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Change to engage forwardrefmax pragma by default There are enough cases where the forward reference optimization scheme in lwasm makes assembly painfully slow that it warrants enabling this pragma by default to avoid bug reports about lwasm being too slow. Which is is when you have a lot of forward refences or other instruction sizes that don't reduce on pass one. This gets worse exponentially as the source file size gets bigger. The old behaviour is available to anyone who needs or wants it, though. It does work quite well on smallish files or files that do not have a lot of abiguous instruction sizes. It should be noted that this change does not change the correctness of the code output by lwasm. What it might do is result in slightly larger code if the assembler is forced to select a 16 bit mode when an 8 bit mode will do. However, in most cases I've seen, it makes very little difference overall.
author William Astle <lost@l-w.ca>
date Thu, 03 Nov 2016 21:44:32 -0600
parents 6f4c4d59666f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 list.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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21 Implements the program startup code
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22
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23 */
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24
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25 #include <errno.h>
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28 #include <string.h>
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29
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30 #include "lwar.h"
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31
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32 void do_list(void)
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33 {
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34 FILE *f;
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35 char buf[8];
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36 long l;
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37 int c;
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38
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6f4c4d59666f Make lwar use the "b" flag when opening files.
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39 f = fopen(archive_file, "rb");
0
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40 if (!f)
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41 {
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42 perror("Opening archive file");
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43 exit(1);
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44 }
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45
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346966cffeef Clean up various warnings when building under -Wall
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46 (void)(fread(buf, 1, 6, f) && 1);
0
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47 if (memcmp("LWAR1V", buf, 6))
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48 {
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49 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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50 exit(1);
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51 }
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52
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53 for (;;)
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54 {
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55 c = fgetc(f);
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56 if (ferror(f))
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57 {
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58 perror("Reading archive file");
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59 exit(1);
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60 }
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61 if (c == EOF)
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62 return;
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63
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64
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65 // find the end of the file name
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66 if (!c)
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67 return;
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68
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69 while (c)
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70 {
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71 putchar(c);
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72 c = fgetc(f);
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73 if (c == EOF || ferror(f))
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74 {
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75 fprintf(stderr, "Bad archive file\n");
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76 exit(1);
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77 }
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78 }
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79
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80 // get length of archive member
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81 l = 0;
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82 c = fgetc(f);
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83 l = c << 24;
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84 c = fgetc(f);
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85 l |= c << 16;
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86 c = fgetc(f);
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87 l |= c << 8;
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88 c = fgetc(f);
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89 l |= c;
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90 printf(": %04lx bytes\n", l);
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91 fseek(f, l, SEEK_CUR);
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92 }
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93 }