mips.c (mips_rtx_costs): Fix cost estimate for nor (AND (NOT OP1) (NOT OP2)).

2013-10-22  Steve Ellcey  <sellcey@mips.com>

	* config/mips/mips.c (mips_rtx_costs):  Fix cost estimate for nor
	(AND (NOT OP1) (NOT OP2)).

From-SVN: r203932

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c1d3ba81e39b4d66ccb9975dfb0928913f1bead7..71fdd7d4b10ad277761adf9ea2bd34c840b02965 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2013-10-22  Steve Ellcey  <sellcey@mips.com>
+
+       * config/mips/mips.c (mips_rtx_costs):  Fix cost estimate for nor
+       (AND (NOT OP1) (NOT OP2)).
+
 2013-10-22  Bill Schmidt  <wschmidt@vnet.ibm.com>
 
        * config/rs6000/rs6000.c (altivec_expand_vec_perm_const): Reverse

diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 5993aabe5781e1f6a010b4b0006d11dda3cda368..60e5e788f902fef2d9aa1e3e762d1f34441a3963 100644 (file)
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -3796,6 +3796,18 @@ mips_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
              return true;
            }
        }
+      /* (AND (NOT op0) (NOT op1) is a nor operation that can be done in
+        a single instruction.  */
+      if (!TARGET_MIPS16
+         && GET_CODE (XEXP (x, 0)) == NOT
+         && GET_CODE (XEXP (x, 1)) == NOT)
+       {
+         cost = GET_MODE_SIZE (mode) > UNITS_PER_WORD ? 2 : 1;
+          *total = (COSTS_N_INSNS (cost)
+                   + set_src_cost (XEXP (XEXP (x, 0), 0), speed)
+                   + set_src_cost (XEXP (XEXP (x, 1), 0), speed));
+         return true;
+       }
            
       /* Fall through.  */