svn commit: r333240 - in head/sys: powerpc/powerpc sys

[Mateusz Guzik]

Author: mjg
Date: Fri May  4 04:00:48 2018
New Revision: 333240
URL: https://svnweb.freebsd.org/changeset/base/333240

Log:
  Allow __builtin_memmove instead of bcopy for small buffers of known size
  
  See r323329 for an explanation why this is a good idea.

Modified:
  head/sys/powerpc/powerpc/bcopy.c
  head/sys/sys/systm.h

Modified: head/sys/powerpc/powerpc/bcopy.c
==============================================================================
--- head/sys/powerpc/powerpc/bcopy.c	Fri May  4 03:44:12 2018	(r333239)
+++ head/sys/powerpc/powerpc/bcopy.c	Fri May  4 04:00:48 2018	(r333240)
@@ -143,7 +143,7 @@ done:
 }
 
 void
-bcopy(const void *src0, void *dst0, size_t length)
+(bcopy)(const void *src0, void *dst0, size_t length)
 {
 
 	memcpy(dst0, src0, length);

Modified: head/sys/sys/systm.h
==============================================================================
--- head/sys/sys/systm.h	Fri May  4 03:44:12 2018	(r333239)
+++ head/sys/sys/systm.h	Fri May  4 04:00:48 2018	(r333240)
@@ -259,6 +259,12 @@ void	hexdump(const void *ptr, int length, const char *
 
 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
 void	bcopy(const void * _Nonnull from, void * _Nonnull to, size_t len);
+#define bcopy(from, to, len) ({				\
+	if (__builtin_constant_p(len) && (len) <= 64)	\
+		__builtin_memmove((to), (from), (len));	\
+	else						\
+		bcopy((from), (to), (len));		\
+})
 void	bzero(void * _Nonnull buf, size_t len);
 #define bzero(buf, len) ({				\
 	if (__builtin_constant_p(len) && (len) <= 64)	\