7e9348169c
The new feature "reglap" allows two sizes of floating-point register
variables (reg_float), if each register overlaps a single register of
the other size. PowerPC ncg uses reglap to define 4-byte instances
of f14 to f31 that overlap the 8-byte instances.
When ncgg sees the definition of fs14("f14")=f14, it removes the
8-byte f14 from its rvnumbers array, and adds the 4-byte fs14 in its
place. Later, when ncg puts a variable in fs14, if it is an 8-byte
variable, then ncg switches to the 8-byte f14. The code has
/* reglap */ comments in util/ncgg or #ifdef REGLAP in mach/proto/ncg
reglap became necessary because my commit a20b87c caused PowerPC ego
to allocate reg_float in both 4-byte and 8-byte sizes.
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* (c) copyright 1987 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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#ifndef NORCSID
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static char rcsid[]= "$Id$";
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#endif
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#include "param.h"
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#include "reg.h"
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#include "property.h"
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#include "token.h"
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#include "set.h"
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#include "instruct.h"
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#include "lookup.h"
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#include "extern.h"
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#include <cgg_cg.h>
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int wordsize;
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int pointersize;
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int nregs=1;
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int nprops;
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int ntokens=1;
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int nsets;
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int ninstr;
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int codeindex;
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int empatlen,emrepllen,emmnem[EMPATMAX];
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int maxempatlen, maxemrepllen;
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int empatexpr;
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int tokpatlen,tokrepllen,tokpatset[TOKPATMAX],tokpatro[TOKPATMAX];
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int maxtokpatlen, maxtokrepllen;
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int nallreg,allreg[MAXALLREG];
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int cursetno = -1;
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int allsetno;
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int inproc=0; /* scanning "procedure" */
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int callproc=0;
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int fc1=1,fc2=1,fc3=1,fc4=1;
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int maxmembers=0;
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int regclass=1;
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int maxtokensize=0;
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int rvused=0;
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int reglap=0;
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int nregvar[4];
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int rvsize[4];
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int rvnumbers[4][MAXREGVAR];
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int procarg[MAXPROCARG];
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int maxprocargs, nprocargs;
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reginfo l_regs[MAXREGS];
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propinfo l_props[MAXPROPS];
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token_p l_tokens[MAXTOKENS];
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set_t l_sets[MAXSETS];
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instr_t l_instr[MAXINSTR];
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symbol *symhash[NSYMHASH];
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