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ed2b91411a
I'm planning on going back to 8-bit branching. 16-bit br cells incur a non-negligible penalty and, while at first 64 words (128 bytes forward or backward) seemed a bit limiting, I now don't see why one would ever construct such a big branch. It would be un-forthy. Also, I looked at using BC instead of IY to hold IP and the transition would be a lot easier with 8-bit branching. In this commit, all I do is add overflow checks in IF. The mechanic below doesn't change. I'll give myself some time to think it over so that I avoid yet another back and forth.
10 lines
276 B
Plaintext
10 lines
276 B
Plaintext
: BEGIN H@ ; IMMEDIATE
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: AGAIN COMPILE (br) H@ - _bchk , ; IMMEDIATE
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: UNTIL COMPILE (?br) H@ - _bchk , ; IMMEDIATE
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: [ INTERPRET ; IMMEDIATE
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: ] R> DROP ;
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: LIT< WORD 34 , SCPY 0 C, ; IMMEDIATE
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: LITA 36 , , ;
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: COMPILE ' LITA ['] , , ; IMMEDIATE
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: [COMPILE] ' , ; IMMEDIATE
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