arm: Convert thumb1 prologue to rtl.

	* config/arm/arm.c (arm_output_function_prologue): Don't call
	thumb1_output_function_prologue.
	(arm_expand_prologue): Avoid dead store.
	(number_of_first_bit_set): Use ctz_hwi.
	(thumb1_emit_multi_reg_push): New.
	(thumb1_expand_prologue): Merge thumb1_output_function_prologue
	to emit the entire prologue as rtl.
	(thumb1_output_interwork): Split out from
	thumb1_output_function_prologue.
	(thumb1_output_function_prologue): Remove.
	(arm_attr_length_push_multi): Handle thumb1.
	* config/arm/arm.md (VUNSPEC_THUMB1_INTERWORK): New.
	(prologue_thumb1_interwork): New.
	(*push_multi): Allow thumb1; use push_mult_memory_operand.
	* config/arm/predicates.md (push_mult_memory_operand): New.

From-SVN: r175605

gcc/ChangeLog

+2011-06-28  Richard Henderson  <rth@redhat.com>
+
+	* config/arm/arm.c (arm_output_function_prologue): Don't call
+	thumb1_output_function_prologue.
+	(arm_expand_prologue): Avoid dead store.
+	(number_of_first_bit_set): Use ctz_hwi.
+	(thumb1_emit_multi_reg_push): New.
+	(thumb1_expand_prologue): Merge thumb1_output_function_prologue
+	to emit the entire prologue as rtl.
+	(thumb1_output_interwork): Split out from
+	thumb1_output_function_prologue.
+	(thumb1_output_function_prologue): Remove.
+	(arm_attr_length_push_multi): Handle thumb1.
+	* config/arm/arm.md (VUNSPEC_THUMB1_INTERWORK): New.
+	(prologue_thumb1_interwork): New.
+	(*push_multi): Allow thumb1; use push_mult_memory_operand.
+	* config/arm/predicates.md (push_mult_memory_operand): New.
+
 2011-06-28  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config/sparc/sync.md (*stbar): Delete.
@@ -863,7 +881,7 @@
 
 2011-06-20  Changpeng Fang  <changpeng.fang@amd.com>
 
-        PR i386/49089
+	PR i386/49089
 	* config/i386/i386.c (avx256_split_unaligned_load): New definition.
 	(avx256_split_unaligned_store): New definition.
 	(ix86_option_override_internal): Enable avx256 unaligned load/store

gcc/config/arm/arm-protos.h

@@ -176,6 +176,7 @@ extern void arm_init_expanders (void);
 extern const char *thumb_unexpanded_epilogue (void);
 extern void thumb1_expand_prologue (void);
 extern void thumb1_expand_epilogue (void);
+extern const char *thumb1_output_interwork (void);
 #ifdef TREE_CODE
 extern int is_called_in_ARM_mode (tree);
 #endif

gcc/config/arm/arm.md

@@ -116,6 +116,8 @@
                         ;   instruction epilogue sequence that isn't expanded
                         ;   into normal RTL.  Used for both normal and sibcall
                         ;   epilogues.
+  VUNSPEC_THUMB1_INTERWORK ; `prologue_thumb1_interwork' insn, used to swap
+			;   modes from arm to thumb.
   VUNSPEC_ALIGN         ; `align' insn.  Used at the head of a minipool table
                         ;   for inlined constants.
   VUNSPEC_POOL_END      ; `end-of-table'.  Used to mark the end of a minipool
@@ -10121,6 +10123,13 @@
   "
 )
 
+(define_insn "prologue_thumb1_interwork"
+  [(unspec_volatile [(const_int 0)] VUNSPEC_THUMB1_INTERWORK)]
+  "TARGET_THUMB1"
+  "* return thumb1_output_interwork ();"
+  [(set_attr "length" "8")]
+)
+
 ;; Note - although unspec_volatile's USE all hard registers,
 ;; USEs are ignored after relaod has completed.  Thus we need
 ;; to add an unspec of the link register to ensure that flow
@@ -10365,10 +10374,10 @@
 ;; in a C function arm_attr_length_push_multi.
 (define_insn "*push_multi"
   [(match_parallel 2 "multi_register_push"
-    [(set (match_operand:BLK 0 "memory_operand" "=m")
+    [(set (match_operand:BLK 0 "push_mult_memory_operand" "")
 	  (unspec:BLK [(match_operand:SI 1 "s_register_operand" "")]
 		      UNSPEC_PUSH_MULT))])]
-  "TARGET_32BIT"
+  ""
   "*
   {
     int num_saves = XVECLEN (operands[2], 0);

gcc/config/arm/predicates.md

@@ -508,6 +508,34 @@
   return true;
 })
 
+(define_predicate "push_mult_memory_operand"
+  (match_code "mem")
+{
+  /* ??? Given how PUSH_MULT is generated in the prologues, is there
+     any point in testing for thumb1 specially?  All of the variants
+     use the same form.  */
+  if (TARGET_THUMB1)
+    {
+      /* ??? No attempt is made to represent STMIA, or validate that
+	 the stack adjustment matches the register count.  This is
+	 true of the ARM/Thumb2 path as well.  */
+      rtx x = XEXP (op, 0);
+      if (GET_CODE (x) != PRE_MODIFY)
+	return false;
+      if (XEXP (x, 0) != stack_pointer_rtx)
+	return false;
+      x = XEXP (x, 1);
+      if (GET_CODE (x) != PLUS)
+	return false;
+      if (XEXP (x, 0) != stack_pointer_rtx)
+	return false;
+      return CONST_INT_P (XEXP (x, 1));
+    }
+
+  /* ARM and Thumb2 handle pre-modify in their legitimate_address.  */
+  return memory_operand (op, mode);
+})
+
 ;;-------------------------------------------------------------------------
 ;;
 ;; Thumb predicates