202 lines
3.6 KiB
C
202 lines
3.6 KiB
C
/*
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* VideoCore IV code generator for the ACK
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* © 2013 David Given
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* This file is redistributable under the terms of the 3-clause BSD license.
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* See the file 'Copying' in the root of the distribution for the full text.
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*/
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#include <stdlib.h>
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#include <limits.h>
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int framesize;
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/*
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* machine dependent back end routines for the Zilog Z80.
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*/
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con_part(int sz, word w)
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{
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while (part_size % sz)
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part_size++;
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if (part_size == TEM_WSIZE)
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part_flush();
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if (sz == 1) {
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w &= 0xFF;
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w <<= 8*(3-part_size);
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part_word |= w;
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} else if (sz == 2) {
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w &= 0xFFFF;
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if (part_size == 0) {
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/* Shift 8 for m68k2, 16 otherwise */
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w <<= 4 * TEM_WSIZE;
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}
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part_word |= w;
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} else {
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assert(sz == TEM_WSIZE);
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part_word = w;
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}
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part_size += sz;
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}
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con_mult(word sz)
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{
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if (argval != 4)
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fatal("bad icon/ucon size");
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fprintf(codefile,".data4 %s\n", str);
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}
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#define CODE_GENERATOR
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#define IEEEFLOAT
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#define FL_MSL_AT_LOW_ADDRESS 1
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#define FL_MSW_AT_LOW_ADDRESS 1
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#define FL_MSB_AT_LOW_ADDRESS 1
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#include <con_float>
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void prolog(full nlocals)
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{
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int ss = nlocals + 8;
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fprintf(codefile, "push fp, lr\n");
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fprintf(codefile, "mov fp, sp\n");
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if (nlocals > 0)
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fprintf(codefile, "sub sp, #%d\n", nlocals);
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framesize = nlocals;
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}
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mes(word type)
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{
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int argt ;
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switch ( (int)type ) {
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case ms_ext :
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for (;;) {
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switch ( argt=getarg(
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ptyp(sp_cend)|ptyp(sp_pnam)|sym_ptyp) ) {
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case sp_cend :
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return ;
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default:
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strarg(argt) ;
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fprintf(codefile,".define %s\n",argstr) ;
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break ;
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}
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}
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default :
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while ( getarg(any_ptyp) != sp_cend ) ;
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break ;
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}
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}
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char *segname[] = {
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".sect .text",
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".sect .data",
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".sect .rom",
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".sect .bss"
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};
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#ifdef REGVARS
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static int savedregsi[32];
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static int numsaved;
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/* Initialise regvar system for one function. */
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void i_regsave(void)
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{
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int i;
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fprintf(codefile, "! i_regsave()\n");
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for (i=0; i<32; i++)
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savedregsi[i] = INT_MAX;
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numsaved = 0;
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}
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/* Mark a register as being saved. */
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void regsave(const char* regname, full offset, int size)
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{
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int regnum = atoi(regname+1);
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savedregsi[regnum] = offset;
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numsaved++;
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fprintf(codefile, "! %d is saved in %s\n", offset, regname);
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#if 0
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fprintf(codefile, "stwu %s, -4(sp)\n", regname);
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if (offset >= 0)
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fprintf(codefile, "lwz %s, %d(fp)\n", regname, offset);
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#endif
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}
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/* Finish saving ragisters. */
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static void saveloadregs(const char* op)
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{
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int minreg = 32;
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int maxreg = -1;
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int i;
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for (i=0; i<32; i++)
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{
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if (savedregsi[i] != INT_MAX)
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{
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if (i < minreg)
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minreg = i;
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if (i > maxreg)
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maxreg = i;
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}
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}
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if (minreg != 32)
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{
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fprintf(codefile, "! saving registers %d to %d\n", minreg, maxreg);
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assert(minreg == 6);
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fprintf(codefile, "%s r6-r%d\n", op, maxreg);
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}
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}
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f_regsave()
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{
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int i;
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fprintf(codefile, "! f_regsave()\n");
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saveloadregs("push");
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for (i=0; i<32; i++)
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{
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int o = savedregsi[i];
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if ((o != INT_MAX) && (o > 0))
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fprintf(codefile, "ld r%d, %d (fp)\n", i, savedregsi[i]);
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}
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}
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/* Restore all saved registers. */
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regreturn()
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{
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fprintf(codefile, "! regreturn()\n");
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saveloadregs("pop");
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}
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/* Calculate the score of a given register. */
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int regscore(full offset, int size, int type, int frequency, int totype)
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{
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int score;
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fprintf(codefile, "! regscore(%ld, %d, %d, %d, %d)\n", offset, size, type, frequency, totype);
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if (size != 4)
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return -1;
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/* Per use: 6 bytes (on average)
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* Overhead in prologue: 4 bytes, plus 4 if a parameter
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* Overhead in epilogue: 0 bytes
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*/
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score = frequency*6 - 4 - ((offset>=0) ? 4 : 0);
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fprintf(codefile, "! local at offset %d has regvar score %d\n", offset, score);
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return score;
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}
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#endif
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