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[/] [c16/] [tags/] [V10/] [compiler/] [Backend.cc] - Rev 26
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#include <stdio.h> #include <string.h> #include <assert.h> #include "Backend.hh" #include "Node.hh" extern bool is_loader; extern int memtop; int Backend::stack_pointer = 0; int Backend::label_num = 1; int Backend::function_num = 1; //----------------------------------------------------------------------------- int Backend::check_size(int size, const char * function) { if (size == 1) return 8; if (size == 2) return 16; fprintf(stderr, "Backend::%s does not support %d bits\n", size * 8); return 0; } //----------------------------------------------------------------------------- int Backend::check_size(SUW suw, const char * function) { if (suw == SB) return 8; else if (suw == UB) return 8; else if (suw == WO) return 16; assert(0); } //----------------------------------------------------------------------------- void Backend::file_header() { if (is_loader) fprintf(out, "IN_RX_DATA\t= 0x00\t\t\t;\n" "IN_STATUS\t= 0x01\t\t\t;\n" "\n" "MEMTOP\t\t= 0x%4.4X\n" "\n" "OUT_TX_DATA\t= 0x00\t\t\t;\n" ";---------------------------------------;\n" "RELOC_SRC\t= start+Cend_text-stack\t;\n" ";---------------------------------------;\n" "\t\t\t\t\t;\n" "\tMOVE\t#reloc_rr, RR\t\t;\n" "\tMOVE\tRR, SP\t\t\t;\n" "\tMOVE\t#MEMTOP, LL\t\t; destination\n" "reloc:\t\t\t\t\t;\n" "\tMOVE\t(SP)+, RR\t\t; restore source\n" "\tMOVE\t-(RR), -(LL)\t\t;\n" "\tMOVE\tRR, -(SP)\t\t; save source\n" "\tSHI\tRR, #start\t\t;\n" "\tJMP\tRRNZ, reloc\t\t;\n" "\tMOVE\t#stack, RR\t\t;\n" "\tMOVE\tRR, SP\t\t\t;\n" "\tCALL\tCmain\t\t\t;\n" "halt:\t\t\t\t\t;\n" "\tHALT\t\t\t\t;\n" "reloc_rr:\t\t\t\t; source\n" "\t.WORD\tRELOC_SRC\t\t;\n" ";---------------------------------------;\n" "start:\t\t\t\t\t;\n" "\t.OFFSET\tMEMTOP\t\t\t;\n" "stack:\t\t\t\t\t;\n" ";---------------------------------------;\n", memtop); else fprintf(out, "IN_RX_DATA\t\t= 0x00\t\t;\n" "IN_STATUS\t\t= 0x01\t\t;\n" "IN_TEMPERAT\t\t= 0x02\t\t;\n" "IN_DIP_SWITCH\t\t= 0x03\t\t;\n" "IN_CLK_CTR_LOW\t\t= 0x05\t\t;\n" "IN_CLK_CTR_HIGH\t\t= 0x06\t\t;\n" "\n" "MEMTOP\t=0x%4.4X\n" "\n" "OUT_TX_DATA\t\t= 0x00\t\t;\n" "OUT_LEDS\t\t= 0x02\t\t;\n" "OUT_INT_MASK\t\t= 0x03\t\t;\n" "OUT_RESET_TIMER\t\t= 0x04\t\t;\n" "OUT_START_CLK_CTR\t= 0x05\t\t;\n" "OUT_STOP_CLK_CTR\t= 0x06\t\t;\n" ";---------------------------------------;\n" "\tMOVE\t#MEMTOP, RR\t\t;\n" "\tMOVE\tRR, SP\t\t\t;\n" "\tEI\t\t\t\t;\n" "\tJMP\tCmain\t\t\t;\n" "\tJMP\tCinterrupt\t\t;\n" ";---------------------------------------;\n" "mult_div:\t\t\t\t;\n" "\tMD_STP\t\t\t\t; 1\n" "\tMD_STP\t\t\t\t; 2\n" "\tMD_STP\t\t\t\t; 3\n" "\tMD_STP\t\t\t\t; 4\n" "\tMD_STP\t\t\t\t; 5\n" "\tMD_STP\t\t\t\t; 6\n" "\tMD_STP\t\t\t\t; 7\n" "\tMD_STP\t\t\t\t; 8\n" "\tMD_STP\t\t\t\t; 9\n" "\tMD_STP\t\t\t\t; 10\n" "\tMD_STP\t\t\t\t; 11\n" "\tMD_STP\t\t\t\t; 12\n" "\tMD_STP\t\t\t\t; 13\n" "\tMD_STP\t\t\t\t; 14\n" "\tMD_STP\t\t\t\t; 15\n" "\tMD_STP\t\t\t\t; 16\n" "\tRET\t\t\t\t;\n" ";---------------------------------------;\n", memtop); } //----------------------------------------------------------------------------- void