Fixed type promotion of switch case values.

test/val/bug2019-case-value.c

@@ -0,0 +1,77 @@
+/* Bug #2019 - Type promotion in switch statements seems to be broken */
+
+#include <limits.h>
+#include <stdio.h>
+
+unsigned failures;
+
+int f1(void)
+{
+    unsigned char c = 0xFF;
+    switch (c) {
+        case (signed char)0xFF:   break;
+        case (unsigned char)0xFF: return 0;
+    }
+    return -1;
+}
+
+int f2(void)
+{
+    signed char c = SCHAR_MIN;
+    switch (c) {
+        case (unsigned char)SCHAR_MIN: break;
+        case SCHAR_MIN:                return 0;
+    }
+    return -1;
+}
+
+int f3(void)
+{
+    signed int c = (int)UINT_MAX;
+    switch (c) {
+        case UINT_MAX: return 0;
+    }
+    return -1;
+}
+
+int f4(void)
+{
+    unsigned int c = UINT_MAX;
+    switch (c) {
+        case -1L: return 0;
+    }
+    return -1;
+}
+
+int main(void)
+{
+    if (f1())
+    {
+        ++failures;
+        printf("f1() failed\n");
+    }
+
+    if (f2())
+    {
+        ++failures;
+        printf("f2() failed\n");
+    }
+
+    if (f3())
+    {
+        ++failures;
+        printf("f3() failed\n");
+    }
+
+    if (f4())
+    {
+        ++failures;
+        printf("f4() failed\n");
+    }
+
+    if (failures > 0)
+    {
+        printf("failures: %u\n", failures);
+    }
+    return failures;
+}