87 lines
1.4 KiB
C
87 lines
1.4 KiB
C
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#include "bem.h"
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/* Split the intermediate code into procedures.
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This is necessary to make the EM code fit on
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smaller machines. (for the Peephole optimizer!)
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*/
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/* Heuristic is to collect all basic blocks of more then THRESHOLD
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em instructions into a procedure
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*/
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int procnum;
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int threshold; /* can be set by the user */
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fix(lnr)
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int lnr;
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{
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/* this block may not be moved to a procedure */
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Linerecord *lr;
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if(debug) printf("fixate %d\n",lnr);
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for(lr= firstline;lr; lr=lr->nextline)
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if( lr->linenr == lnr)
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lr->fixed=1;
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}
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fixblock(l)
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List *l;
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{
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while(l)
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{
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fix(l->linenr);
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l=l->nextlist;
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}
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}
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phase1()
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{
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/* copy all offloaded blocks */
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Linerecord *lr, *lf,*lr2;
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int blksize;
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lf= lr= firstline;
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blksize= lr->codelines;
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while( lr)
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{
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if( lr->fixed){
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if( !lf->fixed && blksize>threshold)
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{
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/*move block */
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if(debug) printf("%d %d->%d moved\n",
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blksize,lf->linenr, lr->linenr);
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}
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lf= lr;
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blksize= lr->codelines;
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}
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lr= lr->nextline;
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}
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}
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phase2()
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{
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/* copy main procedure */
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prolog2();
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epilogcode();
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}
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split()
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{
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/* selectively copy the intermediate code to procedures */
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Linerecord *lr;
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if( debug) printf("split EM code using %d\n",threshold);
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/* First consolidate the goto's and caller's */
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lr= firstline;
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while(lr)
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{
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fixblock(lr->callers);
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fixblock(lr->gotos);
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lr= lr->nextline;
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}
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/* Copy the temporary file piecewise */
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prologcode();
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phase1();
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phase2();
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}
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