[AArch64 costs 16/18] Cost TRUNCATE

git cherry-pick 4a8f9d5

gcc/

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Cost TRUNCATE.

Change-Id: I1f35e96da1d7fa48ed0e61a5d58590e122390142
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210508 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b6f632e..cbba9a9 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,11 @@
 2014-05-16  James Greenhalgh  <james.greenhalgh@arm.com>
            Philipp Tomsich  <philipp.tomsich@theobroma-systems.com>
 
+       * config/aarch64/aarch64.c (aarch64_rtx_costs): Cost TRUNCATE.
+
+2014-05-16  James Greenhalgh  <james.greenhalgh@arm.com>
+           Philipp Tomsich  <philipp.tomsich@theobroma-systems.com>
+
        * config/aarch64/aarch64.c (aarch64_rtx_costs): Cost FMA,
        FLOAT_EXTEND, FLOAT_TRUNCATE, ABS, SMAX, and SMIN.
 

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 4dfbb8f..5ebf162 100644 (file)
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -5656,6 +5656,39 @@ cost_plus:
        }
       return false;
 
+    case TRUNCATE:
+
+      /* Decompose <su>muldi3_highpart.  */
+      if (/* (truncate:DI  */
+         mode == DImode
+         /*   (lshiftrt:TI  */
+          && GET_MODE (XEXP (x, 0)) == TImode
+          && GET_CODE (XEXP (x, 0)) == LSHIFTRT
+         /*      (mult:TI  */
+          && GET_CODE (XEXP (XEXP (x, 0), 0)) == MULT
+         /*        (ANY_EXTEND:TI (reg:DI))
+                   (ANY_EXTEND:TI (reg:DI)))  */
+          && ((GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == ZERO_EXTEND
+               && GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 1)) == ZERO_EXTEND)
+              || (GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == SIGN_EXTEND
+                  && GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 1)) == SIGN_EXTEND))
+          && GET_MODE (XEXP (XEXP (XEXP (XEXP (x, 0), 0), 0), 0)) == DImode
+          && GET_MODE (XEXP (XEXP (XEXP (XEXP (x, 0), 0), 1), 0)) == DImode
+         /*     (const_int 64)  */
+          && CONST_INT_P (XEXP (XEXP (x, 0), 1))
+          && UINTVAL (XEXP (XEXP (x, 0), 1)) == 64)
+        {
+          /* UMULH/SMULH.  */
+         if (speed)
+           *cost += extra_cost->mult[mode == DImode].extend;
+          *cost += rtx_cost (XEXP (XEXP (XEXP (XEXP (x, 0), 0), 0), 0),
+                            MULT, 0, speed);
+          *cost += rtx_cost (XEXP (XEXP (XEXP (XEXP (x, 0), 0), 1), 0),
+                            MULT, 1, speed);
+          return true;
+        }
+
+      /* Fall through.  */
     default:
       break;
     }