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Stack optimizations

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This commit is contained in:
Jeff Parsons 2015-02-01 12:48:04 -08:00 • committed by jeffpar
commit 13c50f7bd0
17 changed files with 3183 additions and 3129 deletions
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20
modules/pcjs/lib/x86seg.js
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@ -429,7 +429,7 @@ X86Seg.switchTSS = function switchTSS(selNew, fNest)
cpu.setShort(addrOld + X86.TSS.TASK_CX, cpu.regECX);
cpu.setShort(addrOld + X86.TSS.TASK_DX, cpu.regEDX);
cpu.setShort(addrOld + X86.TSS.TASK_BX, cpu.regEBX);
cpu.setShort(addrOld + X86.TSS.TASK_SP, cpu.regESP);
cpu.setShort(addrOld + X86.TSS.TASK_SP, cpu.getSP());
cpu.setShort(addrOld + X86.TSS.TASK_BP, cpu.regEBP);
cpu.setShort(addrOld + X86.TSS.TASK_SI, cpu.regESI);
cpu.setShort(addrOld + X86.TSS.TASK_DI, cpu.regEDI);
@ -455,8 +455,8 @@ X86Seg.switchTSS = function switchTSS(selNew, fNest)
offSP = (this.cpl << 2) + X86.TSS.CPL0_SP;
offSS = offSP + 2;
}
cpu.regESP = cpu.getShort(addrNew + offSP);
cpu.segSS.load(cpu.getShort(addrNew + offSS));
cpu.setSS(cpu.getShort(addrNew + offSS)); // TODO: Do we care that cpu.setSS() -- unlike segSS.load() -- will also set X86.OPFLAG.NOINTR?
cpu.setSP(cpu.getShort(addrNew + offSP));
cpu.segLDT.load(cpu.getShort(addrNew + X86.TSS.TASK_LDT));
if (fNest) cpu.setShort(addrNew + X86.TSS.PREV_TSS, selOld);
cpu.regMSW |= X86.MSW.TS;
@ -592,8 +592,8 @@ X86Seg.prototype.loadDesc8 = function(addrDesc, sel, fSuppress)
break;
}
regSP = cpu.popWord();
cpu.segSS.load(cpu.popWord());
cpu.regESP = regSP;
cpu.setSS(cpu.popWord()); // TODO: Do we care that cpu.setSS() -- unlike segSS.load() -- will also set X86.OPFLAG.NOINTR?
cpu.setSP(regSP);
this.fStackSwitch = true;
}
fGate = false;
@ -648,7 +648,7 @@ X86Seg.prototype.loadDesc8 = function(addrDesc, sel, fSuppress)
base = X86.ADDR_INVALID;
break;
}
regSP = cpu.regESP;
regSP = cpu.getSP();
var i = 0, nWords = (acc & 0x1f);
while (nWords--) {
this.awParms[i++] = cpu.getSOWord(cpu.segSS, regSP);
@ -657,10 +657,10 @@ X86Seg.prototype.loadDesc8 = function(addrDesc, sel, fSuppress)
addrTSS = cpu.segTSS.base;
offSP = (this.cpl << 2) + X86.TSS.CPL0_SP;
offSS = offSP + 2;
regSPPrev = cpu.regESP;
regSSPrev = cpu.segSS.sel;
cpu.regESP = cpu.getShort(addrTSS + offSP);
cpu.segSS.load(cpu.getShort(addrTSS + offSS));
regSSPrev = cpu.getSS();
regSPPrev = cpu.getSP();
cpu.setSS(cpu.getShort(addrTSS + offSS)); // TODO: Do we care that cpu.setSS() -- unlike segSS.load() -- will also set X86.OPFLAG.NOINTR?
cpu.setSP(cpu.getShort(addrTSS + offSP));
cpu.pushWord(regSSPrev);
cpu.pushWord(regSPPrev);
while (i) cpu.pushWord(this.awParms[--i]);