From: Chung-Ju Wu <jasonwucj@gmail.com>
Date: Sat, 17 Mar 2018 11:51:46 +0000 (+0000)
Subject: [NDS32] Optimize nds32_register_priority.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6a5a7ee306195abf513fbbb0c4aff717ce3359dc;p=gcc.git

[NDS32] Optimize nds32_register_priority.

gcc/
	* config/nds32/nds32.c (nds32_register_priority): Modify cost.

From-SVN: r258619
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1063fd82f83..0ff36d1ba2c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2018-03-17  Chung-Ju Wu  <jasonwucj@gmail.com>
+
+	* config/nds32/nds32.c (nds32_register_priority): Modify cost.
+
 2018-03-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84902
diff --git a/gcc/config/nds32/nds32.c b/gcc/config/nds32/nds32.c
index 80b00f147dd..02b1eb40a9e 100644
--- a/gcc/config/nds32/nds32.c
+++ b/gcc/config/nds32/nds32.c
@@ -1234,9 +1234,24 @@ static int
 nds32_register_priority (int hard_regno)
 {
   /* Encourage to use r0-r7 for LRA when optimize for size.  */
-  if (optimize_size && hard_regno < 8)
-    return 4;
-  return 3;
+  if (optimize_size)
+    {
+      if (hard_regno < 8)
+	return 4;
+      else if (hard_regno < 16)
+	return 3;
+      else if (hard_regno < 28)
+	return 2;
+      else
+	return 1;
+    }
+  else
+    {
+      if (hard_regno > 27)
+	return 1;
+      else
+	return 4;
+    }
 }