X-Git-Url: https://git.rrq.au/?a=blobdiff_plain;f=logic.asm;h=26963322797442ab1ddbb5a0afd485401b247301;hb=a3427c86d68cc40ac6f9ed1bd153bb45f0456b55;hp=a3b183dc097d4edffd9d25233cff77310e4a6245;hpb=02ef6e814ef0e6c61348c70bd310ba1f0df2506b;p=rrq%2Frrqforth.git

diff --git a/logic.asm b/logic.asm
index a3b183d..2696332 100644
--- a/logic.asm
+++ b/logic.asm
@@ -39,6 +39,14 @@
 	push qword -1
 	next
 
+pop_false_next:
+	mov qword [rsp],0
+	next
+
+pop_true_next:
+	mov qword [rsp],-1
+	next
+
 	WORD p_within, 'WITHIN',fasm
 	;; ( n1 n2 n3 -- flag )
 	;; Push true if n2 <= n1 and n1 < n3 and false otherwise.
@@ -56,57 +64,64 @@ p_within_not:
 	WORD p_0less, '0<',fasm
 	;; ( n -- flag )
 	;; flag is true (non-zero) if and only if n is less than zero.
-	xor rax,rax
-	cmp qword [rsp],0
-	jge p_0less.lt
-	not rax
-p_0less.lt:
-	next
+	pop rax
+	cmp rax,qword [rsp]
+	jl pop_true_next
+	jmp pop_false_next
 
 	WORD p_0equal, '0=',fasm
 	;; ( x -- flag )
 	;; flag is true if x is equal to zero otherwise false.
-	xor rax,rax
 	cmp qword [rsp],0
-	jne p_0equal.ne
-	not rax
-p_0equal.ne:
-	next
+	je pop_true_next
+	jmp pop_false_next
 	
 	WORD p_lessthan, '<',fasm
 	;; ( n1 n2 -- flag )
 	;; flag is true if and only if n1 is less than n2.
-	xor rax,rax
-	pop rbx
-	cmp qword [rsp], rbx
-	jge p_lessthan.ge
-	not rax
-p_lessthan.ge:
-	mov qword [rsp], rax
-	next
+	pop rax
+	cmp rax,qword [rsp]
+	jl pop_true_next
+	jmp pop_false_next
+
+	WORD p_lessequal, '<=',fasm
+	;; ( n1 n2 -- flag )
+	;; flag is true if and only if n1 is less than n2.
+	pop rax
+	cmp rax,qword [rsp]
+	jle pop_true_next
+	jmp pop_false_next
 
 	WORD p_equal, '=',fasm
 	;; ( x1 x2 -- flag )
 	;; flag is true if and only if x1 is bit-for-bit the same as
 	;; x2.
-	xor rax,rax
-	pop rbx
-	cmp qword [rsp], rbx
-	jne p_equal.ne
-	not rax
-p_equal.ne:
-	mov qword [rsp], rax
-	next
+	pop rax
+	cmp rax,qword [rsp]
+	je pop_true_next
+	jmp pop_false_next
 
+	WORD p_unequal, '!=',fasm
+	;; ( x1 x2 -- flag )
+	;; flag is true if and only if x1 is bit-for-bit the same as
+	;; x2.
+	pop rax
+	cmp qword [rsp], rax
+	jne pop_true_next
+	jmp pop_false_next
+	
 	WORD p_greaterthan, '>',fasm
 	;; ( n1 n2 -- flag )
 	;; flag is true if and only if n1 is greater than n2.
-	xor rax,rax
-	pop rbx
-	cmp qword [rsp], rbx
-	jle p_greaterthan.le
-	not rax
-p_greaterthan.le:
-	mov qword [rsp], rax
-	next
+	pop rax
+	cmp rax,qword [rsp]
+	jg pop_true_next
+	jmp pop_false_next
 
+	WORD p_greaterequal, '>=',fasm
+	;; ( n1 n2 -- flag )
+	;; flag is true if and only if n1 is greater than n2.
+	pop rax
+	cmp rax,qword [rsp]
+	jge pop_true_next
+	jmp pop_false_next