re PR target/39633 ([avr] loop bug: missing 8-bit comparison (*cmpqi))

gcc/
	PR target/39633
	* config/avr/avr.c (notice_update_cc): For ashiftrt:QI, only
	offsets 1..5 set cc0 in a usable way.

testsuite/
	PR target/39633
	* gcc.target/avr/torture/pr39633.c: New test case.

From-SVN: r176141

gcc/ChangeLog

+2011-07-11  Georg-Johann Lay  <avr@gjlay.de>
+	
+	PR target/39633
+	* config/avr/avr.c (notice_update_cc): For ashiftrt:QI, only
+	offsets 1..5 set cc0 in a usable way.
+
 2011-07-11  Romain Geissler  <romain.geissler@gmail.com>
 
 	* tree.h (call_expr_arg): Remove.

gcc/config/avr/avr.c

@@ -1479,9 +1479,8 @@ notice_update_cc (rtx body ATTRIBUTE_UNUSED, rtx insn)
 	    {
 	      rtx x = XEXP (src, 1);
 
-	      if (GET_CODE (x) == CONST_INT
-		  && INTVAL (x) > 0
-		  && INTVAL (x) != 6)
+	      if (CONST_INT_P (x)
+		  && IN_RANGE (INTVAL (x), 1, 5))
 		{
 		  cc_status.value1 = SET_DEST (set);
 		  cc_status.flags |= CC_OVERFLOW_UNUSABLE;

gcc/testsuite/ChangeLog

+2011-07-11  Georg-Johann Lay  <avr@gjlay.de>
+	
+	PR target/39633
+	* gcc.target/avr/torture/pr39633.c: New test case.
+
 2011-07-11  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/18918

gcc/testsuite/gcc.target/avr/torture/pr39633.c

+/* { dg-do run } */
+
+#include <stdlib.h>
+
+char c = 42;
+
+void __attribute__((noinline,noclone))
+pr39633 (char a)
+{
+  a >>= 7;
+  if (a)
+    c = a;
+}
+
+int main()
+{
+  pr39633 (6);
+
+  if (c != 42)
+    abort();
+
+  exit(0);
+    
+  return 0;
+}