62 lines
1.3 KiB
Plaintext
62 lines
1.3 KiB
Plaintext
#
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;
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; (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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; See the copyright notice in the ACK home directory, in the file "Copyright".
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;
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;
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; Module: Compute non-constant set displays
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; Author: Ceriel J.H. Jacobs
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; Version: $Header$
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;
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mes 2,EM_WSIZE,EM_PSIZE
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; _LtoUset is called for set displays containing { expr1 .. expr2 }.
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; It has six parameters, of which the caller must pop five:
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; - The set in which bits must be set.
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; - the lower bound of the set type.
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; - The set size in bytes.
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; - The upper bound of set elements, specified by the set-type.
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; - "expr2", the upper bound
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; - "expr1", the lower bound
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#define SETBASE 5*EM_WSIZE
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#define SETLOW 4*EM_WSIZE
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#define SETSIZE 3*EM_WSIZE
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#define USETSIZ 2*EM_WSIZE
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#define LWB EM_WSIZE
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#define UPB 0
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exp $_LtoUset
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pro $_LtoUset,0
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lal SETBASE ; address of initial set
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lol SETSIZE
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los EM_WSIZE ; load initial set
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lol LWB ; low bound
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lol SETLOW
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sbu EM_WSIZE
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stl LWB
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lol UPB ; high bound
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lol SETLOW
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sbu EM_WSIZE
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stl UPB
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1
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lol LWB
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lol UPB
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cmu EM_WSIZE
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zgt *2 ; while low <= high
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lol LWB
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lol SETSIZE
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set ? ; create [low]
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lol SETSIZE
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ior ? ; merge with initial set
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lol LWB
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loc 1
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adu EM_WSIZE
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stl LWB
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bra *1 ; loop back
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2
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lal SETBASE
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lol SETSIZE
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sts EM_WSIZE ; store result over initial set
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ret 0
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end 0
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