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Slimmed-down ModRegRM decoding (at some potential performance cost)

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This commit is contained in:
Jeff Parsons 2016-03-07 15:34:28 -08:00
commit 49ca936a18
179 changed files with 6200 additions and 57074 deletions
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137
modules/pcjs/lib/x86op0f.js
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@ -43,11 +43,11 @@ if (NODE) {
*/
X86.opGRP6 = function()
{
var bModRM = this.getIPByte();
var bModRM = this.peekIPByte();
if ((bModRM & 0x38) < 0x10) { // possible reg values: 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38
this.opFlags |= X86.OPFLAG.NOREAD;
}
this.aOpModGrpWord[bModRM].call(this, this.aOpGrp6, X86.fnSRCNone);
this.decodeModGrpWord.call(this, this.aOpGrp6, X86.fnSRCNone);
};
/**
@ -57,11 +57,11 @@ X86.opGRP6 = function()
*/
X86.opGRP7 = function()
{
var bModRM = this.getIPByte();
var bModRM = this.peekIPByte();
if (!(bModRM & 0x10)) {
this.opFlags |= X86.OPFLAG.NOREAD;
}
this.aOpModGrpWord[bModRM].call(this, X86.aOpGrp7, X86.fnSRCNone);
this.decodeModGrpWord.call(this, X86.aOpGrp7, X86.fnSRCNone);
};
/**
@ -80,7 +80,7 @@ X86.opLAR = function()
X86.opInvalid.call(this);
return;
}
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnLAR);
this.decodeModRegWord.call(this, X86.fnLAR);
};
/**
@ -99,7 +99,7 @@ X86.opLSL = function()
X86.opInvalid.call(this);
return;
}
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnLSL);
this.decodeModRegWord.call(this, X86.fnLSL);
};
/**
@ -567,6 +567,7 @@ X86.opMOVdr = function()
}
this.nStepCycles -= (iDst < 4? 22 : 14);
/*
* TODO: Implement BACKTRACK for this instruction (although Debug registers are not likely to be a conduit for interesting data).
*/
@ -1214,7 +1215,7 @@ X86.opPOPFS = function()
*/
X86.opBT = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, X86.fnBTMem);
this.decodeModMemWord.call(this, X86.fnBTMem);
if (this.regEA !== X86.ADDR_INVALID) this.nStepCycles -= 6;
};
@ -1227,7 +1228,7 @@ X86.opBT = function()
*/
X86.opSHLDn = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, this.sizeData == 2? X86.fnSHLDwi : X86.fnSHLDdi);
this.decodeModMemWord.call(this, this.sizeData == 2? X86.fnSHLDwi : X86.fnSHLDdi);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 7);
};
@ -1240,7 +1241,7 @@ X86.opSHLDn = function()
*/
X86.opSHLDcl = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, this.sizeData == 2? X86.fnSHLDwCL : X86.fnSHLDdCL);
this.decodeModMemWord.call(this, this.sizeData == 2? X86.fnSHLDwCL : X86.fnSHLDdCL);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 7);
};
@ -1253,7 +1254,7 @@ X86.opSHLDcl = function()
*/
X86.opXBTS = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnXBTS);
this.decodeModRegWord.call(this, X86.fnXBTS);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 6 : 13);
};
@ -1266,7 +1267,7 @@ X86.opXBTS = function()
*/
X86.opIBTS = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, X86.fnIBTS);
this.decodeModMemWord.call(this, X86.fnIBTS);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 12 : 19);
};
@ -1319,7 +1320,7 @@ X86.opPOPGS = function()
*/
