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authorDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
committerDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
commit67d25d837ac55f28a366c0a3b262e439a6e75fc3 (patch)
treedf7715c7724c5935ab87c807f3b8b4ef529315e3 /amforth-6.5/msp430/words/do-plusloop.asm
parente0d6784e89dba33226c0edb815bb974486fa7c48 (diff)
Add AmForth
Diffstat (limited to 'amforth-6.5/msp430/words/do-plusloop.asm')
-rw-r--r--amforth-6.5/msp430/words/do-plusloop.asm20
1 files changed, 20 insertions, 0 deletions
diff --git a/amforth-6.5/msp430/words/do-plusloop.asm b/amforth-6.5/msp430/words/do-plusloop.asm
new file mode 100644
index 0000000..ae41980
--- /dev/null
+++ b/amforth-6.5/msp430/words/do-plusloop.asm
@@ -0,0 +1,20 @@
+;Z (+loop) n -- R: sys1 sys2 -- | sys1 sys2
+;Z run-time code for +LOOP
+; Add n to the loop index. If loop terminates, clean up the
+; return stack and skip the branch. Else take the inline branch.
+; ; CODEHEADER(xplusloop,7,"(+loop)")
+; DW link
+; DB 0FFh ; not immediate
+;.set link = $
+; DB 7,"(+loop)"
+; .align 16
+XT_DOPLUSLOOP:
+ DW $+2
+ ADD TOS,INDEX
+ MOV @PSP+,TOS ; get new TOS, doesn't change flags
+ BIT #100h,SR ; is overflow bit set?
+ JZ dobran ; no overflow = loop
+ ADD #2,IP ; overflow = loop done, skip branch ofs
+ MOV @RSP+,INDEX ; restore old loop values
+ MOV @RSP+,LIMIT
+ NEXT