From: Richard Henderson <rth@twiddle.net>
Date: Thu, 3 Jul 2014 15:56:55 +0000 (-0700)
Subject: alpha: Implement math_opt_barrier and math_force_eval
X-Git-Tag: upstream/2.30~7149
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d5e16ade14822f1a125b6d568b1e3e1326e8868d;p=external%2Fglibc.git

alpha: Implement math_opt_barrier and math_force_eval
---

diff --git a/ChangeLog b/ChangeLog
index 017003e..e84fbbf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2014-07-03  Richard Henderson  <rth@redhat.com>
 
+	* sysdeps/alpha/fpu/math_private.h (math_opt_barrier): New.
+	(math_force_eval): New.
+
 	* sysdeps/alpha/fpu/s_lround.c: Add 0.5 with chopped rounding.
 	* sysdeps/alpha/fpu/s_lroundf.c: Likewise.
 
diff --git a/sysdeps/alpha/fpu/math_private.h b/sysdeps/alpha/fpu/math_private.h
index 22ab3b9..9e06e25 100644
--- a/sysdeps/alpha/fpu/math_private.h
+++ b/sysdeps/alpha/fpu/math_private.h
@@ -13,6 +13,12 @@
 # define __isnanf __isnanf
 #endif
 
+/* Generic code forces values to memory; we don't need to do that.  */
+#define math_opt_barrier(x) \
+  ({ __typeof (x) __x = (x); __asm ("" : "+frm" (__x)); __x; })
+#define math_force_eval(x) \
+  ({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "frm" (__x)); })
+
 #include_next <math_private.h>
 
 #ifdef __alpha_fix__