arm.md (andsi3): Change to zero extension if possible.

	* config/arm/arm.md (andsi3): Change to zero extension if possible.

	* config/arm/thumb2.md (thumb2_zero_extendqisi2_v6): Change the name.

	* gcc.target/arm/pr44999.c: New testcase.

From-SVN: r163184

gcc/ChangeLog

+2010-08-12  Wei Guozhi  <carrot@google.com>
+
+	PR target/44999
+	* config/arm/arm.md (andsi3): Change to zero extension if possible.
+	* config/arm/thumb2.md (thumb2_zero_extendqisi2_v6): Change the name.
+
 2010-08-11  Vladimir Makarov  <vmakarov@redhat.com>
 
 	* ira-int.h (ira_remove_allocno_copy_from_list): Remove.

gcc/config/arm/arm.md

@@ -1937,9 +1937,17 @@
     {
       if (GET_CODE (operands[2]) == CONST_INT)
         {
-          arm_split_constant (AND, SImode, NULL_RTX,
-	                      INTVAL (operands[2]), operands[0],
-			      operands[1], optimize && can_create_pseudo_p ());
+	  if (INTVAL (operands[2]) == 255 && arm_arch6)
+	    {
+	      operands[1] = convert_to_mode (QImode, operands[1], 1);
+	      emit_insn (gen_thumb2_zero_extendqisi2_v6 (operands[0],
+							 operands[1]));
+	    }
+	  else
+	    arm_split_constant (AND, SImode, NULL_RTX,
+				INTVAL (operands[2]), operands[0],
+				operands[1],
+				optimize && can_create_pseudo_p ());
 
           DONE;
         }

gcc/config/arm/thumb2.md

@@ -907,7 +907,7 @@
    (set_attr "neg_pool_range" "*,250")]
 )
 
-(define_insn "*thumb2_zero_extendqisi2_v6"
+(define_insn "thumb2_zero_extendqisi2_v6"
   [(set (match_operand:SI 0 "s_register_operand" "=r,r")
 	(zero_extend:SI (match_operand:QI 1 "nonimmediate_operand" "r,m")))]
   "TARGET_THUMB2 && arm_arch6"

gcc/testsuite/ChangeLog

+2010-08-12  Wei Guozhi  <carrot@google.com>
+
+	PR target/44999
+	* gcc.target/arm/pr44999.c: New testcase.
+
 2010-08-12  Jie Zhang  <jie@codesourcery.com>
 
 	* gcc.dg/graphite/interchange-9.c (M): Define to be 111.

gcc/testsuite/gcc.target/arm/pr44999.c

+/* Use UXTB to extract the lowest byte.  */
+/* { dg-options "-mthumb -Os" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+/* { dg-final { scan-assembler "uxtb" } } */
+
+int tp(int x, int y)
+{
+  return (x & 0xff) - (y & 0xffff);
+}