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--- manual:chapter5:asm [2019/12/03 15:50]
claudio [Flow control]
+++ manual:chapter5:asm [2021/09/29 05:58] (current)
jojo1973 [Simple assignments with operators]
@@ Line 5: / Line 5: @@
 In these cases a compact subset of instructions, with a different syntax and based on the manipulation of a small number of global registers, may achieve greater clarity; this subset of the language, given its compact format, is called **Assembly-like Instruction Set**.
-The Assembly-like Instruction Set is not meant as a separate programming language neither its feature are intended to be sandboxed in exclusive environments: its statements can be freely intermingled with **newRPL** commands and to suit anyone's programming style.
+The Assembly-like Instruction Set is not meant as a separate programming language neither its features are intended to be sandboxed in exclusive environments: its statements can be freely intermingled with **newRPL** commands to suit anyone's programming style.
 ==== Registers and pseudo-registers ====
@@ Line 37: / Line 37: @@
 |  :::  |  :::  | ''ASIN''  |  :::  |  :::  | ''MAX''  |
 |  :::  |  :::  | ''ACOS''  |  :::  |  :::  | ''RND''  |
-|  :::  |  :::  | ''ATAN'' |  :::  |  :::  |    |
+|  :::  |  :::  | ''ATAN'' |  :::  |  :::  | ''CLR''  |
-|  :::  |  :::  | ''SINH''  |  :::  |  :::  |  :::  |
+|  :::  |  :::  | ''SINH''  |  :::  |  :::  |   |
-|  :::  |  :::  | ''COSH''  |  :::  |  :::  |  :::  |
+|  :::  |  :::  | ''COSH''  |  :::  |  :::  |    |
 |  :::  |  :::  | ''TANH''  |  :::  |  :::  |  :::  |
 |  :::  |  :::  | ''ASINH''  |  :::  |  :::  |  :::  |
@@ Line 69: / Line 69: @@
 | '':A=B+#1'' | Add ''1'' to the value of register ''B'' and assign the result to register ''A''  |
-| '':E=R { 1 2 3 }''  | Assign the list ''{ 1 2 3 }'' to register ''E''  |
+| '':E=R { 1 2 3 }''  | Store the list ''{ 1 2 3 }'' in register ''E''  |
 | '':P=A''  | Push the value of register ''A'' to the stack  |
 | '':A=S2'' '':S2=S1'' '':S1=A''  | Swap stack level 1 with level 2 using register ''A'' as temporary storage. An error is raised if the stack contains less than 2 levels  |
 | '':C+=B^#2''  | Square the value register ''B'' and adds the result to register ''C''  |
+| '':B=R^#2 π''  | Assign ''%%'%%π^2%%'%%'' to register B. This example shows that register ''R'' must not necessarily be the second argument of a binary operator  |
 ==== Assignment with math functions ====
@@ Line 99: / Line 100: @@
 | ''AL''    | Always                 | ---       | ---       |
 | ''LT''    | Less Than              | ---       | Set       |
-| ''EQ''    | Equals                 | Set       | ---       |
+| ''EQ'' or ''Z''  | Equals                 | Set       | ---       |
 | ''LE''    | Less Than or Equals    | ---       | Set       |
 | :::       | :::                    | Set       | ---       |
 | ''NA''    | Never                  | ---       | ---       |
 | ''GE''    | Greater Than or Equals | ---       | Clear     |
-| ''NE''    | Not Equals             | Clear     | ---       |
+| ''NE'' or ''NZ''  | Not Equals             | Clear     | ---       |
 | ''GT''    | Greater Than           | Clear     | Clear     |
@@ Line 133: / Line 134: @@
 | '':PUSH.A.#3'' | Reverse of '':POP''. In this example will do '':P=C'', '':P=B'' and '':P=A''  |
 | '':RPUSH.A.#3''  | Reverse of '':RPOP''. In this example will do '':P=A'', '':P=B'', and '':P=C''  |
+| '':CLR.A.#3'' | Set registers to zero (clear) starting with ''A'', and as many registers as requested. In this example will do '':A=0'', '':B=0'' and '':C=0''  |
 ==== Example code ====
@@ Line 146: / Line 148: @@
   -103 SF             @ Complex results
   :A=RPOP.S1.#3       @ Store coefficients in registers
-  :CMP.A.#0 :FPUSH.EQ @ a=0? Push test on the stack
+  :AND.A.C            @ Are either zero?
-  :CMP.C.#0 :FPUSH.EQ @ c=0? Push test on the stack
+  :SKIP.NZ            @ Skip next seco if both A and C were non-zero
-  OR                  @ Are either zero?
-  :CMP.S1.#1 DROP     @ Turn newRPL boolean into flags and discard it
-  :SKIP.NE            @ Skip next seco if false
   :: "Zero Input Invalid"
      DOERR            @ Abort with error
   ;
-  :P=#0-B             @ Push -B on stack
+  :D=#0-B             @ -B
-  DUP SQ              @ -B, B^2
+  :E=B*B              @ B^2
- :S1*=A :S1*=C     @ -B, B^2, 4*A*C
+  :F=#4*A :F*=C       @ 4*A*C
-  - √                 @ -B, √(B^2-4*A*C)
+  :E-=F   :E=SQRT.E   @ √(B^2-4*A*C)
-  :P=B SIGN * -       @ -B-SIGN(B)*√(B^2-4*A*C)
-/ :S1/=A          @ (-B-SIGN(B)*√(B^2-4*A*C))/2/A is R1, the largest root in absolute value
+  :CMP.B.#0
-  :P=C :S1/=A         @ R1, C/A
+  :SKIP.GE :F=D+E     @ -B+√(B^2-4*A*C) when B<=0
+  :SKIP.LT :F=D-E     @ -B-√(B^2-4*A*C) when B>0
+  :E=A*#2             @ 2*A
+  :P=F/E              @ (-B-SIGN(B)*√(B^2-4*A*C))/2/A is R1, the largest root in absolute value
+  :P=C/A              @ R1, C/A
   :S1/=S2             @ C/(R1*A) is R2, the other root
 »
@@ Line 183: / Line 187: @@
     :F*=A         @ F='(y2-y1)*(X-x1)'
     :B-=F         @ B='(Y-y1)*(x2-x1)-(y2-y1)*(X-x1)'
-    :PUSH.B.#1    @ Push result on the stack
+    :P=B          @ Push result on the stack
   »
 »
 </code>