Backend::file_footer() { fprintf(out, "Cend_text:\t\t\t\t;\n"); } //----------------------------------------------------------------------------- int Backend::new_function(const char * fname) { fprintf(out, "C%s:\n", fname); fflush(out); assert(stack_pointer == 0); function_num++; } //----------------------------------------------------------------------------- void Backend::asmbl(const char * asm_string) { if (*asm_string == ' ') fprintf(out, "\t%s\n", asm_string + 1); else fprintf(out, "%s\n", asm_string); char buffer[256]; int bufidx = 0; bool inside = true; for (;;) { char c = *asm_string++; switch(c) { case 0: case '\r': case '\n': buffer[bufidx] = 0; asm_adjust(buffer); bufidx = 0; inside = true; if (c == 0) return; break; case ';' : inside = false; break; case ' ': break; // ignore spaces default: assert(bufidx < (sizeof(buffer) - 3)); if (inside) buffer[bufidx++] = c; } } } //----------------------------------------------------------------------------- void Backend::asm_adjust(const char * asm_line) { int osp = stack_pointer; bool need_adjust = false; if (strstr(asm_line, "-(SP)")) { need_adjust = true; if (strstr(asm_line, "RR,")) stack_pointer -= 2; else if (strstr(asm_line, "R,")) stack_pointer -= 1; else if (strstr(asm_line, "CLRW")) stack_pointer -= 2; else if (strstr(asm_line, "CLRB")) stack_pointer -= 1; } if (strstr(asm_line, "(SP)+")) { need_adjust = true; if (strstr(asm_line, ",RR")) stack_pointer += 2; else if (strstr(asm_line, ",RS")) stack_pointer += 1; else if (strstr(asm_line, ",RU")) stack_pointer += 1; else if (strstr(asm_line, ",LL")) stack_pointer += 2; else if (strstr(asm_line, ",LS")) stack_pointer += 1; else if (strstr(asm_line, ",LU")) stack_pointer += 1; } if (need_adjust && osp == stack_pointer) { fprintf(out, "Bad ASM()\n"); Node::Error(); } } //----------------------------------------------------------------------------- void Backend::load_rr_string(int snum, int offset) { fprintf(out, ";--\tload_rr_string\n"); if (offset) fprintf(out, "\tMOVE\t#Cstr_%d + %d, RR\n", snum, offset); else fprintf(out, "\tMOVE\t#Cstr_%d, RR\n", snum); } //----------------------------------------------------------------------------- void Backend::load_ll_string(int snum, int offset) { fprintf(out, ";--\tload_ll_string\n"); if (offset) fprintf(out, "\tMOVE\t#Cstr_%d + %d, LL\n", snum, offset); else fprintf(out, "\tMOVE\t#Cstr_%d, LL\n", snum); } //----------------------------------------------------------------------------- void Backend::load_rr_constant(int constant) { fprintf(out, ";--\tload_rr_constant\n"); fprintf(out, "\tMOVE\t#0x%4.4X, RR\n", constant & 0xFFFF); } //----------------------------------------------------------------------------- void Backend::load_ll_constant(int constant) { fprintf(out, ";--\tload_ll_constant\n"); fprintf(out, "\tMOVE\t#0x%4.4X, LL\n", constant & 0xFFFF); } //----------------------------------------------------------------------------- void Backend::load_rr_var(const char * name, SUW suw) { fprintf(out, ";--\tload_rr_var %s, (%d bit)\n", name, check_size(suw, "load_rr_var")); if (suw == SB) fprintf(out, "\tMOVE\t(C%s), RS\n", name); else if (suw == UB) fprintf(out, "\tMOVE\t(C%s), RU\n", name); else fprintf(out, "\tMOVE\t(C%s), RR\n", name); } //----------------------------------------------------------------------------- void Backend::load_ll_var(const char * name, SUW suw) { fprintf(out, ";--\tload_ll_var %s, (%d bit)\n", name, check_size(suw, "load_ll_var")); if (suw == SB) fprintf(out, "\tMOVE\t(C%s), LS\n", name); else if (suw == UB) fprintf(out, "\tMOVE\t(C%s), LU\n", name); else fprintf(out, "\tMOVE\t(C%s), LL\n", name); } //----------------------------------------------------------------------------- void Backend::load_rr_var(const char * name, int sp_off, SUW suw) { fprintf(out, ";--\tload_rr_var %s = %d(FP), SP at %d (%d bit)\n", name, sp_off, GetSP(), check_size(suw, "load_rr_var")); sp_off -= GetSP(); if (suw == SB) fprintf(out, "\tMOVE\t%d(SP), RS\n", sp_off); else if (suw == UB) fprintf(out, "\tMOVE\t%d(SP), RU\n", sp_off); else fprintf(out, "\tMOVE\t%d(SP), RR\n", sp_off); } //----------------------------------------------------------------------------- void Backend::load_ll_var(const char * name, int sp_off, SUW suw) { fprintf(out, ";--\tload_ll_var %s = %d(FP), SP at %d (%d bit)\n", name, sp_off, GetSP(), check_size(suw, "load_ll_var")); sp_off -= GetSP(); if (suw == SB) fprintf(out, "\tMOVE\t%d(SP), LS\n", sp_off); else if (suw == UB) fprintf(out, "\tMOVE\t%d(SP), LU\n", sp_off); else fprintf(out, "\tMOVE\t%d(SP), LL\n", sp_off); } //----------------------------------------------------------------------------- void Backend::store_rr_var(const char * name, SUW suw) { fprintf(out, ";--\tstore_rr_var %s\n", name); if (suw == WO) fprintf(out, "\tMOVE\tRR, (C%s)\n", name); else fprintf(out, "\tMOVE\tR, (C%s)\n", name); } //----------------------------------------------------------------------------- void Backend::store_rr_var(const char * name, int sp_off, SUW suw) { fprintf(out, ";--\tstore_rr_var %s = %d(FP), SP at %d\n", name, sp_off, GetSP()); sp_off -= GetSP(); if (suw == WO) fprintf(out, "\tMOVE\tRR, %d(SP)\n", sp_off); else fprintf(out, "\tMOVE\tR, %d(SP)\n", sp_off); } //----------------------------------------------------------------------------- void Backend::load_address(const char * name) { fprintf(out, ";--\tload_address %s\n", name); fprintf(out, "\tMOVE\t#C%s, RR\n", name); } //----------------------------------------------------------------------------- void Backend::load_address(const char * name, int sp_offset) { fprintf(out, ";--\tload_address %s = %d(FP), SP at %d\n", name, sp_offset, GetSP()); fprintf(out, "\tLEA\t%d(SP), RR\n", sp_offset - GetSP()); } //----------------------------------------------------------------------------- void Backend::add_address(const char * name) { fprintf(out, ";--\tadd_address %s\n", name); fprintf(out, "\tADD\tRR, #C%s\n", name); } //----------------------------------------------------------------------------- void Backend::assign(int size) { fprintf(out, ";--\tassign (%d bit)\n", check_size(size, "assign")); if (size == 1) fprintf(out, "\tMOVE\tR, (LL)\n"); else fprintf(out, "\tMOVE\tRR, (LL)\n"); } //----------------------------------------------------------------------------- void