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Isolated some PDP-11/20-specific behavior to that model

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Jeff Parsons 2016-11-21 09:42:20 -08:00 • committed by Jeff Parsons
commit f70f1f3d97
6 changed files with 276 additions and 298 deletions
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6
modules/pdp11/lib/cpuops.js
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@ -1883,11 +1883,7 @@ PDP11.opWAIT = function(opCode)
PDP11.opXOR = function(opCode)
{
var reg = (opCode >> PDP11.SRCMODE.SHIFT) & PDP11.OPREG.MASK;
/*
* As per the WARNING in readSrcWord(), we must supply a register number rather than a register value,
* which will then be evaluated by updateDstWord() after both the SRC and DST operands have been decoded.
*/
this.updateDstWord(opCode, -reg-1 /* this.regsGen[reg] */, PDP11.fnXOR);
this.updateDstWord(opCode, this.regsGen[reg + this.offRegSrc], PDP11.fnXOR);
this.nStepCycles -= (this.dstMode? (8 + 1) : (2 + 1) + (this.dstReg == 7? 2 : 0));
};