Unify hp-timing implementations

Provide an hp-timing-common.h for ports to use.

2 files changed, 63 insertions, 31 deletions

diff --git a/sysdeps/generic/hp-timing-common.h b/sysdeps/generic/hp-timing-common.h
new file mode 100644
index 0000000..1d7e95e
--- /dev/null
+++ b/sysdeps/generic/hp-timing-common.h
@@ -0,0 +1,62 @@
+/* High precision, low overhead timing functions.  Generic version.
+   Copyright (C) 1998-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* In case a platform supports timers in the hardware the following macros
+   and types must be defined:
+
+   - HP_TIMING_AVAIL: test for availability.
+
+   - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
+     implemented using function calls but instead uses some inlined code
+     which might simply consist of a few assembler instructions.  We have to
+     know this since we might want to use the macros here in places where we
+     cannot make function calls.
+
+   - hp_timing_t: This is the type for variables used to store the time
+     values.  This type must be integral.
+
+   - HP_TIMING_NOW: place timestamp for current time in variable given as
+     parameter.
+*/
+
+/* The target supports hp-timing.  Share the common infrastructure.  */
+
+#include <string.h>
+#include <sys/param.h>
+#include <_itoa.h>
+
+/* Compute the difference between START and END, storing into DIFF.  */
+#define HP_TIMING_DIFF(Diff, Start, End)	((Diff) = (End) - (Start))
+
+/* Accumulate ADD into SUM.  No attempt is made to be thread-safe.  */
+#define HP_TIMING_ACCUM_NT(Sum, Diff)		((Sum) += (Diff))
+
+/* Write a decimal representation of the timing value into the given string.  */
+#define HP_TIMING_PRINT(Dest, Len, Val) 				\
+  do {									\
+    char __buf[20];							\
+    char *__dest = (Dest);						\
+    size_t __len = (Len);						\
+    char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0);		\
+    size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len);	\
+    memcpy (__dest, __cp, __cp_len);					\
+    memcpy (__dest + __cp_len, " cycles",				\
+	    MIN (__len - __cp_len, sizeof (" cycles")));		\
+    __dest[__len - 1] = '\0';						\
+  } while (0)
diff --git a/sysdeps/generic/hp-timing.h b/sysdeps/generic/hp-timing.h
index 49ddb91..95c051d 100644
--- a/sysdeps/generic/hp-timing.h
+++ b/sysdeps/generic/hp-timing.h
@@ -20,39 +20,9 @@
 #ifndef _HP_TIMING_H
 #define _HP_TIMING_H	1
 
-
 /* There are no generic definitions for the times.  We could write something
    using the `gettimeofday' system call where available but the overhead of
-   the system call might be too high.
-
-   In case a platform supports timers in the hardware the following macros
-   and types must be defined:
-
-   - HP_TIMING_AVAIL: test for availability.
-
-   - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
-     implemented using function calls but instead uses some inlined code
-     which might simply consist of a few assembler instructions.  We have to
-     know this since we might want to use the macros here in places where we
-     cannot make function calls.
-
-   - hp_timing_t: This is the type for variables used to store the time
-     values.
-
-   - HP_TIMING_NOW: place timestamp for current time in variable given as
-     parameter.
-
-   - HP_TIMING_DIFF: compute difference between two times and store it
-     in a third.  Source and destination might overlap.
-
-   - HP_TIMING_ACCUM_NT: add time difference to another variable, without
-     being thread-safe.
-
-   - HP_TIMING_PRINT: write decimal representation of the timing value into
-     the given string.  This operation need not be inline even though
-     HP_TIMING_INLINE is specified.
-
-*/
+   the system call might be too high.  */
 
 /* Provide dummy definitions.  */
 #define HP_TIMING_AVAIL		(0)