Backend::call(const char * name) { fprintf(out, ";--\tcall\n"); fprintf(out, "\tCALL\tC%s\n", name); } //----------------------------------------------------------------------------- void Backend::call_ptr() { fprintf(out, ";--\tcall_ptr\n"); fprintf(out, "\tCALL\t(RR)\n"); } //----------------------------------------------------------------------------- void Backend::ret(int autosize) { fprintf(out, ";--\tret\n"); fprintf(out, "L%d_return:\n", function_num); pop(autosize); fprintf(out, "\tRET\n"); } //----------------------------------------------------------------------------- void Backend::push_rr(SUW suw) { fprintf(out, ";--\tpush_rr (%d bit)\n", check_size(suw, "push_rr")); if (suw == WO) fprintf(out, "\tMOVE\tRR, -(SP)\n"); else fprintf(out, "\tMOVE\tR, -(SP)\n"); stack_pointer--; if (suw == WO) stack_pointer--; } //----------------------------------------------------------------------------- void Backend::pop_rr(SUW suw) { fprintf(out, ";--\tpop_rr (%d bit)\n", check_size(suw, "pop_rr")); if (suw == SB) fprintf(out, "\tMOVE\t(SP)+, RS\n"); else if (suw == UB) fprintf(out, "\tMOVE\t(SP)+, RU\n"); else fprintf(out, "\tMOVE\t(SP)+, RR\n"); stack_pointer++; if (suw == WO) stack_pointer++; } //----------------------------------------------------------------------------- void Backend::pop_ll(SUW suw) { fprintf(out, ";--\tpop_ll (%d bit)\n", check_size(suw, "pop_ll")); if (suw == SB) fprintf(out, "\tMOVE\t(SP)+, LS\n"); else if (suw == UB) fprintf(out, "\tMOVE\t(SP)+, LU\n"); else fprintf(out, "\tMOVE\t(SP)+, LL\n"); stack_pointer++; if (suw == WO) stack_pointer++; } //----------------------------------------------------------------------------- void Backend::pop(int pushed) { fprintf(out, ";--\tpop %d bytes\n", pushed); assert(pushed >= 0); stack_pointer += pushed; if (pushed) fprintf(out, "\tADD\tSP, #%d\n", pushed); } //----------------------------------------------------------------------------- void Backend::pop_return(int ret_bytes) { fprintf(out, ";--\tpop_return %d bytes\n", ret_bytes); if (ret_bytes > 4) pop(ret_bytes); } //----------------------------------------------------------------------------- int Backend::push_return(int ret_bytes) { fprintf(out, ";--\tpush %d bytes\n", ret_bytes); if (ret_bytes <= 4) return 0; push_zero(ret_bytes); return ret_bytes; } //----------------------------------------------------------------------------- void Backend::push_zero(int bytes) { fprintf(out, ";--\tpush_zero %d bytes\n", bytes); stack_pointer -= bytes; // doesn't really matter for (; bytes > 1; bytes -= 2) fprintf(out, "\tCLRW\t-(SP)\n"); if (bytes) fprintf(out, "\tCLRB\t-(SP)\n"); } //----------------------------------------------------------------------------- void Backend::move_rr_to_ll() { fprintf(out, ";--\tmove_rr_to_ll\n"); fprintf(out, "\tMOVE\tRR, LL\n"); } //----------------------------------------------------------------------------- void Backend::label(int lab) { fprintf(out, "L%d_%d:\n", function_num, lab); } //----------------------------------------------------------------------------- void Backend::label(const char * name) { fprintf(out, "L%d_%s:\n", function_num, name); } //----------------------------------------------------------------------------- void