|||
int OpCmpm(int op)
|
||||
{
|
||||
int size=0,sea=0,dea=0,use=0;
|
||||
char *asl="";
|
||||
|
||||
// get size, get EAs
|
||||
size=(op>>6)&3; if (size>=3) return 1;
|
||||
|
|
@ -681,21 +709,24 @@ int OpCmpm(int op)
|
|||
dea=(op>>9)&0x3f;
|
||||
|
||||
use=op&~0x0e07; // Use 1 handler for all registers..
|
||||
if (size==0&&(sea==0x1f||dea==0x1f)) use=op; // ..except (a7)+
|
||||
if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+
|
||||
if (size==0&&dea==0x1f) use|=0x0e00;
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea); Cycles=4;
|
||||
|
||||
ot(";@ Get src operand into r10:\n");
|
||||
EaCalc (0,0x000f, sea,size,1);
|
||||
EaCalc (0,0x1e00, sea,size,1);
|
||||
EaRead (0, 10, sea,size,0x000f,1);
|
||||
|
||||
ot(";@ Get dst operand into r0:\n");
|
||||
EaCalc (0,0x1e00, dea,size,1);
|
||||
EaRead (0, 0, dea,size,0x1e00,1);
|
||||
EaCalcReadNoSE(-1,0,dea,size,0x1e00);
|
||||
|
||||
ot(" cmp r0,r10\n");
|
||||
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
||||
|
||||
ot(" rsbs r0,r10,r0%s\n",asl);
|
||||
OpGetFlags(1,0); // Cmp like subtract
|
||||
ot("\n");
|
||||
|
||||
OpEnd(sea);
|
||||
return 0;
|
||||
|
|
@ -721,19 +752,20 @@ int OpChk(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(ea,size)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use 1 handler for register d0-7
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=10;
|
||||
|
||||
ot(";@ Get EA into r10 and value into r0:\n");
|
||||
EaCalc (10,0x003f, ea,size,1);
|
||||
EaRead (10, 0, ea,size,0x003f,1);
|
||||
EaCalcReadNoSE(-1,0,ea,size,0x003f);
|
||||
|
||||
ot(";@ Get register operand into r1:\n");
|
||||
EaCalc (1, 0x0e00, rea,size,1);
|
||||
EaRead (1, 1, rea,size,0x0e00,1);
|
||||
EaCalcReadNoSE(-1,1,rea,size,0x0e00);
|
||||
|
||||
if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);
|
||||
if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);
|
||||
|
||||
ot(";@ get flags, including undocumented ones\n");
|
||||
ot(" and r3,r9,#0x80000000\n");
|
||||
|
|
@ -744,12 +776,11 @@ int OpChk(int op)
|
|||
ot(" bmi chktrap%.4x\n",op);
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
ot(" bic r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" cmp r1,r0\n");
|
||||
ot(" bicgt r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" bgt chktrap%.4x\n",op);
|
||||
|
||||
ot(";@ old N remains\n");
|
||||
ot(" bic r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" orr r9,r9,r3\n");
|
||||
OpEnd(ea);
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue