Added "lsh" and "rot" commands to the Int36 command-line tool to mimic the PDP-10 opcodes and test their logic

modules/pdp10/lib/cpuops.js

@@ -1402,7 +1402,7 @@ PDP10.opASH = function(op, acc)
     /*
      * Convert the unsigned 18-bit value in regEA to a signed 8-bit value (+/-255).
      */
-    var s = (this.regEA << 14) >> 24;
+    var s = ((this.regEA << 14) >> 14) % 256;
     if (s) {
         var w = this.readWord(acc), bitsShifted;
         /*
@@ -1474,7 +1474,7 @@ PDP10.opROT = function(op, acc)
     /*
      * Convert the unsigned 18-bit value in regEA to a signed 8-bit value, modulo 36 (+/-35).
      */
-    var s = ((this.regEA << 14) >> 24) % 36;
+    var s = ((this.regEA << 14) >> 14) % 36;
     if (s) {
         var w = this.readWord(acc);
         /*
@@ -1523,7 +1523,7 @@ PDP10.opLSH = function(op, acc)
     /*
      * Convert the unsigned 18-bit value in regEA to a signed 8-bit value (+/-255).
      */
-    var s = (this.regEA << 14) >> 24;
+    var s = ((this.regEA << 14) >> 14) % 256;
     if (s) {
         var w = this.readWord(acc);
         if (s > 0) {
@@ -1598,7 +1598,7 @@ PDP10.opROTC = function(op, acc)
     /*
      * Convert the unsigned 18-bit value in regEA to a signed 8-bit value, modulo 72 (+/-71).
      */
-    var s = ((this.regEA << 14) >> 24) % 72;
+    var s = ((this.regEA << 14) >> 14) % 72;
     if (s) {
         var wLeft = this.readWord(acc);
         var wRight = this.readWord((acc + 1) & 0o17);
@@ -1638,7 +1638,7 @@ PDP10.opLSHC = function(op, acc)
     /*
      * Convert the unsigned 18-bit value in regEA to a signed 8-bit value (+/-255).
      */
-    var s = (this.regEA << 14) >> 24;
+    var s = ((this.regEA << 14) >> 14) % 256;
     if (s) {
         var wLeft = this.readWord(acc);
         var wRight = this.readWord((acc + 1) & 0o17);

modules/pdp10/lib/defines.js

@@ -84,7 +84,7 @@ var PDP10 = {
     MODEL_KA10: 1001,
 
     /*
-     * This constant is used to mark points in the code where the physical address being returned
+     * ADDR_INVALID is used to mark points in the code where the physical address being returned
      * is invalid and should not be used.
      *
      * In a 32-bit CPU, -1 (ie, 0xffffffff) could actually be a valid address, so consider changing

modules/shared/bin/int36

@@ -71,10 +71,21 @@ function test(sCmd, fREPL)
     if (sNum2 != null) console.log(sOp + " " + dumpInt36(i36Op));
 
     switch(sOp) {
+    case "get":
+        break;
+
     case "set":
         i36Reg = new Int36(i36Op);
         break;
 
+    case "ext":
+        i36Reg.extend(i36Op);
+        break;
+
+    case "red":
+        i36Reg.reduce(i36Op);
+        break;
+
     case "add":
         i36Reg.add(i36Op);
         break;
@@ -91,6 +102,18 @@ function test(sCmd, fREPL)
         i36Reg.div(i36Op);
         break;
 
+    case "ash":
+        i36Reg.ash(i36Op);
+        break;
+
+    case "lsh":
+        i36Reg.lsh(i36Op);
+        break;
+
+    case "rot":
+        i36Reg.rot(i36Op);
+        break;
+
     default:
         console.log("unrecognized command: " + sCmd);
         return false;
@@ -151,6 +174,12 @@ test("set 0o577777777777 0o777777777777");
 test("set 0o677777777777 0o777777777777");
 test("set 0o777777777777 0o777777777777");
 
+test("set 0o112233445566");
+test("lsh 3");
+test("lsh -3");
+test("rot 6");
+test("rot -6");
+
 repl.start({
     prompt: "int36> ",
     input: process.stdin,

modules/shared/lib/int36.js

@@ -500,6 +500,8 @@ class Int36 {
         var fNeg = false, extended;
         var n1 = this.value, n2 = value;
 
