From: H.J. Lu <hongjiu.lu@intel.com>
Date: Thu, 18 Aug 2016 14:59:46 +0000 (+0000)
Subject: Increase MOVE_RATIO to 17 for Lakemont
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=89c8878092d773cf3803a98e60d5632635199125;p=gcc.git

Increase MOVE_RATIO to 17 for Lakemont

Larger MOVE_RATIO will always make code faster.  17 is the number with
smaller code sizes for Lakemont.

gcc/

	PR target/72839
	* config/i386/i386.c (lakemont_cost): Set MOVE_RATIO to 17.

gcc/testsuite/

	PR target/72839
	* gcc.target/i386/pr72839.c: New test.

From-SVN: r239578
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index da653161a66..c54e103d698 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-18  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/72839
+	* config/i386/i386.c (lakemont_cost): Set MOVE_RATIO to 17.
+
 2016-08-18  Chung-Lin Tang  <cltang@codesourcery.com>
 
 	PR middle-end/70895
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index e2c9f7242bd..be027f5e2dd 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -426,7 +426,7 @@ struct processor_costs lakemont_cost = {
   COSTS_N_INSNS (3),			/* cost of movsx */
   COSTS_N_INSNS (2),			/* cost of movzx */
   8,					/* "large" insn */
-  9,					/* MOVE_RATIO */
+  17,					/* MOVE_RATIO */
   6,				     /* cost for loading QImode using movzbl */
   {2, 4, 2},				/* cost of loading integer registers
 					   in QImode, HImode and SImode.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 76799287e46..c35808f9402 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-18  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/72839
+	* gcc.target/i386/pr72839.c: New test.
+
 2016-08-18  Chung-Lin Tang  <cltang@codesourcery.com>
 
 	PR middle-end/70895
diff --git a/gcc/testsuite/gcc.target/i386/pr72839.c b/gcc/testsuite/gcc.target/i386/pr72839.c
new file mode 100644
index 00000000000..ea724f70377
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr72839.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target ia32 } */
+/* { dg-options "-O2 -mtune=lakemont" } */
+
+extern char *strcpy (char *, const char *);
+
+void
+foo (char *s)
+{
+  strcpy (s,
+	  "12345678123456781234567812345678123456781234567812345678"
+	  "1234567");
+}
+
+/* { dg-final { scan-assembler-times "movl\[ \\t\]+\\$\[0-9\]+, \[0-9\]*\\(%\[^,\]+\\)" 16 } } */
+/* { dg-final { scan-assembler-not "rep movsl" } } */
+/* { dg-final { scan-assembler-not "rep movsb" } } */