scc

simple C compiler
git clone git://git.2f30.org/scc
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ins.c (2467B)

      1 static char sccsid[] = "@(#) ./as/target/z80/ins.c";
      2 
      3 #include <stdlib.h>
      4 #include <string.h>
      5 
      6 #include "../../../inc/scc.h"
      7 #include "../../as.h"
      8 #include "proc.h"
      9 
     10 int
     11 rclass(int reg)
     12 {
     13 	switch (reg) {
     14 	case AREG_B:
     15 	case AREG_C:
     16 	case AREG_D:
     17 	case AREG_E:
     18 	case AREG_H:
     19 	case AREG_L:
     20 	case AREG_A:
     21 		return 1;
     22 	default:
     23 		return 0;
     24 	}
     25 }
     26 
     27 int
     28 pclass(int reg)
     29 {
     30 	switch (reg) {
     31 	case AREG_B:
     32 	case AREG_C:
     33 	case AREG_D:
     34 	case AREG_E:
     35 	case AREG_IXH:
     36 	case AREG_IXL:
     37 	case AREG_A:
     38 		return 1;
     39 	default:
     40 		return 0;
     41 	}
     42 }
     43 
     44 int
     45 qclass(int reg)
     46 {
     47 	switch (reg) {
     48 	case AREG_B:
     49 	case AREG_C:
     50 	case AREG_D:
     51 	case AREG_E:
     52 	case AREG_IYH:
     53 	case AREG_IYL:
     54 	case AREG_A:
     55 		return 1;
     56 	default:
     57 		return 0;
     58 	}
     59 }
     60 
     61 static int
     62 reg2int(int reg)
     63 {
     64 	switch (reg) {
     65 	case AREG_B:   return 0;
     66 	case AREG_C:   return 1;
     67 	case AREG_D:   return 2;
     68 	case AREG_E:   return 3;
     69 	case AREG_IXH:
     70 	case AREG_IYH:
     71 	case AREG_H:   return 4;
     72 	case AREG_IXL:
     73 	case AREG_IYL:
     74 	case AREG_L:   return 5;
     75 	case AREG_A:   return 7;
     76 	default:       abort();
     77 	}
     78 }
     79 
     80 void
     81 r8_imm8(Op *op, Node **args)
     82 {
     83 	Node *par1, *par2;
     84 	unsigned char buf[3];
     85 	int n = op->size;
     86 
     87 	par1 = args[0];
     88 	par2 = args[1];
     89 
     90 	memcpy(buf, op->bytes, n-1);
     91 	buf[n-1] = par2->sym->value;
     92 	buf[n-2] |= reg2int(par1->sym->argtype) << 3;
     93 	emit(cursec, buf, n);
     94 }
     95 
     96 void
     97 imm8(Op *op, Node **args)
     98 {
     99 	Node *par1, *par2;
    100 	unsigned char buf[3];
    101 	int n = op->size;
    102 
    103 	par2 = args[1];
    104 
    105 	memcpy(buf, op->bytes, n-1);
    106 	buf[n-1] = par2->sym->value;
    107 	emit(cursec, buf, n);
    108 }
    109 
    110 void
    111 r8_r8(Op *op, Node **args)
    112 {
    113 	Node *par1, *par2;
    114 	unsigned char buf[3];
    115 	int n = op->size;
    116 
    117 	par1 = args[0];
    118 	par2 = args[1];
    119 	memcpy(buf, op->bytes, n);
    120 	buf[n-1] |= reg2int(par1->sym->argtype) << 3 | 
    121 	            reg2int(par2->sym->argtype);
    122 	emit(cursec, buf, n);
    123 }
    124 
    125 void
    126 xx_r8_2(Op *op, Node **args)
    127 {
    128 	Node *par1, *par2;
    129 	unsigned char buf[3];
    130 	int n = op->size;
    131 
    132 	par1 = args[0];
    133 	par2 = args[1];
    134 
    135 	memcpy(buf, op->bytes, n);
    136 	buf[n-1] |= reg2int(par2->sym->argtype);
    137 	emit(cursec, buf, n);
    138 }
    139 
    140 void
    141 r8_xx_2(Op *op, Node **args)
    142 {
    143 	Node *par1, *par2;
    144 	unsigned char buf[3];
    145 	int n = op->size;
    146 
    147 	par1 = args[0];
    148 	par2 = args[1];
    149 
    150 	memcpy(buf, op->bytes, n);
    151 	buf[n-1] |= reg2int(par2->sym->argtype) << 3;
    152 	emit(cursec, buf, n);
    153 }
    154 
    155 void
    156 r8_xx_1(Op *op, Node **args)
    157 {
    158 	Node *par1, *par2;
    159 	unsigned char buf[3];
    160 	int n = op->size;
    161 
    162 	par1 = args[0];
    163 	par2 = args[1];
    164 
    165 	memcpy(buf, op->bytes, n);
    166 	buf[n-1] |= reg2int(par1->sym->argtype) << 3;
    167 	emit(cursec, buf, n);
    168 }