arm.c (arm_rtx_costs_1): Add costs for ARMv6 value extension instructions.

2008-03-15  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config/arm/arm.c (arm_rtx_costs_1): Add costs for ARMv6 value
	extension instructions.

From-SVN: r133260

gcc/ChangeLog

+2008-03-15  Paul Brook  <paul@codesourcery.com>
+
+	* config/arm/arm.c (arm_rtx_costs_1): Add costs for ARMv6 value
+	extension instructions.
+
 2008-03-15  Richard Guenther  <rguenther@suse.de>
 
 	* tree-ssa-ccp.c (ccp_fold): Also read from constant values

gcc/config/arm/arm.c

@@ -4904,6 +4904,12 @@ arm_rtx_costs_1 (rtx x, enum rtx_code code, enum rtx_code outer)
       /* Fall through */
 
     case PLUS:
+      if (arm_arch6 && mode == SImode
+	  && (GET_CODE (XEXP (x, 0)) == ZERO_EXTEND
+	      || GET_CODE (XEXP (x, 0)) == SIGN_EXTEND))
+	return 1 + (GET_CODE (XEXP (XEXP (x, 0), 0)) == MEM ? 10 : 0)
+		 + (GET_CODE (XEXP (x, 1)) == MEM ? 10 : 0);
+
       if (GET_CODE (XEXP (x, 0)) == MULT)
 	{
 	  extra_cost = rtx_cost (XEXP (x, 0), code);
@@ -5002,12 +5008,17 @@ arm_rtx_costs_1 (rtx x, enum rtx_code code, enum rtx_code outer)
       return 4 + (mode == DImode ? 4 : 0);
 
     case SIGN_EXTEND:
-      /* ??? value extensions are cheaper on armv6. */
+      if (arm_arch_thumb2 && mode == SImode)
+	return 1 + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0);
+
       if (GET_MODE (XEXP (x, 0)) == QImode)
 	return (4 + (mode == DImode ? 4 : 0)
 		+ (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0));
       /* Fall through */
     case ZERO_EXTEND:
+      if (arm_arch6 && mode == SImode)
+	return 1 + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0);
+
       switch (GET_MODE (XEXP (x, 0)))
 	{
 	case QImode: