From: Kewen Lin <linkw@gcc.gnu.org>
Date: Fri, 11 Oct 2019 06:01:30 +0000 (+0000)
Subject: vec_promote_demote cost to 1 for non-Power7 VSX architectures
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1e99e6fe6bb61ad2011030324cfdf84d2a67e75d;p=gcc.git

vec_promote_demote cost to 1 for non-Power7 VSX architectures

2019-10-11  Kewen Lin  <linkw@gcc.gnu.org>

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

From-SVN: r276859
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3d9af72764a..df124f07711 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-10-11  Kewen Lin  <linkw@gcc.gnu.org>
+
+	* config/rs6000/rs6000.c (rs6000_builtin_vectorization_cost): Lower
+	vec_promote_demote cost to 1 for non-Power7 VSX architectures.
+
 2019-10-10  Joseph Myers  <joseph@codesourcery.com>
 
 	* ginclude/float.h [!__DEC32_MANT_DIG__]: Do not define DFP
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 3421faf813f..d1434a9f743 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4781,10 +4781,11 @@ rs6000_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
 	  return 1;
 
       case vec_promote_demote:
-        if (TARGET_VSX)
-          return 4;
-        else
-          return 1;
+	/* Power7 has only one permute/pack unit, make it a bit expensive.  */
+	if (TARGET_VSX && rs6000_tune == PROCESSOR_POWER7)
+	  return 4;
+	else
+	  return 1;
 
       case cond_branch_taken:
         return 3;