From: Kewen Lin <linkw@gcc.gnu.org>
Date: Sun, 29 Sep 2019 09:18:22 +0000 (+0000)
Subject: vec_perm cost to 1 for non-Power7 VSX architectures
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b19d2e5e1a895ee5e331c20f7eec02f3081b3d79;p=gcc.git

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 9714e98df9f..2c7a847e327 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+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.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index f136dcbf8c3..a34415349e6 100644
--- 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;