From 11ab7360e32aebf5dfc5a1331ebe44b0ceff6354 Mon Sep 17 00:00:00 2001
From: kitty <nepeta@canaglie.net>
Date: Mon, 16 Feb 2026 23:33:25 +1100
Subject: port some comparison n logic words from jf

---
 jefs.s | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

(limited to 'jefs.s')

diff --git a/jefs.s b/jefs.s
index 4c3f291..f5c2858 100644
--- a/jefs.s
+++ b/jefs.s
@@ -84,6 +84,7 @@ defword "bye", bye, 0
 	syscall
 	ret ; will not be reached
 
+; mem access {{{
 defword "@", fetch, 0
 	pspop r11
 	mov r12, qword [r11]
@@ -186,6 +187,7 @@ defword "cmove,", _cmove_comma, 0 ; ( c-addr u -- )
 	add r12, r9
 	mov qword [here], r12
 	ret
+; }}}
 
 ; note: this puts the _address it itself pushes_ on the stack
 ; maybe this is not the correct approach?
@@ -579,6 +581,7 @@ defword "syscall3", syscall3, 0 ; ( rdx rsi rdi id -- rax )
 	pspush rax
 	ret
 
+; stack {{{
 ; these stack wrangling words are dreadfully inefficient right now
 ; i will come back and make these less terrible later
 defword "dup", dup, 0
@@ -637,7 +640,9 @@ defword "2drop", twodrop, 0
 defword "rdrop", rdrop, 0
 	pop r11
 	ret
+; }}}
 
+; math {{{
 defword "+", plus, 0
 	pspop r11
 	pspop r12
@@ -668,6 +673,84 @@ defword "/mod", divmod, 0
 	pspush rax
 	ret
 
+defword "and", _and, 0
+	pspop r11
+	and [r14], r11
+	ret
+
+defword "or", _or, 0
+	pspop r11
+	or [r14], r11
+	ret
+
+defword "xor", _xor, 0
+	pspop r11
+	xor [r14], r11
+	ret
+
+defword "invert", invert, 0
+	not qword [r14]
+	ret
+; }}}
+
+; comparison {{{
+; the 'neg' converts the sete 0x1 into 0xffff (-1) which is this forth's
+; truth value
+defword "=", equals, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	sete r13b
+	movzx r11, r13b
+	neg r11
+	ret
+
+defword "<>", less_greater, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	setne r13b
+	movzx r11, r13b
+	neg r11
+	ret
+
+defword "<", less, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	setl r13b
+	movzx r11, r13b
+	neg r11
+	ret
+
+defword ">", greater, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	setg r13b
+	movzx r11, r13b
+	neg r11
+	ret
+
+defword "<=", lesseq, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	setle r13b
+	movzx r11, r13b
+	neg r11
+	ret
+
+defword ">=", greatereq, 0
+	pspop r11
+	pspop r12
+	cmp r11, r12
+	setge r13b
+	movzx r11, r13b
+	neg r11
+	ret
+; }}}
+
 defword "[", lbrac, immediate_mask
 	mov qword [state], interpreting
 	ret
-- 
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