arm-protos.h (arm_attr_length_push_multi): New prototype.

	* config/arm/arm-protos.h (arm_attr_length_push_multi): New prototype.
	* config/arm/arm.c (arm_attr_length_push_multi): New function.
	* config/arm/arm.md (*push_multi): Change the length computation to
	call a C function.

From-SVN: r172169

gcc/ChangeLog

+2011-04-08  Wei Guozhi  <carrot@google.com>
+
+	PR target/47855
+	* config/arm/arm-protos.h (arm_attr_length_push_multi): New prototype.
+	* config/arm/arm.c (arm_attr_length_push_multi): New function.
+	* config/arm/arm.md (*push_multi): Change the length computation to
+	call a C function.
+
 2011-04-08  Anatoly Sokolov  <aesok@post.ru>
 
 	* doc/tm.texi.in (ASM_OUTPUT_BSS): Remove documentation.

gcc/config/arm/arm-protos.h

@@ -152,6 +152,7 @@ extern void arm_expand_sync (enum machine_mode, struct arm_sync_generator *,
 extern const char *arm_output_memory_barrier (rtx *);
 extern const char *arm_output_sync_insn (rtx, rtx *);
 extern unsigned int arm_sync_loop_insns (rtx , rtx *);
+extern int arm_attr_length_push_multi(rtx, rtx);
 
 #if defined TREE_CODE
 extern void arm_init_cumulative_args (CUMULATIVE_ARGS *, tree, rtx, tree);

gcc/config/arm/arm.c

@@ -23696,4 +23696,30 @@ arm_preferred_rename_class (reg_class_t rclass)
     return NO_REGS;
 }
 
+/* Compute the atrribute "length" of insn "*push_multi".
+   So this function MUST be kept in sync with that insn pattern.  */
+int
+arm_attr_length_push_multi(rtx parallel_op, rtx first_op)
+{
+  int i, regno, hi_reg;
+  int num_saves = XVECLEN (parallel_op, 0);
+
+  /* ARM mode.  */
+  if (TARGET_ARM)
+    return 4;
+
+  /* Thumb2 mode.  */
+  regno = REGNO (first_op);
+  hi_reg = (REGNO_REG_CLASS (regno) == HI_REGS) && (regno != LR_REGNUM);
+  for (i = 1; i < num_saves && !hi_reg; i++)
+    {
+      regno = REGNO (XEXP (XVECEXP (parallel_op, 0, i), 0));
+      hi_reg |= (REGNO_REG_CLASS (regno) == HI_REGS) && (regno != LR_REGNUM);
+    }
+
+  if (!hi_reg)
+    return 2;
+  return 4;
+}
+
 #include "gt-arm.h"

gcc/config/arm/arm.md

@@ -10249,6 +10249,8 @@
 ;; Push multiple registers to the stack.  Registers are in parallel (use ...)
 ;; expressions.  For simplicity, the first register is also in the unspec
 ;; part.
+;; To avoid the usage of GNU extension, the length attribute is computed
+;; 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")
@@ -10290,27 +10292,7 @@
   }"
   [(set_attr "type" "store4")
    (set (attr "length")
-	(if_then_else
-	   (and (ne (symbol_ref "TARGET_THUMB2") (const_int 0))
-		(ne (symbol_ref "{
-		    /* Check if there are any high register (except lr)
-		       references in the list. KEEP the following iteration
-		       in sync with the template above.  */
-		    int i, regno, hi_reg;
-		    int num_saves = XVECLEN (operands[2], 0);
-		    regno = REGNO (operands[1]);
-		    hi_reg = (REGNO_REG_CLASS (regno) == HI_REGS)
-			     && (regno != LR_REGNUM);
-		    for (i = 1; i < num_saves && !hi_reg; i++)
-		      {
-			regno = REGNO (XEXP (XVECEXP (operands[2], 0, i), 0));
-			hi_reg |= (REGNO_REG_CLASS (regno) == HI_REGS)
-				  && (regno != LR_REGNUM);
-		      }
-		    !hi_reg;    }")
-		  (const_int 0)))
-	   (const_int 2)
-	   (const_int 4)))]
+	(symbol_ref "arm_attr_length_push_multi (operands[2], operands[1])"))]
 )
 
 (define_insn "stack_tie"