add test related tu issue #1562

test/val/bug1562.c

@@ -0,0 +1,30 @@
+
+/* bug 1562: cc65 generates incorrect code for logical expression with -O */
+
+#include <stdio.h>
+#include <string.h>
+
+int failures = 0;
+
+char input[256];
+
+#define DEBUGTRUE(x) printf("%s=%d\n", #x, (x)); failures += (x) ? 0 : 1
+
+#define DEBUGFALSE(x) printf("%s=%d\n", #x, (x)); failures += (x) ? 1 : 0
+
+int main(void) {
+    char* r;
+    strcpy(input, "\"XYZ\"");
+    r = input+4;
+    DEBUGFALSE(*r != '"');       // = false
+    DEBUGTRUE(*r == '"');       // = true
+    DEBUGFALSE(*(r+1) == '"');   // = false
+    // Next answer should be false because
+    // (false || true && false) is false, but it is true with -O.
+    DEBUGFALSE(*r != '"' || *r == '"' && *(r+1) == '"');
+    // Adding parens fixes it even with -O.
+    DEBUGFALSE(*r != '"' || (*r == '"' && *(r+1) == '"'));
+
+    printf("failures: %d\n", failures);
+    return failures;
+}