switch statements

[gtoal]

Sorry, I'm not up to speed on this github pulling lark, but if you don't mind adding it yourself, I think this code will add the switch statement to mir2c.c:

gtoal@hplinux:~/src/mir$ diff mir2c/mir2c.c mir-master/mir2c/mir2c.c
344c344
<     fprintf (f, " = (int64_t)alloca (");
---
>     fprintf (f, " = alloca (");
578,605d577
<   case MIR_SWITCH:
<     /* Using GCC extensions, the missing switch statement could be translated as:
<          goto *(void *[]){&&l5, &&l6, &&l7, &&l8, &&l9, &&l10, &&l11, &&l12}[I_12];
<        or if not GCC then create a switch and have each switch case do 'goto l5;' etc.
<        (that example is from the Duff's Device test)
<      */
<     fprintf(f, "#ifdef __GNUC__\n");
<     fprintf(f, "  goto *(void *[]){");
<     for (int i = 1; i < insn->nops; i++) {
<       fprintf(f, "&&");
<       out_op(ctx, f, insn->ops[i]);
<       if (i < insn->nops-1) fprintf(f, ",");
<     }
<     fprintf(f, "}[");
<     out_op(ctx, f, insn->ops[0]);
<     fprintf(f, "];\n");
<     fprintf(f, "  #else /* not __GNUC__ */\n");
<     fprintf(f, "  switch (");
<     out_op(ctx, f, insn->ops[0]);
<     fprintf(f, ") {\n");
<     for (int i = 1; i < insn->nops; i++) {
<       fprintf(f, "    case %d: goto ", i-1);
<       out_op(ctx, f, insn->ops[i]);
<       fprintf(f, ";\n");
<     }
<     fprintf(f, "  };\n");
<     fprintf(f, "  #endif /* not __GNUC__ */\n");
<     break;
809c781
<   fprintf (f, "#include <stdint.h>\n#include <stdarg.h>\n#include <alloca.h>\n");
---
>   fprintf (f, "#include <stdint.h>\n#include <stdarg.h>\n");

(PS It took me a minute to realise why building mir on my primary linux system gave so many errors - although it builds on an x86_64 architecture, it doesn't compile on an i686 machine. It ought to compile as a cross-compiler even though it's not a supported target architecture. Or at least give a helpful error from the build process.)