From: Senthil Kumar Selvaraj <senthil_kumar.selvaraj@atmel.com>
Date: Tue, 2 Feb 2016 16:01:45 +0000 (+0000)
Subject: avr.c (avr_option_override): Set PARAM_ALLOW_STORE_DATA_RACES to 1.
X-Git-Tag: upstream/12.2.0~49030
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c7088aeac8250400734696d8bb606764880ab5c3;p=platform%2Fupstream%2Fgcc.git

avr.c (avr_option_override): Set PARAM_ALLOW_STORE_DATA_RACES to 1.

	* config/avr/avr.c (avr_option_override): Set
	PARAM_ALLOW_STORE_DATA_RACES to 1.

From-SVN: r233078
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3b548f5..c2d824e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-02  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>
+
+	* config/avr/avr.c (avr_option_override): Set
+	PARAM_ALLOW_STORE_DATA_RACES to 1.
+
 2016-02-02  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/69595
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c
index e557772..a7728e3 100644
--- a/gcc/config/avr/avr.c
+++ b/gcc/config/avr/avr.c
@@ -43,6 +43,7 @@
 #include "expr.h"
 #include "langhooks.h"
 #include "cfgrtl.h"
+#include "params.h"
 #include "builtins.h"
 #include "context.h"
 #include "tree-pass.h"
@@ -410,6 +411,15 @@ avr_option_override (void)
   if (avr_strict_X)
     flag_caller_saves = 0;
 
+  /* Allow optimizer to introduce store data races. This used to be the
+     default - it was changed because bigger targets did not see any
+     performance decrease. For the AVR though, disallowing data races
+     introduces additional code in LIM and increases reg pressure.  */
+
+  maybe_set_param_value (PARAM_ALLOW_STORE_DATA_RACES, 1,
+      global_options.x_param_values,
+      global_options_set.x_param_values);
+
   /* Unwind tables currently require a frame pointer for correctness,
      see toplev.c:process_options().  */