re PR target/10242 ([ARM] subsequent use of plus and minus operators could be improved)

	PR target/10242
	* arm.md (arm_addsi3): Don't try to split an add with an
	eliminable register until after reload has completed.

From-SVN: r148156

gcc/ChangeLog

+2009-06-04  Richard Earnshaw  <rearnsha@arm.com>
+
+	PR target/10242
+	* arm.md (arm_addsi3): Don't try to split an add with an
+	eliminable register until after reload has completed.
+
 2009-06-03  Ian Lance Taylor  <iant@google.com>
 
 	* dummy-checksum.c (executable_checksum): Use EXPORTED_CONST.
@@ -225,7 +231,7 @@
 
 	* arm.c (arm_get_frame_offsets): Prefer using r3 for padding a
 	push/pop multiple to 8-byte alignment.
-	
+
 2009-06-01  Jakub Jelinek  <jakub@redhat.com>
 
 	* config/i386/i386.c (queued_cfa_restores): New static variable.

gcc/config/arm/arm.md

@@ -620,10 +620,11 @@
    sub%?\\t%0, %1, #%n2
    sub%?\\t%0, %1, #%n2
    #"
-  "TARGET_32BIT &&
-   GET_CODE (operands[2]) == CONST_INT
+  "TARGET_32BIT
+   && GET_CODE (operands[2]) == CONST_INT
    && !(const_ok_for_arm (INTVAL (operands[2]))
-        || const_ok_for_arm (-INTVAL (operands[2])))"
+        || const_ok_for_arm (-INTVAL (operands[2])))
+   && (reload_completed || !arm_eliminable_register (operands[1]))"
   [(clobber (const_int 0))]
   "
   arm_split_constant (PLUS, SImode, curr_insn,