From 3fb3f443842c968bea98aece297cd50d730129b0 Mon Sep 17 00:00:00 2001
From: Jeff <Jeff@pcjs.org>
Date: Sun, 2 Apr 2017 11:43:54 -0700
Subject: [PATCH] Made a tiny 72-bit division optimization

---
 modules/pdp10/lib/cpuops.js        |  3 +-
 versions/pdpjs/1.34.3/pdp10-dbg.js | 56 +++++++++++++++---------------
 versions/pdpjs/1.34.3/pdp10.js     |  8 ++---
 3 files changed, 33 insertions(+), 34 deletions(-)

diff --git a/modules/pdp10/lib/cpuops.js b/modules/pdp10/lib/cpuops.js
index 946da2797..3ffdc4679 100644
--- a/modules/pdp10/lib/cpuops.js
+++ b/modules/pdp10/lib/cpuops.js
@@ -6253,8 +6253,7 @@ PDP10.doDIV = function(src, dst, ext)
         ext = (dst > PDP10.INT_MASK)? PDP10.WORD_MASK : 0;
     } else {
         var srcAbs = (src < PDP10.INT_LIMIT? src : PDP10.TWO_POW36 - src);
-        var dstAbs = (dst < PDP10.INT_LIMIT? dst : PDP10.TWO_POW36 - dst);
-        var extAbs = (ext < PDP10.INT_LIMIT? ext : PDP10.TWO_POW36 - ext - (dstAbs? 1 : 0));
+        var extAbs = (ext < PDP10.INT_LIMIT? ext : PDP10.TWO_POW36 - ext - (dst? 1 : 0));
         if (extAbs >= srcAbs) {
             this.regPS |= PDP10.PSFLAG.DCK | PDP10.PSFLAG.AROV;
             return -1;
diff --git a/versions/pdpjs/1.34.3/pdp10-dbg.js b/versions/pdpjs/1.34.3/pdp10-dbg.js
index ee397fc36..8d27a1829 100644
--- a/versions/pdpjs/1.34.3/pdp10-dbg.js
+++ b/versions/pdpjs/1.34.3/pdp10-dbg.js
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@@ -65,7 +65,7 @@ Function.prototype.bind||(Function.prototype.bind=function(a){function b(){retur
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 timer:2097152,speaker:16777216,computer:33554432,log:268435456,warn:536870912,buffer:1073741824,halt:-2147483648};
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 function tc(a,b,c,d){if(!yf(a))return!1;var e="";null===c&&(e=(c=!a.Ea||"tr"==a.Ea)?"tr":"t");a.F=0;b||td(a)&&ud(a,a.v.i,0);try{b=kd(a.v,b);var f=a.v.$a(b);0<f&&(uc(a.v,f),a.F+=f,vc(a.v,f,!0),wc(a.v,f),a.oa++)}catch(g){"number"!=typeof g&&(a.F=0,yb(a.v,g.stack||g.message))}!1!==d&&(a.na&&a.na.stop(),K(a.H,-1));cd(a,c||!1,e);return 0<a.F}m.Y=function(a){this.v&&this.v.Y(a)};function cd(a,b,c){b=void 0===b?!0:b;a.Ja&&(c&&a.u(zf+c),df(a.M,a.v.i),b&&1!=a.O?Af(a):Bf(a))}
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-break;default:a.u("unknown cs option");break a}void 0!==Mb&&bd(a.v);a.u("checksums "+(a.v.A.Va?"enabled":"disabled"));break;case "sp":void 0!==g[2]&&(gd(a.v,+g[2])||a.u("warning: using 1x multiplier, previous target not reached"));a.u("target speed: "+(a.v.ga.toFixed(2)+"Mhz")+" ("+a.v.ka+"x)");break;default:if(g[1]){a.u("unknown option: "+g[1]);break}case "?":a.u("debugger options:"),a.u("\tbase #\t\tset default base to #"),a.u("\tcs int #\tset checksum cycle interval to #"),a.u("\tcs start #\tset checksum cycle start count to #"),
+Od.Z[kb].l;Tf&&(kb=Tf);a.u(L(a,Sf,18)+" "+kb)}}}else{if("d"==ib){for(hb in bc)if(g[1]==hb){var Uf=a.wa[hb];Uf?(g.shift(),g.shift(),Uf(g)):a.u("no dump registered for "+qa);break a}qa||(ib=a.Oa||"dw")}else a.Oa=ib;if("dh"==ib){var Vf=qa,Wf=Ea,Xf="",Yf=0,la=a.W,ra=a.j;if(ra.length){var ea=+Vf||a.Da,Cb=+Wf||10;isNaN(ea)?ea=Cb:Xf="more ";ea>ra.length&&(a.u("note: only "+ra.length+" available"),ea=ra.length);la-=ea;0>la&&(null==ra[ra.length-1].B?(ea=la+ea,la=0):la+=ra.length);var Pd=[];"call"==Wf&&(Cb=