+        this.error = Int36.ERROR.NONE;
+
         if (n1 > Int36.MAXPOS) {
             n1 = Int36.BIT36 - n1;
             fNeg = !fNeg;
@@ -573,6 +575,8 @@ class Int36 {
      */
     divExtended(divisor)
     {
+        this.error = Int36.ERROR.NONE;
+
         if (!divisor) {
             this.error |= Int36.ERROR.DIVZERO;
             return;
@@ -649,6 +653,236 @@ class Int36 {
         }
     }
 
+    /**
+     * ash(i36)
+     *
+     * @this {Int36}
+     * @param {Int36} i36 (18-bit value representing the number of bits to arithmetically shift left (> 0) or right (< 0))
+     */
+    ash(i36)
+    {
+        this.ashNum(i36.value);
+    }
+
+    /**
+     * ashNum(num)
+     *
+     * @this {Int36}
+     * @param {number} num (18-bit value representing the number of bits to arithmetically shift left (> 0) or right (< 0))
+     */
+    ashNum(num)
+    {
+        num = Int36.validate(num);
+        this.error = Int36.ERROR.NONE;
+        /*
+         * Convert the unsigned 18-bit value in regEA to a signed 8-bit value (+/-255).
+         */
+        var s = ((num << 14) >> 14) % 256;
+        if (s) {
+            if (this.extended == null) {
+                /*
+                 * Simulate opASH()
+                 */
+                var w = this.value, bitsShifted;
+                /*
+                 * Convert the unsigned word (w) to a signed value (i), for convenience.
+                 */
+                var i = w > Int36.MAXPOS? -(Int36.BIT36 - w) : w;
+                if (s > 0) {
+                    if (s >= 35) {
+                        i = (i < 0? Int36.BIT35 : 0);
+                        bitsShifted = Int36.MAXPOS;
+                    } else {
+                        i = (i * Math.pow(2, s)) % Int36.BIT35;
+                        /*
+                         * bitsShifted must be set to the mask of all magnitude bits shifted out of
+                         * the original word.  Using 8-bit signed words as an example, this table shows
+                         * the bitsShifted values that would correspond to shifting 1-7 bits left:
+                         *
+                         *    shifts    bitsShifted     value       calculation
+                         *    ------    -----------     ------      -----------
+                         *      1       0b01000000      128-64      128-Math.pow(2, 7-1)
+                         *      2       0b01100000      128-32      128-Math.pow(2, 7-2)
+                         *      3       0b01110000      128-16      128-Math.pow(2, 7-3)
+                         *     ...
+                         *      7       0b01111111      128-1       128-Math.pow(2, 7-7)
+                         */
+                        bitsShifted = Int36.BIT35 - Math.pow(2, 35 - s);
+                    }
+                    if (w <= Int36.MAXPOS) {
+                        /*
+                         * Since w was positive, overflow occurs ONLY if any of the bits we shifted out were 1s.
+                         * If all those bits in the original value (w) were 0s, then adding bitsShifted to it could NOT
+                         * produce a value > MAX_POS36.
+                         */
+                        if (w + bitsShifted > Int36.MAXPOS) this.error |= Int36.ERROR.OVERFLOW;
+                    } else {
+                        /*
+                         * Since w was negative, overflow occurs ONLY if any of the bits we shifted out were 0s.
+                         * If all those bits in the original value (w) were 1s, subtracting bitsShifted from it could NOT
+                         * produce a value <= MAX_POS36.
+                         */
+                        if (w - bitsShifted <= Int36.MAXPOS) this.error |= Int36.ERROR.OVERFLOW;
+                    }
+                } else {
+                    if (s <= -35) {
+                        i = (i < 0? -1 : 0);
+                    } else {
+                        i = Math.trunc(i / Math.pow(2, -s));
+                    }
+                }
+                w = (i < 0? i + Int36.BIT36 : i);
+                this.value = w;
+            }
+            else {
+                /*
+                 * Simulate opASHC()
+                 */
+                console.log("ASHC unimplemented");
+            }
+        }
+    }
+
+    /**
+     * lsh(i36)
+     *
+     * @this {Int36}
+     * @param {Int36} i36 (18-bit value representing the number of bits to logically shift left (> 0) or right (< 0))
+     */
+    lsh(i36)
+    {
+        this.lshNum(i36.value);
+    }
+
+    /**
+     * lshNum(num)
+     *
+     * @this {Int36}
+     * @param {number} num (18-bit value representing the number of bits to logically shift left (> 0) or right (< 0))
+     */
+    lshNum(num)
+    {
