From: Wilco Dijkstra <wdijkstr@arm.com>
Date: Mon, 13 Jul 2015 11:48:33 +0000 (+0100)
Subject: Add AArch64 versions of math_opt_barrier and math_force_eval that avoid going via... 
X-Git-Tag: glibc-2.22~74
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82641e16aa83c693974297951e23ba08a3e89652;p=thirdparty%2Fglibc.git

Add AArch64 versions of math_opt_barrier and math_force_eval that avoid going via memory.
---

diff --git a/ChangeLog b/ChangeLog
index df8c19eeab7..dfef5e0f608 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2015-04-01  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	* sysdeps/aarch64/fpu/math_private.h
+	(define math_opt_barrier): Add AArch64 version.
+	(math_force_eval): Likewise.
+
 2015-07-13  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* sysdeps/aarch64/strlen.S (strlen): Optimize strlen.
diff --git a/sysdeps/aarch64/fpu/math_private.h b/sysdeps/aarch64/fpu/math_private.h
index b3c2509961c..1f02ddb05ae 100644
--- a/sysdeps/aarch64/fpu/math_private.h
+++ b/sysdeps/aarch64/fpu/math_private.h
@@ -22,6 +22,11 @@
 #include <fenv.h>
 #include <fpu_control.h>
 
+#define math_opt_barrier(x) \
+({ __typeof (x) __x = (x); __asm ("" : "+w" (__x)); __x; })
+#define math_force_eval(x) \
+({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "w" (__x)); })
+
 extern __always_inline double
 __ieee754_sqrt (double d)
 {