+1E5,Pd=["CALL"]);for(void 0!==Vf&&a.u(ea+" instructions earlier:");0<Cb&&la!=a.W;){var Zf=ra[la++];if(null==Zf.B)break;var Db=Z(Zf.B),Kh=ea--,$f=Df(a,Db,"history",Kh);(!Pd.length||0<=$f.indexOf(Pd[0]))&&a.u($f);Db.sb&&(la+=Db.sb,Cb-=Db.sb,ea-=Db.sb);la>=ra.length&&(la=0);a.Da=ea;Yf++;Cb--}}Yf||(a.u("no "+Xf+"history available"),a.Da=void 0)}else{var Na=0,ag="ds"==ib,Eb=hf(a,qa,a.pa);Ea&&("l"==Ea.charAt(0)?(Ea=Ea.substr(1)||Jh,Na=Qe(a,Ea)):Na=hf(a,Ea).B-Eb.B,0>Na&&(Na=0),65536<Na&&(Na=65536));var Lh=
+a.U;Eb.U&&(a.U=Eb.U);for(var bg="db"==ib?1:2,Qd=Na||32,Rd=1==bg?1:4,Mh=(Qd+Rd-1)/Rd|0||1,Oa="";Mh--&&0<Qd;){for(var sa="",Sd="",qa=L(a,Eb.B,18),cg=Rd;0<cg--&&0<Qd--;){var Td=a.Na(Eb,1);ag?(sa&&(sa+=","),sa+=Td):(sa+=lf(a,Td),sa+="  ");for(var Jc=29,Nh=0;1==bg&&0<=Jc;Nh++)var Fb=Td/Math.pow(2,Jc)%Math.pow(2,7),sa=sa+(L(a,Fb,7)+" "),Fb=Fb+0,Sd=Sd+(32>Fb?".":String.fromCharCode(Fb)),Jc=Jc-7}Oa&&(Oa+="\n");Oa=ag?Oa+(sa+","):Oa+(qa+": "+sa+(0>cg?" "+Sd:""))}Oa&&a.u(Oa);a.U=Lh}}}break;case "e":if("else"==
+g[0])break;var dg,eg,fg=g[0],Ud=g[1];"e"==fg||"ew"==fg?(dg=a.Na,eg=a.zb):Ud=null;if(null==Ud)a.u("edit memory commands:"),a.u("\tew [a] [...]  edit words at address a");else for(var Vd=hf(a,Ud,a.pa),Wd=2;Wd<g.length;Wd++){var Gb=Ve(a,g[Wd]);if(void 0===Gb)break;Gb=jf(Gb);a.u("changing "+L(a,Vd.B,18)+" from "+lf(a,dg.call(a,Vd))+" to "+lf(a,Gb));eg.call(a,Vd,Gb,1)}break;case "g":var gg=g[1],Oh=b;if(void 0!==gg){var hg=hf(a,gg);kf(a,hg,Oh);a.Ra(a.b,hg,!0)}xf(a,!0,c);break;case "h":a.A.P?(c||a.u("halting"),
+a.Y()):Nb(a,!0)||c||a.u("already halted");break;case "i":if("if"==g[0]){var Xd;var Hb=b.substr(2),Hb=Da(Hb);Ve(a,Hb)?(c||a.u("true: "+Hb),Xd=!0):(c||a.u("false: "+Hb),Xd=!1);Xd||(d=!1);break}f=!0;break;case "k":var Ph=g[0];if("?"==g[1])a.u("stack trace commands:"),a.u("\tk\tshow frame addresses"),a.u("\tks\tshow symbol information");else{var Yd=0,Zd=Z(),Ib=Z();for(a.u("stack trace for "+L(a,Ib.B,18));10>Yd;){for(var Pa=null,Qh=256;65536>Ib.B>>>0;){Zd.B=a.Na(Ib,2);if(null==Ib.B||!Qh--)break;if(!(Zd.B&
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+ua=null,N=g[1];"?"==N&&(N=void 0);if(void 0!==N){var Fa=0;if("all"==N)Fa=1879046143,N=null;else if("on"==N)ua=!0,N=null;else if("off"==N)ua=!1,N=null;else{"keys"==N&&(N="key");"kbd"==N&&(N="keyboard");for(ta in bc)if(N==ta){Fa=bc[ta];ua=!!(a.ca&Fa);break}if(!Fa){a.u("unknown message category: "+N);break a}}if(Fa)if("on"==g[2])a.ca|=Fa,ua=!0;else if("off"==g[2]&&(a.ca&=~Fa,ua=!1,1073741824==Fa)){for(var ng=1E3<=a.R.length?a.R.length-1E3:0;ng<a.R.length;)a.u(a.R[ng++]);a.R=[]}}var Sh=0,Kb="";for(ta in bc)if(!N||
+N==ta){var Th=!!(a.ca&bc[ta]);if(null===ua||ua==Th)Kb&&(Kb+=","),++Sh%10||(Kb+="\n\t"),"key"==ta&&(ta="keys"),Kb+=ta}void 0===N&&a.u("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.u((null!==ua?ua?"messages on:  ":"messages off: ":"message categories:\n\t")+(Kb||"none"));af(a)}break;case "p":if("print"==g[0]){yg(a,b.substr(5));break}var og=g[0],pg="p"==og?0:"pr"==og?1:-1;if("?"==g[1]||0>pg)a.u("step commands:"),a.u("\tp\tstep over instruction"),a.u("\tpr\tstep over instruction with register update");
