From: H.J. Lu <hongjiu.lu@intel.com>
Date: Mon, 24 Aug 2015 15:24:44 +0000 (+0000)
Subject: Update MOVE_RATIO cost for IA MCU
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=03541b0d44b3a91357612de33229e31999e94f84;p=gcc.git

Update MOVE_RATIO cost for IA MCU

This patch updates MOVE_RATIO cost for IA MCU from 6 to 9 so that we
can unroll the loop completely for DOM with -mtune=iamcu.

gcc/

	PR target/67329
	* config/i386/i386.c (iamcu_cost): Set MOVE_RATIO cost to 9.

gcc/testsuite/

	PR target/67329
	* gcc.target/i386/pr67329.c: New test.

From-SVN: r227132
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 33c91dca023..1bac36655a9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/67329
+	* config/i386/i386.c (iamcu_cost): Set MOVE_RATIO cost to 9.
+
 2015-08-24  Renlin Li  <renlin.li@arm.com>
 
 	* config/arm/arm-protos.h (arm_valid_symbolic_address_p): Declare.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 05fa5e10ebf..070605fb4fc 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -436,7 +436,7 @@ struct processor_costs iamcu_cost = {
   COSTS_N_INSNS (3),			/* cost of movsx */
   COSTS_N_INSNS (2),			/* cost of movzx */
   8,					/* "large" insn */
-  6,					/* MOVE_RATIO */
+  9,					/* 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 77c8c23db7f..9161ce4b3b7 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/67329
+	* gcc.target/i386/pr67329.c: New test.
+
 2015-08-24  Nathan Sidwell  <nathan@acm.org>
 
 	* gcc/testsuite/gcc.dg/pr49551.c: Needs -fdata-sections.
diff --git a/gcc/testsuite/gcc.target/i386/pr67329.c b/gcc/testsuite/gcc.target/i386/pr67329.c
new file mode 100644
index 00000000000..a29dd5b4f8d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr67329.c
@@ -0,0 +1,20 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O3 -fno-tree-fre -fno-tree-pre -fdump-tree-optimized -mtune=iamcu" } */
+
+int
+foo ()
+{
+  const int a[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
+  int i, sum;
+
+  sum = 0;
+  for (i = 0; i < sizeof (a) / sizeof (*a); i++)
+    sum += a[i];
+
+  return sum;
+}
+
+/* After late unrolling the above loop completely DOM should be
+   able to optimize this to return 28.  */
+
+/* { dg-final { scan-tree-dump "return 28;" "optimized" } } */