vec_perm cost to 1 for non-Power7 VSX architectures

gcc/ChangeLog

2019-09-29  Kewen Lin  <linkw@gcc.gnu.org>

    * config/rs6000/rs6000.c (rs6000_builtin_vectorization_cost): Lower
    vec_perm cost to 1 for non-Power7 VSX architectures.

From-SVN: r276267

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9714e98..2c7a847 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2019-09-29  Kewen Lin  <linkw@gcc.gnu.org>
 
+       * config/rs6000/rs6000.c (rs6000_builtin_vectorization_cost): Lower
+       vec_perm cost to 1 for non-Power7 VSX architectures.
+
+2019-09-29  Kewen Lin  <linkw@gcc.gnu.org>
+
        * config/rs6000/vsx.md (vec_pack[su]_float_v2di): New define_expand.
        (vec_unpack_[su]fix_trunc_hi_v4sf): Likewise.
        (vec_unpack_[su]fix_trunc_lo_v4sf): Likewise.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index f136dcb..a344153 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4774,7 +4774,8 @@ rs6000_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
         return 1;
 
       case vec_perm:
-       if (TARGET_VSX)
+       /* Power7 has only one permute unit, make it a bit expensive.  */
+       if (TARGET_VSX && rs6000_tune == PROCESSOR_POWER7)
          return 3;
        else
          return 1;