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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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7
modules/pcjs/lib/x86help.js
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@ -427,7 +427,7 @@ var X86Help = {
this.regEBX = dst;
break;
case 0x4: // SP
this.regESP = dst;
this.setSP(dst);
break;
case 0x5: // BP
this.regEBP = dst;
@ -508,9 +508,10 @@ var X86Help = {
opHelpRETF: function(n) {
var regEIP = this.popWord();
var regCS = this.popWord();
if (n) this.regESP = (this.regESP + n) & 0xffff;
n <<= (this.dataSize >> 2);
if (n) this.setSP(this.getSP() + n); // TODO: optimize
if (this.setCSIP(regEIP, regCS, false)) {
if (n) this.regESP = (this.regESP + n) & 0xffff;
if (n) this.setSP(this.getSP() + n); // TODO: optimize
/*
* As per Intel documentation: "If any of [the DS or ES] registers refer to segments whose DPL is
* less than the new CPL (excluding conforming code segments), the segment register is loaded with