re PR target/5170 (Supicious code in arm.md)

PR target/5170
* arm.md (split pattern for thumb shiftable immediates): Add comment
explaining non-obvious test.

From-SVN: r50814

gcc/ChangeLog

 2002-03-15  Richard Earnshaw  <rearnsha@arm.com>
 
+	PR target/5170
+	* arm.md (split pattern for thumb shiftable immediates): Add comment
+	explaining non-obvious test.
+
+2002-03-15  Richard Earnshaw  <rearnsha@arm.com>
+
 	PR target/5712
 	* arm.md (movaddr, movaddr_insn): Delete.
 

gcc/config/arm/arm.md

@@ -4124,6 +4124,7 @@
       if ((val & (mask << i)) == val)
         break;
 
+    /* Shouldn't happen, but we don't want to split if the shift is zero.  */
     if (i == 0)
       FAIL;