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+
+
+: fm/mod ( d1 n1 -- n2 n3 )
+ dup >r
+ 2dup xor >r
+ >r
+ dabs r@ abs um/mod
+ swap r> ?negate swap
+ r> 0< if
+ negate
+ over if
+ r@ rot - swap 1-
+ then
+ then
+ r> drop
+;
+
+\ alternative solution
+\
+\ : FM/MOD \ ( d m -- r q ) signed floored division
+\ DUP >R SM/REM 2DUP 0< AND IF 1- SWAP R> + SWAP ELSE R> DROP THEN ;
+\ \ No newline at end of file