Backend::label(const char * name, int loop) { fprintf(out, "L%d_%s_%d:\n", function_num, name, loop); } //----------------------------------------------------------------------------- void Backend::label(const char * name, int loop, int value) { fprintf(out, "L%d_%s_%d_%4.4X:\n", function_num, name, loop, value & 0xFFFF); } //----------------------------------------------------------------------------- void Backend::branch(int lab) { fprintf(out, ";--\tbranch\n"); fprintf(out, "\tJMP\tL%d_%d\n", function_num, lab); } //----------------------------------------------------------------------------- void Backend::branch(const char * name) { fprintf(out, ";--\tbranch\n"); fprintf(out, "\tJMP\tL%d_%s\n", function_num, name); } //----------------------------------------------------------------------------- void Backend::branch(const char * name, int loop) { fprintf(out, ";--\tbranch\n"); fprintf(out, "\tJMP\tL%d_%s_%d\n", function_num, name, loop); } //----------------------------------------------------------------------------- void Backend::branch_true(const char * name, int loop, int size) { fprintf(out, ";--\tbranch_true\n"); fprintf(out, "\tJMP\tRRNZ, L%d_%s_%d\n", function_num, name, loop); } //----------------------------------------------------------------------------- void Backend::branch_false(const char * name, int loop, int size) { fprintf(out, ";--\tbranch_false\n"); fprintf(out, "\tJMP\tRRZ, L%d_%s_%d\n", function_num, name, loop); } //----------------------------------------------------------------------------- void Backend::branch_case(const char * name, int loop, int size, int value) { int bits = check_size(size, "branch_case"); fprintf(out, ";--\tbranch_case (%d bit)\n", bits); fprintf(out, "\tSEQ\tLL, #0x%4.4X\n", value & 0xFFFF); fprintf(out, "\tJMP\tRRNZ, L%d_%s_%d_%4.4X\n", function_num, name, loop, value & 0xFFFF); } //----------------------------------------------------------------------------- void Backend::compute_unary(int what, const char * pretty) { const char * opc = "???"; fprintf(out, ";--\t16 bit %s\n", pretty); switch(what) { case ET_LOG_NOT: opc = "LNOT"; break; case ET_NEGATE: opc = "NEG"; break; case ET_COMPLEMENT: opc = "NOT"; break; default: assert(0 && "Bad unary what"); break; } fprintf(out, "\t%s\tRR\n", opc); } //----------------------------------------------------------------------------- // constant right side (non-constant operand in RR !) // void Backend::compute_binary(int what, bool uns, const char * pretty, int value) { const char * opc = "???"; fprintf(out, ";--\t%s\n", pretty); switch(what) { case ET_BIT_OR: opc = "OR"; break; case ET_BIT_AND: opc = "AND"; break; case ET_BIT_XOR: opc = "XOR"; break; case ET_LEFT: opc = "LSL"; break; case ET_EQUAL: opc = "SEQ"; break; case ET_NOT_EQUAL: opc = "SNE"; break; case ET_LESS_EQUAL: opc = uns ? "SLS" : "SLE"; break; case ET_LESS: opc = uns ? "SLO" : "SLT"; break; case ET_GREATER_EQUAL: opc = uns ? "SHS" : "SGE"; break; case ET_GREATER: opc = uns ? "SHI" : "SGT"; break; case ET_RIGHT: opc = uns ? "LSR" : "ASR"; break; case ET_ADD: if (value == 0) return; opc = "ADD"; if (value > 0) break; opc = "SUB"; value = - value; break; case ET_SUB: if (value == 0) return; opc = "SUB"; if (value > 0) break; opc = "ADD"; value = - value; break; case ET_MULT: // expr * const switch(value & 0xFFFF) // special cases { case 0x0000: fprintf(out, "\tMOVE\t#0, RR\n"); return; case 0x0001: case 0x0002: case 0x0004: case 0x0008: case 0x0010: case 0x0020: case 0x0040: case 0x0080: case 0x0100: case 0x0200: case 0x0400: case 0x0800: case 0x1000: case 0x2000: case 0x4000: mult_shift(value, false); return; case 0xFFFF: case 0xFFFE: case 0xFFFC: case 0xFFF8: case 0xFFF0: case 0xFFE0: case 0xFFC0: case 0xFF80: case 0xFF00: case 0xFE00: case 0xFC00: case 0xF800: case 0xF000: case 0xE000: case 0xC000: case 0x8000: mult_shift(-value, true); return; } fprintf(out, "\tMOVE\tRR, LL\n"); fprintf(out, "\tMOVE\t#0x%4.4X, RR\n", value & 0xFFFF); compute_binary(what, uns, pretty); return; case ET_DIV: // expr / const switch(value & 0xFFFF) // special cases { case 0x0000: assert(0 && "Division by 0"); case 0x0001: case 0x0002: case 0x0004: case 0x0008: case 0x0010: case 0x0020: case 0x0040: case 0x0080: case 0x0100: case 0x0200: case 0x0400: case 0x0800: case 0x1000: case 0x2000: case 0x4000: div_shift(value, false, uns); return; case 0xFFFF: case 0xFFFE: case 0xFFFC: case 0xFFF8: case 0xFFF0: case 0xFFE0: case 0xFFC0: case 0xFF80: case 0xFF00: case 0xFE00: case 0xFC00: case 0xF800: case 0xF000: case 0xE000: case 0xC000: case 0x8000: div_shift(-value, true, uns); return; } fprintf(out, "\tMOVE\tRR, LL\n"); fprintf(out, "\tMOVE\t#0x%4.4X, RR\n", value & 0xFFFF); compute_binary(what, uns, pretty); return; case ET_MOD: // expr % const switch(value & 0xFFFF) // special cases { case 0x0000: assert(0 && "Division by 0"); case 0x0001: case 0x0002: case 0x0004: case 0x0008: case 0x0010: case 0x0020: case 0x0040: case 0x0080: case 0x0100: case 0x0200: case 0x0400: case 0x0800: case 0x1000: case 0x2000: case 0x4000: mod_and(value, false, uns); return; case 0xFFFF: case 0xFFFE: case 0xFFFC: case 0xFFF8: case 0xFFF0: case 0xFFE0: case 0xFFC0: case 0xFF80: case 0xFF00: case 0xFE00: case 0xFC00: case 0xF800: case 0xF000: case 0xE000: case 0xC000: case 0x8000: mod_and(-value, true, uns); return; } fprintf(out, "\tMOVE\tRR, LL\n"); fprintf(out, "\tMOVE\t#0x%4.4X, RR\n", value & 0xFFFF); compute_binary(what, uns, pretty); return; default: assert(0 && "Bad what"); return; } fprintf(out, "\t%s\tRR, #0x%4.4X\n", opc, value & 0xFFFF); } //----------------------------------------------------------------------------- void Backend::mult_shift(int value, bool negative) { assert(value >= 0); if (negative) fprintf(out, "\tNEG\tRR\n"); switch(value) // special cases { case 0x0001: return; case 0x0002: fprintf(out, "\tLSL\tRR, #1\n"); return; case 0x0004: fprintf(out, "\tLSL\tRR, #2\n"); return; case 0x0008: fprintf(out, "\tLSL\tRR, #3\n"); return; case 0x0010: fprintf(out, "\tLSL\tRR, #4\n"); return; case 0x0020: fprintf(out, "\tLSL\tRR, #5\n"); return; case 0x0040: fprintf(out, "\tLSL\tRR, #6\n"); return; case 0x0080: fprintf(out, "\tLSL\tRR, #7\n"); return; case 0x0100: fprintf(out, "\tLSL\tRR, #8\n"); return; case 0x0200: fprintf(out, "\tLSL\tRR, #9\n"); return; case 0x0400: fprintf(out, "\tLSL\tRR, #10\n"); return; case 0x0800: fprintf(out, "\tLSL\tRR, #11\n"); return; case 0x1000: fprintf(out, "\tLSL\tRR, #12\n"); return; case 0x2000: fprintf(out, "\tLSL\tRR, #13\n"); return; case 0x4000: fprintf(out, "\tLSL\tRR, #14\n"); return; case 0x8000: fprintf(out, "\tLSL\tRR, #15\n"); return; default: assert(0); } } //----------------------------------------------------------------------------- void Backend::div_shift(int value, bool negative, bool uns) { assert(value >= 0); if (negative) fprintf(out, "\tNEG\tRR\n"); const char * op = "ASR"; if (uns) op = "LSR"; switch(value) // special cases { case 0x0001: return; case 0x0002: fprintf(out, "\t%s\tRR, #1\n", op); return; case 0x0004: fprintf(out, "\t%s\tRR, #2\n", op); return; case 0x0008: fprintf(out, "\t%s\tRR, #3\n", op); return; case 0x0010: fprintf(out, "\t%s\tRR, #4\n", op); return; case 0x0020: fprintf(out, "\t%s\tRR, #5\n", op); return; case 0x0040: fprintf(out, "\t%s\tRR, #6\n", op); return; case 0x0080: fprintf(out, "\t%s\tRR, #7\n", op); return; case 0x0100: fprintf(out, "\t%s\tRR, #8\n", op); return; case 0x0200: fprintf(out, "\t%s\tRR, #9\n", op); return; case 0x0400: fprintf(out, "\t%s\tRR, #10\n", op); return; case 0x0800: fprintf(out, "\t%s\tRR, #11\n", op); return; case 0x1000: fprintf(out, "\t%s\tRR, #12\n", op); return; case 0x2000: fprintf(out, "\t%s\tRR, #13\n", op); return; case 0x4000: fprintf(out, "\t%s\tRR, #14\n", op); return; case 0x8000: fprintf(out, "\t%s\tRR, #15\n", op); return; default: assert(0); } } //----------------------------------------------------------------------------- void Backend::mod_and(int value, bool negative, bool uns) { assert(value >= 0); if (negative) fprintf(out, "\tNEG\tRR\n"); switch(value) // special cases { case 0x0001: fprintf(out, "\tMOVE\t#0, RR\n"); return; case 0x0002: fprintf(out, "\tAND\tRR, #0x0001\n"); return; case 0x0004: fprintf(out, "\tAND\tRR, #0x0003\n"); return; case 0x0008: fprintf(out, "\tAND\tRR, #0x0007\n"); return; case 0x0010: fprintf(out, "\tAND\tRR, #0x000F\n"); return; case 0x0020: fprintf(out, "\tAND\tRR, #0x001F\n"); return; case 0x0040: fprintf(out, "\tAND\tRR, #0x003F\n"); return; case 0x0080: fprintf(out, "\tAND\tRR, #0x007F\n"); return; case 0x0100: fprintf(out, "\tAND\tRR, #0x00FF\n"); return; case 0x0200: fprintf(out, "\tAND\tRR, #0x01FF\n"); return; case 0x0400: fprintf(out, "\tAND\tRR, #0x03FF\n"); return; case 0x0800: fprintf(out, "\tAND\tRR, #0x07FF\n"); return; case 0x1000: fprintf(out, "\tAND\tRR, #0x0FFF\n"); return; case 0x2000: fprintf(out, "\tAND\tRR, #0x1FFF\n"); return; case 0x4000: fprintf(out, "\tAND\tRR, #0x3FFF\n"); return; case 0x8000: fprintf(out, "\tAND\tRR, #0x7FFF\n"); return; default: assert(0); } } //----------------------------------------------------------------------------- // constant left side (non-constant operand in RR !) // void Backend::compute_binary(int what, bool uns, int value, const char * pretty) { // symmetric operators: exchange left and right... // switch(what) { case ET_BIT_OR: case ET_BIT_AND: case ET_BIT_XOR: case ET_ADD: case ET_MULT: case ET_EQUAL: case