Fix 0.0 and -0.0 handling.
Fix the following issue:
Good:
$ bin/mruby -e 'p(-0.0)' #=> "-0"
Bad:
$ bin/mruby -e 'a=0.0; p(-0.0)' #=> "0"
MODIFY
mrbgems/mruby-compiler/core/codegen.c
mrbgems/mruby-compiler/core/codegen.c
#include <limits.h>
#include <stdlib.h>
#include <string.h>
+#include <math.h>
#include <mruby.h>
#include <mruby/compile.h>
#include <mruby/proc.h>
@@ -566,9 +567,12 @@ new_lit(codegen_scope *s, mrb_value val)
#ifndef MRB_WITHOUT_FLOAT
case MRB_TT_FLOAT:
for (i=0; i<s->irep->plen; i++) {
+ mrb_float f1, f2;
pv = &s->irep->pool[i];
if (mrb_type(*pv) != MRB_TT_FLOAT) continue;
- if (mrb_float(*pv) == mrb_float(val)) return i;
+ f1 = mrb_float(*pv);
+ f2 = mrb_float(val);
+ if (f1 == f2 && !signbit(f1) == !signbit(f2)) return i;
}
break;
#endif

Fix 0.0 and -0.0 handling.

Fix the following issue:

    Good:
    $ bin/mruby -e 'p(-0.0)' #=> "-0"

    Bad:
    $ bin/mruby -e 'a=0.0; p(-0.0)' #=> "0"