X86.opBTS = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, X86.fnBTSMem);
this.decodeModMemWord.call(this, X86.fnBTSMem);
if (this.regEA !== X86.ADDR_INVALID) this.nStepCycles -= 5;
};
@ -1332,7 +1333,7 @@ X86.opBTS = function()
*/
X86.opSHRDn = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, this.sizeData == 2? X86.fnSHRDwi : X86.fnSHRDdi);
this.decodeModMemWord.call(this, this.sizeData == 2? X86.fnSHRDwi : X86.fnSHRDdi);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 7);
};
@ -1345,7 +1346,7 @@ X86.opSHRDn = function()
*/
X86.opSHRDcl = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, this.sizeData == 2? X86.fnSHRDwCL : X86.fnSHRDdCL);
this.decodeModMemWord.call(this, this.sizeData == 2? X86.fnSHRDwCL : X86.fnSHRDdCL);
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 7);
};
@ -1358,7 +1359,7 @@ X86.opSHRDcl = function()
*/
X86.opIMUL = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, this.sizeData == 2? X86.fnIMULrw : X86.fnIMULrd);
this.decodeModRegWord.call(this, this.sizeData == 2? X86.fnIMULrw : X86.fnIMULrd);
};
/**
@ -1372,7 +1373,7 @@ X86.opIMUL = function()
*/
X86.opLSS = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnLSS);
this.decodeModRegWord.call(this, X86.fnLSS);
};
/**
@ -1384,7 +1385,7 @@ X86.opLSS = function()
*/
X86.opBTR = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, X86.fnBTRMem);
this.decodeModMemWord.call(this, X86.fnBTRMem);
if (this.regEA !== X86.ADDR_INVALID) this.nStepCycles -= 5;
};
@ -1399,7 +1400,7 @@ X86.opBTR = function()
*/
X86.opLFS = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnLFS);
this.decodeModRegWord.call(this, X86.fnLFS);
};
/**
@ -1413,7 +1414,7 @@ X86.opLFS = function()
*/
X86.opLGS = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnLGS);
this.decodeModRegWord.call(this, X86.fnLGS);
};
/**
@ -1425,36 +1426,8 @@ X86.opLGS = function()
*/
X86.opMOVZXb = function()
{
/*
* The ModRegByte handlers update the registers in the 1st column, but we need to update those in the 2nd column.
*
* 000: AL -> 000: AX
* 001: CL -> 001: CX
* 010: DL -> 010: DX
* 011: BL -> 011: BX
* 100: AH -> 100: SP
* 101: CH -> 101: BP
* 110: DH -> 110: SI
* 111: BH -> 111: DI
*/
var temp;
var bModRM = this.getIPByte();
var reg = (bModRM & 0x38) >> 3;
switch(reg) {
case 0x4:
temp = this.regEAX;
break;
case 0x5:
temp = this.regECX;
break;
case 0x6:
temp = this.regEDX;
break;
case 0x7:
temp = this.regEBX;
break;
}
this.aOpModRegByte[bModRM].call(this, X86.fnMOVX);
this.decodeModRegByte.call(this, X86.fnMOVXb);
var reg = (this.bModRM & 0x38) >> 3;
switch(reg) {
case 0x0:
this.regEAX = (this.regEAX & ~this.maskData) | (this.regEAX & 0xff);
@ -1470,19 +1443,19 @@ X86.opMOVZXb = function()
break;
case 0x4:
this.regESP = (this.regESP & ~this.maskData) | ((this.regEAX >> 8) & 0xff);
this.regEAX = temp;
this.regEAX = this.regXX;
break;
case 0x5:
this.regEBP = (this.regEBP & ~this.maskData) | ((this.regECX >> 8) & 0xff);
this.regECX = temp;
this.regECX = this.regXX;
break;
case 0x6:
this.regESI = (this.regESI & ~this.maskData) | ((this.regEDX >> 8) & 0xff);
this.regEDX = temp;
this.regEDX = this.regXX;
break;
case 0x7:
this.regEDI = (this.regEDI & ~this.maskData) | ((this.regEBX >> 8) & 0xff);
this.regEBX = temp;
this.regEBX = this.regXX;
