PulkoMandy | 17fc759 | 2022-07-28 18:27:54 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Backend for the Fire16 iCE40 SoftCore |
| 3 | * (c) 2019 by Sylvain Munaut |
| 4 | */ |
| 5 | |
| 6 | #include "dt.h" |
| 7 | |
| 8 | |
| 9 | /* This struct can be used to implement machine-specific */ |
| 10 | /* addressing-modes. */ |
| 11 | struct AddressingMode { |
| 12 | int not_used_yet; // FIXME |
| 13 | }; |
| 14 | |
| 15 | /* The number of registers of the target machine. */ |
| 16 | /* - 16 rN GPR + 8 pairs |
| 17 | * - 16 sN GPR + 8 pairs |
| 18 | * - A, X, Y, I |
| 19 | */ |
| 20 | #define MAXR 52 |
| 21 | |
| 22 | /* Number of commandline-options the code-generator accepts. */ |
| 23 | #define MAXGF 20 |
| 24 | |
| 25 | /* If this is set to zero vbcc will not generate ICs where the */ |
| 26 | /* target operand is the same as the 2nd source operand. */ |
| 27 | /* This can sometimes simplify the code-generator, but usually */ |
| 28 | /* the code is better if the code-generator allows it. */ |
| 29 | #define USEQ2ASZ 1 |
| 30 | |
| 31 | /* This specifies the smallest integer type that can be added to a */ |
| 32 | /* pointer. */ |
| 33 | #define MINADDI2P CHAR |
| 34 | |
| 35 | /* This specifies the smallest integer type that can be added to a */ |
| 36 | /* pointer. */ |
| 37 | #define MAXADDI2P INT |
| 38 | |
| 39 | /* If the bytes of an integer are ordered most significant byte */ |
| 40 | /* byte first and then decreasing set BIGENDIAN to 1. */ |
| 41 | #define BIGENDIAN 0 |
| 42 | |
| 43 | /* If the bytes of an integer are ordered lest significant byte */ |
| 44 | /* byte first and then increasing set LITTLEENDIAN to 1. */ |
| 45 | #define LITTLEENDIAN 1 |
| 46 | |
| 47 | /* Note that BIGENDIAN and LITTLEENDIAN are mutually exclusive. */ |
| 48 | |
| 49 | /* If switch-statements should be generated as a sequence of */ |
| 50 | /* SUB,TST,BEQ ICs rather than COMPARE,BEQ ICs set this to 1. */ |
| 51 | /* This can yield better code on some machines. */ |
| 52 | #define SWITCHSUBS 0 |
| 53 | |
| 54 | /* In optimizing compilation certain library memcpy/strcpy-calls */ |
| 55 | /* with length known at compile-time will be inlined using an */ |
| 56 | /* ASSIGN-IC if the size is less or equal to INLINEMEMCPY. */ |
| 57 | /* The type used for the ASSIGN-IC will be UNSIGNED|CHAR. */ |
| 58 | #define INLINEMEMCPY 16 |
| 59 | |
| 60 | /* Parameters are sometimes passed in registers without __reg. */ |
| 61 | #define HAVE_REGPARMS 1 |
| 62 | |
| 63 | /* Structure for reg_parm(). */ |
| 64 | struct reg_handle{ |
| 65 | unsigned long gpr; |
| 66 | }; |
| 67 | |
| 68 | /* We have register pairs. */ |
| 69 | #define HAVE_REGPAIRS 1 |
| 70 | |
| 71 | /* We use unsigned int as size_t rather than unsigned long which */ |
| 72 | /* is the default setting. */ |
| 73 | #define HAVE_INT_SIZET 1 |
| 74 | |
| 75 | /* We have asm_peephole to optimize assembly-output */ |
| 76 | #define HAVE_TARGET_PEEPHOLE 0 /* FIXME: not yet */ |
| 77 | |
| 78 | /* We have some target-specific variable attributes. */ |
| 79 | #define HAVE_TARGET_ATTRIBUTES 1 |
| 80 | |
| 81 | /* We do not have target-specific pragmas */ |