+        num = Int36.validate(num);
+        this.error = Int36.ERROR.NONE;
+        /*
+         * Convert the unsigned 18-bit value in regEA to a signed 8-bit value (+/-255).
+         */
+        var s = ((num << 14) >> 14) % 256;
+        if (s) {
+            if (this.extended == null) {
+                var w = this.value;
+                if (s > 0) {
+                    if (s >= 36) {
+                        w = 0;
+                    } else {
+                        w = (w * Math.pow(2, s)) % Int36.BIT36;
+                    }
+                } else {
+                    if (s <= -36) {
+                        w = 0;
+                    } else {
+                        w = Math.trunc(w / Math.pow(2, -s));
+                    }
+                }
+                this.value = w;
+            } else {
+                var wRight = this.value;
+                var wLeft = this.extended;
+                if (s > 0) {
+                    if (s >= 36) {
+                        wRight = 0;
+                        if (s >= 72) {
+                            wLeft = 0;
+                        } else {
+                            wLeft = (wRight * Math.pow(2, s - 36)) % Int36.BIT36;
+                        }
+                    } else {
+                        wLeft = ((wLeft * Math.pow(2, s)) % Int36.BIT36) + Math.trunc(wRight / Math.pow(2, 36 - s));
+                        wRight = (wRight * Math.pow(2, s)) % Int36.BIT36;
+                    }
+                } else {
+                    if (s <= -36) {
+                        wLeft = 0;
+                        if (s <= -72) {
+                            wRight = 0;
+                        } else {
+                            wRight = Math.trunc(wLeft / Math.pow(2, -s - 36));
+                        }
+                    } else {
+                        wRight = Math.trunc(wRight / Math.pow(2, -s)) + ((wLeft * Math.pow(2, 36 + s)) % Int36.BIT36);
+                        wLeft = Math.trunc(wLeft / Math.pow(2, -s));
+                    }
+                }
+                this.value = wRight;
+                this.extended = wLeft;
+            }
+        }
+    }
+
+    /**
+     * rot(i36)
+     *
+     * @this {Int36}
+     * @param {Int36} i36 (18-bit value representing the number of bits to logically rotate left (> 0) or right (< 0))
+     */
+    rot(i36)
+    {
+        this.rotNum(i36.value);
+    }
+
+    /**
+     * rotNum(num)
+     *
+     * @this {Int36}
+     * @param {number} num (18-bit value representing the number of bits to logically rotate left (> 0) or right (< 0))
+     */
+    rotNum(num)
+    {
+        var s;
+        num = Int36.validate(num);
+        this.error = Int36.ERROR.NONE;
+
+        if (this.extended == null) {
+            /*
+             * Convert the unsigned 18-bit value in regEA to a signed 8-bit value, modulo 36 (+/-35).
+             */
+            s = ((num << 14) >> 14) % 36;
+            if (s) {
+                var w = this.value;
+                /*
+                 * Note that a right rotation (s < 0) of s bits is equivalent to a left rotation (s > 0) of 36 + s bits.
+                 */
+                if (s < 0) s = 36 + s;
+                w = ((w * Math.pow(2, s)) % Int36.BIT36) + Math.trunc(w / Math.pow(2, 36 - s));
+                this.value = w;
+            }
+        }
+        else {
+            /*
+             * Convert the unsigned 18-bit value in regEA to a signed 8-bit value, modulo 72 (+/-71).
+             */
+            s = ((num << 14) >> 14) % 72;
+            if (s) {
+                var wRight = this.value;
+                var wLeft = this.extended;
+                var wLeftOrig = wLeft;
+                /*
+                 * Note that a right rotation (s < 0) of s bits is equivalent to a left rotation (s > 0) of 72 + s bits.
+                 */
+                if (s < 0) s = 72 + s;
+                if (s < 36) {
+                    wLeft = ((wLeft * Math.pow(2, s)) % Int36.BIT36) + Math.trunc(wRight / Math.pow(2, 36 - s));
+                    wRight = ((wRight * Math.pow(2, s)) % Int36.BIT36) + Math.trunc(wLeftOrig / Math.pow(2, 36 - s));
+                } else {
+                    wLeft = ((wRight * Math.pow(2, s - 36)) % Int36.BIT36) + Math.trunc(wLeft / Math.pow(2, 72 - s));
+                    wRight = ((wLeftOrig * Math.pow(2, s - 36)) % Int36.BIT36) + Math.trunc(wRight / Math.pow(2, 72 - s));
+                }
+                this.value = wRight;
+                this.extended = wLeft;
+            }
+        }
+    }
+
     /**
      * extend()
      *
@@ -734,7 +968,6 @@ class Int36 {
         if (this.value) {
             this.value = Int36.BIT36 - this.value;
         }
-        this.error = Int36.ERROR.NONE;
     }
 