ET_NOT_EQUAL: compute_binary(what, uns, pretty, value); return; case ET_LESS_EQUAL: compute_binary(ET_GREATER, uns, ">", value); return; case ET_LESS: compute_binary(ET_GREATER_EQUAL, uns, ">=", value); return; case ET_GREATER_EQUAL: compute_binary(ET_LESS, uns, "<", value); return; case ET_GREATER: compute_binary(ET_LESS_EQUAL, uns, "<=", value); return; } // assymmetric operators: load constant and call non-const operator // switch(what) { case ET_SUB: case ET_LEFT: case ET_RIGHT: case ET_DIV: case ET_MOD: fprintf(out, "\tMOVE\t#0x%4.4X, LL\n", value & 0xFFFF); compute_binary(what, uns, pretty); return; } assert(0 && "Bad what"); } //----------------------------------------------------------------------------- void Backend::compute_binary(int what, bool uns, const char * pretty) { const char * opc = "???"; fprintf(out, ";--\t%s\n", pretty); switch(what) { case ET_BIT_OR: opc = "OR"; break; case ET_BIT_AND: opc = "AND"; break; case ET_BIT_XOR: opc = "XOR"; break; case ET_ADD: opc = "ADD"; break; case ET_SUB: opc = "SUB"; break; case ET_EQUAL: opc = "SEQ"; break; case ET_NOT_EQUAL: opc = "SNE"; break; case ET_LESS_EQUAL: opc = uns ? "SLS" : "SLE"; break; case ET_LESS: opc = uns ? "SLO" : "SLT"; break; case ET_GREATER_EQUAL: opc = uns ? "SHS" : "SGE"; break; case ET_GREATER: opc = uns ? "SHI" : "SGT"; break; case ET_MULT: // expr * expr fprintf(out, "\tDI\n"); if (uns) fprintf(out, "\tMUL_IU\n"); else fprintf(out, "\tMUL_IS\n"); fprintf(out, "\tCALL\tmult_div\n"); fprintf(out, "\tMD_FIN\n"); fprintf(out, "\tEI\n"); return; case ET_DIV: // expr / expr fprintf(out, "\tDI\n"); if (uns) fprintf(out, "\tDIV_IU\n"); else fprintf(out, "\tDIV_IS\n"); fprintf(out, "\tCALL\tmult_div\n"); fprintf(out, "\tMD_FIN\n"); fprintf(out, "\tEI\n"); return; case ET_MOD: // expr % expr fprintf(out, "\tDI\n"); if (uns) fprintf(out, "\tDIV_IU\n"); else fprintf(out, "\tDIV_IS\n"); fprintf(out, "\tCALL\tmult_div\n"); fprintf(out, "\tMOD_FIN\n"); fprintf(out, "\tEI\n"); return; default: assert(0 && "Bad what"); break; } fprintf(out, "\t%s\tLL, RR\n", opc); } //----------------------------------------------------------------------------- void Backend::content(SUW suw) { check_size(suw, "content"); fprintf(out, ";--\tcontent\n"); if (suw == SB) fprintf(out, "\tMOVE\t(RR), RS\n"); else if (suw == UB) fprintf(out, "\tMOVE\t(RR), RU\n"); else fprintf(out, "\tMOVE\t(RR), RR\n"); } //----------------------------------------------------------------------------- void Backend::scale_rr(int size) { assert(size > 0); fprintf(out, ";--\tscale_rr *%d\n", size); if (size == 1) return; check_size(size, "scale_rr"); compute_binary(ET_MULT, false, "*", size); // fprintf(out, "\tLSL\tRR, #%d\n", size); } //----------------------------------------------------------------------------- void Backend::unscale_rr(int size, bool uns) { assert(size > 0); fprintf(out, ";--\tscale *%d\n", size); if (size == 1) return; check_size(size, "unscale_rr"); compute_binary(ET_DIV, uns, "/", size); // if (uns) fprintf(out, "\tLSR\tRR, #%d\n", size); // else fprintf(out, "\tASR\tRR, #%d\n", size); } //-----------------------------------------------------------------------------