Fix char to ushort cast

tccgen.c:
- gen_cast: add check for char to ushort cast

tests/bug.c:
- remove tst1

tests/tests2/117_gcc_test.c:
- add tst_cast

tccgen.c

@@ -3573,6 +3573,11 @@ again:
             /* ss <= 4 here */
             if (ds <= 4) {
                 gv(RC_INT);
+		if (ds == 2 && (dbt & VT_UNSIGNED) &&
+                    ss == 1 && (sbt & VT_UNSIGNED) == 0) {
+		    vpushi(0xffff);
+		    gen_op('&');
+		}
                 goto done; /* no 64bit envolved */
             }
         }

tests/bug.c

@@ -1,14 +1,6 @@
 #include <stdio.h>
 #include <stdarg.h>
 
-void tst1(void)
-{
-  /* problem in gen_cast. Should mask unsigned types */
-  signed char c = (signed char) 0xffffffff;
-  int r = (unsigned short) c ^ (signed char) 0x99999999;
-  if (r != 0xffff0066) printf ("%x\n", r);
-}
-
 typedef struct{double x,y;}p;
 
 void tst2(int n,...)
@@ -69,7 +61,6 @@ int
 main(void)
 {
   p v = { 1, 2};
-  tst1();
   tst2(1, v);
   tst3();
 }

tests/tests2/117_gcc_test.c

@@ -139,6 +139,13 @@ void tst_pack (void)
   if (j.f != i.f) printf("error\n");
 }
 
+void tst_cast(void)
+{
+  signed char c = (signed char) 0xaaaaaaaa;
+  int r = (unsigned short) c ^ (signed char) 0x99999999;
+  if (r != 0xffff0033) printf ("%x\n", r);
+}
+
 int
 main (void)
 {
@@ -155,4 +162,5 @@ main (void)
   tst_builtin();
   tst_compare();
   tst_pack();
+  tst_cast();
 }