     /**
@@ -865,14 +1098,15 @@ class Int36 {
     }
 
     /**
-     * validate(num)
+     * validate(num, bits)
      *
      * This ensures that any incoming (external) 36-bit values conform to our internal requirements.
      *
      * @param {number} num
+     * @param {number} [bits] (an alternative number of bits to restrict the value to)
      * @return {number}
      */
-    static validate(num)
+    static validate(num, bits = 36)
     {
         /*
          * Although it's expected that most callers will supply unsigned 36-bit values, we're nice about
@@ -882,7 +1116,7 @@ class Int36 {
         if (num < 0 && num >= Int36.MINNEG) {
             num += Int36.BIT36;
         }
-        var value = Math.trunc(Math.abs(num)) % Int36.BIT36;
+        var value = Math.trunc(Math.abs(num)) % Math.pow(2, bits);
         if (DEBUG && num !== value) {
             console.log("Int36.validate(" + num + " out of range, truncated to " + value + ")");
         }

versions/pdpjs/1.34.2/pdp10-dbg.js

@@ -109,10 +109,10 @@ var Sd=[Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,Q,
 function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},
 function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},Wd,Xd,Yd,function(a,b){b&&this.j(b,this.g(this.f))},function(a,b){a=this.g(this.f);a=(a/G|0)+a%G*G;this.j(b,a)},function(a,b){this.j(b,this.f*G)},function(a,b){a=this.g(b);a=(a/G|0)+a%G*G;this.j(this.f,a)},function(a,b){a=this.g(this.f);a=(a/G|0)+a%G*G;this.j(this.f,a);b&&this.j(b,a)},function(a,b){this.j(b,Pd(this,this.g(this.f)))},function(a,b){this.j(b,this.f?Xb-this.f:0)},function(a,b){this.j(this.f,Pd(this,
 this.g(b)))},function(a,b){a=Pd(this,this.g(this.f));this.j(this.f,a);b&&this.j(b,a)},function(a,b){this.j(b,this.abs(this.g(this.f)))},function(a,b){this.j(b,this.f)},function(a,b){this.j(this.f,this.abs(this.g(b)))},function(a,b){a=this.abs(this.g(this.f));this.j(this.f,a);b&&this.j(b,a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},
-function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a,b){var c=this.f<<14>>24;if(c){a=this.g(b);var d=a>Vb?-(E-a):a;0<c?(35<=c?(d=0>d?Sb:0,c=Tb):(d=d*Math.pow(2,c)%Sb,c=Sb-Math.pow(2,35-c)),a<=Vb?a+c>Vb&&(this.w|=131072):a-c<=Vb&&(this.w|=131072)):d=-35>=c?0>d?-1:0:Math.trunc(d/Math.pow(2,-c));a=0>d?d+E:d;this.j(b,a)}},function(a,b){if(a=(this.f<<14>>24)%36){var c=this.g(b);0>a&&(a=36+a);c=c*Math.pow(2,