+else if(a.O)a.u("step in progress");else{var qg=Z(a.v.i);a.Na(qg);a.O?(a.Ra(a.b,qg,!0),xf(a)||(a.H&&jd(a.H),a.O=0)):zg(a,pg?"tr":"t")}break;case "r":if("reset"==b){a.H&&a.H.reset();break}Af(a,g);break;case "s":a:switch(g[1]){case "base":if(g[2]){var lb=+g[2];if(2==lb||8==lb||10==lb||16==lb)a.U=lb;else{a.u("invalid base: "+lb);break}}a.u("default base: "+a.U);break;case "cs":var Lb;void 0!==g[3]&&(Lb=+g[3]);switch(g[2]){case "int":a.v.qa=Lb;break;case "start":a.v.Ia=Lb;break;case "stop":a.v.va=Lb;
+break;default:a.u("unknown cs option");break a}void 0!==Lb&&bd(a.v);a.u("checksums "+(a.v.A.Va?"enabled":"disabled"));break;case "sp":void 0!==g[2]&&(gd(a.v,+g[2])||a.u("warning: using 1x multiplier, previous target not reached"));a.u("target speed: "+(a.v.ga.toFixed(2)+"Mhz")+" ("+a.v.ka+"x)");break;default:if(g[1]){a.u("unknown option: "+g[1]);break}case "?":a.u("debugger options:"),a.u("\tbase #\t\tset default base to #"),a.u("\tcs int #\tset checksum cycle interval to #"),a.u("\tcs start #\tset checksum cycle start count to #"),
 a.u("\tcs stop #\tset checksum cycle stop count to #"),a.u("\tsp #\t\tset speed multiplier to #")}break;case "t":zg(a,g[0],g[1]);break;case "u":Bf(a,g[1],g[2],8);break;case "v":if("var"==g[0]){wg(a,b.substr(3))||(d=!1);break}if("ver"==g[0]){a.u((Rb||"PDP10")+" version 1.34.3 ("+a.v.nb+",RELEASE)");a.u(window?window.navigator.userAgent:"");break}f=!0;break;case "?":if(g[1]){yg(a,b.substr(1));break}var ae="commands:",be;for(be in Bg)ae+="\n"+Ca(be,9)+Bg[be];td(a)||(ae+="\nnote: history disabled if no exec breakpoints");
 a.u(ae);break;default:f=!0}f&&(a.u("unknown command: "+b),d=!1)}}catch(sg){a.u("Debugger "+(sg.stack||sg.message)),d=!1}return d}function ed(a,b,c){null!=b&&(a.Ha=Ke(a,b,c));for(;b=a.Ha.shift();)if(!Pf(a,b))return!1;return!0}
 var Bg={"?":"help/print","a [#]":"assemble","b [#]":"breakpoint",c:"clear output","d [#]":"dump memory","e [#]":"edit memory","g [#]":"go [to #]",h:"halt","if":"eval expression","int [#]":"request interrupt",k:"stack trace",ln:"list nearest symbol(s)",m:"messages",p:"step over",print:"print expression",r:"dump/set registers",reset:"reset machine",s:"set options","t [#]":"trace","u [#]":"unassemble","var":"assign variable",ver:"print version"},If=20,Jf=".WORD HLL HLLZ HLLO HLLE HRL HRLZ HRLO HRLE HRR HRRZ HRRO HRRE HLR HLRZ HLRO HLRE MOVE MOVS MOVN MOVM EXCH BLT PUSH POP LDB DPB IBP ILDB IDPB SETZ SETO SETA SETCA SETM SETCM AND ANDCA ANDCM ANDCB IOR ORCA ORCM ORCB XOR EQV LSH LSHC ROT ROTC ADD SUB MUL IMUL DIV IDIV ASH ASHC FSC FADR FSBR FMPR FDVR DFN UFA FAD FSB FMP FDV AOBJP AOBJN CAI CAM JUMP SKIP AOJ AOS SOJ SOS TR TL TD TS XCT JFFO JFCL JSR JSP JRST JSA JRA PUSHJ POPJ BLKI DATAI BLKO DATAO CONO CONI CONSZ CONSO UUO JOV JCRY0 JCRY1 JCRY JFOV HALT JRSTF JEN".split(" "),
@@ -246,7 +246,7 @@ function Eg(a){if(0<=a.W.indexOf("p"))return a.u(a.G.join("")),0;var b=Xe(a.b);t
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@@ -267,8 +267,8 @@ function Kg(a,b,c){a.S[a.X]=Ng(a,b);null!=c&&(a.ea[a.X]=c);a.X++}function Ng(a,b
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