[PATCH] Fix undefined behavior in h8300 backend

	* config/h8300/h8300.md (andsi3_ashift_n_lower): Avoid undefined
	behavior.

	* gcc.target/h8300/andsi3_ashift_n_lower.c: New test.

From-SVN: r227978

gcc/ChangeLog

+2015-09-21  Jeff Law  <law@redhat.com>
+
+	* config/h8300/h8300.md (andsi3_ashift_n_lower): Avoid undefined
+	behavior. 
+
 2015-09-21  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* config/spu/spu.c (spu_expand_insv): Avoid undefined behavior.

gcc/config/h8300/h8300.md

@@ -3914,7 +3914,8 @@
    (clobber (match_scratch:QI 4 "=X,&r"))]
   "(TARGET_H8300H || TARGET_H8300S)
     && INTVAL (operands[2]) <= 15
-    && INTVAL (operands[3]) == ((-1 << INTVAL (operands[2])) & 0xffff)"
+    && UINTVAL (operands[3]) == ((HOST_WIDE_INT_M1U << INTVAL (operands[2]))
+				 & 0xffff)"
   "#"
   "&& reload_completed"
   [(parallel [(set (match_dup 5)

gcc/testsuite/ChangeLog

+2015-09-21  Jeff Law  <law@redhat.com>
+
+	* gcc.target/h8300/andsi3_ashift_n_lower.c: New test.
+
 2015-09-21  Ville Voutilainen  <ville.voutilainen@gmail.com>
 
 	Complete the implementation of N4230, Nested namespace definition.

gcc/testsuite/gcc.target/h8300/andsi3_ashift_n_lower.c

+/* { dg-do compile }  */
+/* { dg-options "-mh -O2 -fomit-frame-pointer" }  */
+/* { dg-final { scan-assembler-times "extu" 1 } }  */
+
+unsigned long foo(unsigned long a)
+  { return (a << 4) & 0xffff; }
+