+function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a){this.b(a)},function(a,b){var c=(this.f<<14>>14)%256;if(c){a=this.g(b);var d=a>Vb?-(E-a):a;0<c?(35<=c?(d=0>d?Sb:0,c=Tb):(d=d*Math.pow(2,c)%Sb,c=Sb-Math.pow(2,35-c)),a<=Vb?a+c>Vb&&(this.w|=131072):a-c<=Vb&&(this.w|=131072)):d=-35>=c?0>d?-1:0:Math.trunc(d/Math.pow(2,-c));a=0>d?d+E:d;this.j(b,a)}},function(a,b){if(a=(this.f<<14>>14)%36){var c=this.g(b);0>a&&(a=36+a);c=c*Math.pow(2,
-a)%E+Math.trunc(c/Math.pow(2,36-a));this.j(b,c)}},function(a,b){if(a=this.f<<14>>24){var c=this.g(b),c=0<a?36<=a?0:c*Math.pow(2,a)%E:-36>=a?0:Math.trunc(c/Math.pow(2,-a));this.j(b,c)}},function(a){this.b(a)},function(a){this.b(a)},function(a,b){if(a=(this.f<<14>>24)%72){var c=this.g(b),d=this.g(b+1&15),e=c;0>a&&(a=72+a);36>a?(c=c*Math.pow(2,a)%E+Math.trunc(d/Math.pow(2,36-a)),d=d*Math.pow(2,a)%E+Math.trunc(e/Math.pow(2,36-a))):(c=d*Math.pow(2,a-36)%E+Math.trunc(c/Math.pow(2,72-a)),d=e*Math.pow(2,
+a)%E+Math.trunc(c/Math.pow(2,36-a));this.j(b,c)}},function(a,b){if(a=(this.f<<14>>14)%256){var c=this.g(b),c=0<a?36<=a?0:c*Math.pow(2,a)%E:-36>=a?0:Math.trunc(c/Math.pow(2,-a));this.j(b,c)}},function(a){this.b(a)},function(a){this.b(a)},function(a,b){if(a=(this.f<<14>>14)%72){var c=this.g(b),d=this.g(b+1&15),e=c;0>a&&(a=72+a);36>a?(c=c*Math.pow(2,a)%E+Math.trunc(d/Math.pow(2,36-a)),d=d*Math.pow(2,a)%E+Math.trunc(e/Math.pow(2,36-a))):(c=d*Math.pow(2,a-36)%E+Math.trunc(c/Math.pow(2,72-a)),d=e*Math.pow(2,
-a-36)%E+Math.trunc(d/Math.pow(2,72-a)));this.j(b,c);this.j(b+1&15,d)}},function(a,b){if(a=this.f<<14>>24){var c=this.g(b),d=this.g(b+1&15);0<a?36<=a?(d=0,c=72<=a?0:d*Math.pow(2,a-36)%E):(c=c*Math.pow(2,a)%E+Math.trunc(d/Math.pow(2,36-a)),d=d*Math.pow(2,a)%E):-36>=a?(c=0,d=-72>=a?0:Math.trunc(c/Math.pow(2,-a-36))):(d=Math.trunc(d/Math.pow(2,-a))+c*Math.pow(2,36+a)%E,c=Math.trunc(c/Math.pow(2,-a)));this.j(b,c);this.j(b+1&15,d)}},O,function(a,b){a=this.g(b);this.j(b,this.g(this.f));this.j(this.f,a)},
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+f.length;rc++){var Bd=V(a,f[rc]);if(void 0===Bd){a.i("unknown value: "+f[rc]);break}a.i("changing "+N(a,qc.B)+" from "+We(Af.call(a,qc))+" to "+We(Bd));Bf.call(a,qc,Bd,1)}}break;case "g":a:{var Df=f[1],Ug=b;if(void 0!==Df){var Cd=Z(a,Df);if(!Cd)break a;Ve(a,Cd,Ug);a.Da(a.b,Cd,!0)}Pf(a,!0,c)}break;case "h":a.v.K?(c||a.i("halting"),a.V()):Lb(a,!0)||c||a.i("already halted");break;case "i":if("if"==f[0]){var Dd;var rb=b.substr(2),rb=Ia(rb);V(a,rb)?(c||a.i("true: "+rb),Dd=!0):(c||a.i("false: "+rb),Dd=
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