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authorWilco Dijkstra <wdijkstr@arm.com>2015-07-13 12:48:33 +0100
committerWilco Dijkstra <wdijkstr@arm.com>2015-07-13 12:48:33 +0100
commit82641e16aa83c693974297951e23ba08a3e89652 (patch)
treec68da0ab29df51c78bb409bcfe5fab445af61047
parentc435989f52204703d524f467c830dc363439e532 (diff)
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Add AArch64 versions of math_opt_barrier and math_force_eval that avoid going via memory.
-rw-r--r--ChangeLog6
-rw-r--r--sysdeps/aarch64/fpu/math_private.h5
2 files changed, 11 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index df8c19eeab..dfef5e0f60 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 b3c2509961..1f02ddb05a 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)
{