Add nan, snan and inf float constants

tccgen.c

@@ -310,6 +310,16 @@ static void vpushll(long long v)
     vsetc(&ctype, VT_CONST, &cval);
 }
 
+/* push arbitrary 64bit constant */
+void vpush64(int ty, unsigned long long v)
+{
+    CValue cval;
+    CType ctype;
+    ctype.t = ty;
+    cval.ull = v;
+    vsetc(&ctype, VT_CONST, &cval);
+}
+
 /* Return a static symbol pointing to a section */
 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
 {
@@ -3535,6 +3545,21 @@ ST_FUNC void unary(void)
         vtop->sym = s;
         next();
         break;
+    
+    // special qnan , snan and infinity values
+    case TOK___NAN__:
+        vpush64(VT_DOUBLE, 0x7ff8000000000000);
+        next();
+        break;
+    case TOK___SNAN__:
+        vpush64(VT_DOUBLE, 0x7ff0000000000001);
+        next();
+        break;
+    case TOK___INF__:
+        vpush64(VT_DOUBLE, 0x7ff0000000000000);
+        next();
+        break;
+
     default:
     tok_identifier:
         t = tok;

tcctok.h

@@ -81,10 +81,15 @@
      DEF(TOK___TIME__, "__TIME__")
      DEF(TOK___FUNCTION__, "__FUNCTION__")
      DEF(TOK___VA_ARGS__, "__VA_ARGS__")
-     
+
 /* special identifiers */
      DEF(TOK___FUNC__, "__func__")
-     
+
+/* special floating point values */
+     DEF(TOK___NAN__, "__nan__")
+     DEF(TOK___SNAN__, "__snan__")
+     DEF(TOK___INF__, "__inf__")
+
 /* attribute identifiers */
 /* XXX: handle all tokens generically since speed is not critical */
      DEF(TOK_SECTION1, "section")