break;
}
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 6);
@ -1497,10 +1470,9 @@ X86.opMOVZXb = function()
*/
X86.opMOVZXw = function()
{
var bModRM = this.getIPByte();
this.setDataSize(2);
this.aOpModRegWord[bModRM].call(this, X86.fnMOVX);
switch((bModRM & 0x38) >> 3) {
this.decodeModRegWord.call(this, X86.fnMOVX);
switch((this.bModRM & 0x38) >> 3) {
case 0x0:
this.regEAX = (this.regEAX & 0xffff);
break;
@ -1536,7 +1508,7 @@ X86.opMOVZXw = function()
*/
X86.opGRP8 = function()
{
this.aOpModGrpWord[this.getIPByte()].call(this, X86.aOpGrp8, this.getIPByte);
this.decodeModGrpWord.call(this, X86.aOpGrp8, this.getIPByte);
};
/**
@ -1548,7 +1520,7 @@ X86.opGRP8 = function()
*/
X86.opBTC = function()
{
this.aOpModMemWord[this.getIPByte()].call(this, X86.fnBTCMem);
this.decodeModMemWord.call(this, X86.fnBTCMem);
if (this.regEA !== X86.ADDR_INVALID) this.nStepCycles -= 5;
};
@ -1561,7 +1533,7 @@ X86.opBTC = function()
*/
X86.opBSF = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnBSF);
this.decodeModRegWord.call(this, X86.fnBSF);
};
/**
@ -1573,7 +1545,7 @@ X86.opBSF = function()
*/
X86.opBSR = function()
{
this.aOpModRegWord[this.getIPByte()].call(this, X86.fnBSR);
this.decodeModRegWord.call(this, X86.fnBSR);
};
/**
@ -1585,36 +1557,8 @@ X86.opBSR = function()
*/
X86.opMOVSXb = function()
{
/*
* The ModRegByte handlers update the registers in the 1st column, but we need to update those in the 2nd column.
*
* 000: AL -> 000: AX
* 001: CL -> 001: CX
* 010: DL -> 010: DX
* 011: BL -> 011: BX
* 100: AH -> 100: SP
* 101: CH -> 101: BP
* 110: DH -> 110: SI
* 111: BH -> 111: DI
*/
var temp;
var bModRM = this.getIPByte();
var reg = (bModRM & 0x38) >> 3;
switch(reg) {
case 0x4:
temp = this.regEAX;
break;
case 0x5:
temp = this.regECX;
break;
case 0x6:
temp = this.regEDX;
break;
case 0x7:
temp = this.regEBX;
break;
}
this.aOpModRegByte[bModRM].call(this, X86.fnMOVX);
this.decodeModRegByte.call(this, X86.fnMOVXb);
var reg = (this.bModRM & 0x38) >> 3;
switch(reg) {
case 0x0:
this.regEAX = (this.regEAX & ~this.maskData) | ((((this.regEAX & 0xff) << 24) >> 24) & this.maskData);
@ -1630,19 +1574,19 @@ X86.opMOVSXb = function()
break;
case 0x4:
this.regESP = (this.regESP & ~this.maskData) | (((this.regEAX << 16) >> 24) & this.maskData);
this.regEAX = temp;
this.regEAX = this.regXX;
break;
case 0x5:
this.regEBP = (this.regEBP & ~this.maskData) | (((this.regECX << 16) >> 24) & this.maskData);
this.regECX = temp;
this.regECX = this.regXX;
break;
case 0x6:
this.regESI = (this.regESI & ~this.maskData) | (((this.regEDX << 16) >> 24) & this.maskData);
this.regEDX = temp;
this.regEDX = this.regXX;
break;
case 0x7:
this.regEDI = (this.regEDI & ~this.maskData) | (((this.regEBX << 16) >> 24) & this.maskData);
this.regEBX = temp;
this.regEBX = this.regXX;
break;
}
this.nStepCycles -= (this.regEA === X86.ADDR_INVALID? 3 : 6);
@ -1657,10 +1601,9 @@ X86.opMOVSXb = function()
*/
X86.opMOVSXw = function()
{
var bModRM = this.getIPByte();
this.setDataSize(2);
this.aOpModRegWord[bModRM].call(this, X86.fnMOVX);
switch((bModRM & 0x38) >> 3) {
this.decodeModRegWord.call(this, X86.fnMOVX);
switch((this.bModRM & 0x38) >> 3) {
case 0x0:
this.regEAX = ((this.regEAX << 16) >> 16);
break;