13219Smckusick /* Copyright (c) 1979 Regents of the University of California */ 23219Smckusick 3*3281Smckusic static char sccsid[] = "@(#)tmps.c 1.3 03/16/81"; 43219Smckusick 53219Smckusick #include "whoami.h" 63219Smckusick #include "0.h" 73280Smckusic #ifdef PC 83280Smckusic # include "pc.h" 93280Smckusic #endif PC 103219Smckusick 113219Smckusick /* 123280Smckusic * This routine defines the register allocation strategy 133280Smckusic * All temporaries are allocated here, and this routines decides 143280Smckusic * where they are to be put. 153280Smckusic */ 16*3281Smckusic #ifdef PC 173280Smckusic #ifdef VAX 183280Smckusic # define MAXREGS 6 193280Smckusic # define REGSIZ 4 203280Smckusic # define FIRSTREG 6 213280Smckusic #else 223280Smckusic #ifdef PDP11 233280Smckusic # define MAXREGS 3 243280Smckusic # define REGSIZ 2 253280Smckusic # define FIRSTREG 2 263280Smckusic #else 273280Smckusic # define MAXREGS 0 283280Smckusic # define REGSIZ 0 293280Smckusic # define FIRSTREG 0 303280Smckusic #endif PDP11 313280Smckusic #endif VAX 32*3281Smckusic #endif PC 333280Smckusic 343280Smckusic /* 353219Smckusick * allocate runtime temporary variables 363219Smckusick */ 373219Smckusick long 383280Smckusic tmpalloc(size, type, mode) 393219Smckusick long size; 403219Smckusick struct nl *type; 413280Smckusic int mode; 423219Smckusick { 433280Smckusic register struct om *op = &sizes[ cbn ]; 443280Smckusic register int offset; 453219Smckusick 463280Smckusic # ifdef PC 473280Smckusic if (mode == REGOK && size <= REGSIZ && 483280Smckusic op->curtmps.reg_off < MAXREGS) { 493280Smckusic offset = op->curtmps.reg_off++; 503280Smckusic if ( offset > op->reg_max ) { 513280Smckusic op->reg_max = offset; 523280Smckusic } 533280Smckusic /* 543280Smckusic * the register number is encoded as an odd negative number 553280Smckusic * which can never appear as an address. 563280Smckusic */ 573280Smckusic return -(((offset + FIRSTREG) << 1) + 1); 583280Smckusic } 593280Smckusic # endif PC 603280Smckusic offset = op->curtmps.om_off -= size; 613280Smckusic if ( offset < op->om_max ) { 623280Smckusic op->om_max = offset; 633219Smckusick } 643219Smckusick # ifdef PC 653219Smckusick putlbracket( ftnno , -offset ); 663219Smckusick # endif PC 673219Smckusick return offset; 683219Smckusick } 693280Smckusic 703219Smckusick /* 713219Smckusick * deallocate runtime temporary variables 723219Smckusick */ 733219Smckusick tmpfree(restore) 743280Smckusic register struct tmps *restore; 753219Smckusick { 763280Smckusic register struct om *op = &sizes[ cbn ]; 773219Smckusick 783280Smckusic # ifdef PC 793280Smckusic if (restore->reg_off < op->curtmps.reg_off) { 803280Smckusic op->curtmps.reg_off = restore->reg_off; 813280Smckusic } 823280Smckusic # endif PC 833280Smckusic if (restore->om_off > op->curtmps.om_off) { 843280Smckusic op->curtmps.om_off = restore->om_off; 853219Smckusick # ifdef PC 863280Smckusic putlbracket( ftnno , -restore->om_off ); 873219Smckusick # endif PC 883219Smckusick } 893219Smckusick } 903280Smckusic 91*3281Smckusic #ifdef PC 923280Smckusic #ifdef VAX 933280Smckusic /* 943280Smckusic * create a save mask for registers which have been used 953280Smckusic * in this level 963280Smckusic */ 973280Smckusic savmask() 983280Smckusic { 993280Smckusic short mask; 1003280Smckusic int i; 1013280Smckusic 1023280Smckusic mask = RSAVEMASK; 1033280Smckusic if (opt('t')) 1043280Smckusic mask |= RUNCHECK; 1053280Smckusic for (i = 0; i <= sizes[ cbn ].reg_max; i++) 1063280Smckusic mask |= 1 << (FIRSTREG + i); 1073280Smckusic return mask; 1083280Smckusic } 1093280Smckusic #endif VAX 110*3281Smckusic #endif PC 111