| 82 | #undef HAVE_TARGET_PRAGMAS |
| 83 | |
| 84 | /* We keep track of all registers modified by a function. */ |
| 85 | #define HAVE_REGS_MODIFIED 1 |
| 86 | |
| 87 | /* We have a implement our own cost-functions to adapt |
| 88 | register-allocation */ |
| 89 | #if 0 /* FIXME */ |
| 90 | #define HAVE_TARGET_RALLOC 1 |
| 91 | #define cost_move_reg(x,y) XXX |
| 92 | #define cost_load_reg(x,y) XXX |
| 93 | #define cost_save_reg(x,y) XXX |
| 94 | #define cost_pushpop_reg(x) XXX |
| 95 | #endif |
| 96 | |
| 97 | /* we do not have a mark_eff_ics function, this is used to prevent |
| 98 | optimizations on code which can already be implemented by efficient |
| 99 | assembly */ |
| 100 | #undef HAVE_TARGET_EFF_IC |
| 101 | |
| 102 | /* we do not need extra elements in the IC */ |
| 103 | #undef HAVE_EXT_IC |
| 104 | |
| 105 | /* we need extended types (for pmem/dmem pointers) */ |
| 106 | #define HAVE_EXT_TYPES 1 |
| 107 | |
| 108 | #undef CHAR |
| 109 | #undef SHORT |
| 110 | #undef INT |
| 111 | #undef LONG |
| 112 | #undef LLONG |
| 113 | #undef FLOAT |
| 114 | #undef DOUBLE |
| 115 | #undef LDOUBLE |
| 116 | #undef VOID |
| 117 | #undef POINTER |
| 118 | #undef ARRAY |
| 119 | #undef STRUCT |
| 120 | #undef UNION |
| 121 | #undef ENUM |
| 122 | #undef FUNKT |
| 123 | #undef BOOL |
| 124 | #undef MAXINT |
| 125 | #undef MAX_TYPE |
| 126 | |
| 127 | #define CHAR 1 |
| 128 | #define SHORT 2 |
| 129 | #define INT 3 |
| 130 | #define LONG 4 |
| 131 | #define LLONG 5 |
| 132 | #define FLOAT 6 |
| 133 | #define DOUBLE 7 |
| 134 | #define LDOUBLE 8 |
| 135 | #define VOID 9 |
| 136 | #define DPOINTER 10 |
| 137 | #define PPOINTER 11 |
| 138 | #define ARRAY 12 |
| 139 | #define STRUCT 13 |
| 140 | #define UNION 14 |
| 141 | #define ENUM 15 |
| 142 | #define FUNKT 16 |
| 143 | #define BOOL 17 |
| 144 | #define MAXINT 18 |
| 145 | #define MAX_TYPE MAXINT |
| 146 | |
| 147 | #define POINTER_TYPE(x) pointer_type(x) |
| 148 | extern int pointer_type(); |
| 149 | #define ISPOINTER(x) ((x&NQ)>=DPOINTER&&(x&NQ)<=PPOINTER) |
| 150 | #define ISSCALAR(x) ((x&NQ)>=CHAR&&(x&NQ)<=PPOINTER) |
| 151 | #define ISINT(x) ((x&NQ)>=CHAR&&(x&NQ)<=LLONG) |
| 152 | #define PTRDIFF_T(x) (INT) |
| 153 | |
| 154 | typedef zllong zmax; |
| 155 | typedef zullong zumax; |
| 156 | |
| 157 | union atyps{ |
| 158 | zchar vchar; |
| 159 | zuchar vuchar; |
| 160 | zshort vshort; |
| 161 | zushort vushort; |
| 162 | zint vint; |
| 163 | zuint vuint; |
| 164 | zlong vlong; |
| 165 | zulong vulong; |
| 166 | zllong vllong; |
| 167 | zullong vullong; |
| 168 | zmax vmax; |
| 169 | zumax vumax; |
| 170 | zfloat vfloat; |
| 171 | zdouble vdouble; |
| 172 | zldouble vldouble; |
| 173 | }; |
| 174 | |
| 175 | |
| 176 | /* we need our own printval */ |
| 177 | #define HAVE_TGT_PRINTVAL 1 |
| 178 | |
| 179 | /* we want to replace some ICs with libcalls */ |
| 180 | #define HAVE_LIBCALLS 1 |
| 181 | |
| 182 | /* we much prefer BNE */ |
| 183 | #define HAVE_WANTBNE 1 |
| 184 | |
| 185 | /* size of buffer for asm-output */ |
| 186 | #define EMIT_BUF_LEN 1024 /* should be enough */ |
| 187 | |
| 188 | /* number of asm-output lines buffered */ |
| 189 | #define EMIT_BUF_DEPTH 4 |