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[glibc] S390: Add support for HP_TIMING_NOW.
- From: Stefan Liebler <stli at sourceware dot org>
- To: glibc-cvs at sourceware dot org
- Date: 18 Sep 2019 14:16:14 -0000
- Subject: [glibc] S390: Add support for HP_TIMING_NOW.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2b680878669e0a7086924de08f60a0747df0029f
commit 2b680878669e0a7086924de08f60a0747df0029f
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Wed Sep 18 16:09:54 2019 +0200
S390: Add support for HP_TIMING_NOW.
This patch adds support for HP_TIMING_NOW if we build at least
with -march=z10 -mzarch. Otherwise we are still using the
generic hp-timing.h.
ChangeLog:
* sysdeps/s390/hp-timing.h: New file.
Diff:
---
ChangeLog | 4 ++++
sysdeps/s390/hp-timing.h | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index 2258e1c..a2baa8e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-09-18 Stefan Liebler <stli@linux.ibm.com>
+
+ * sysdeps/s390/hp-timing.h: New file.
+
2019-09-18 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/riscv/vfork.S: Do not include
diff --git a/sysdeps/s390/hp-timing.h b/sysdeps/s390/hp-timing.h
new file mode 100644
index 0000000..793fb66
--- /dev/null
+++ b/sysdeps/s390/hp-timing.h
@@ -0,0 +1,42 @@
+/* High precision, low overhead timing functions. s390 version.
+ Copyright (C) 2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _HP_TIMING_H
+
+/* The stckf instruction is available starting with z9-109 zarch CPUs.
+ As there is no extra configure check for z9-109, the z10 one is used. */
+#ifdef HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT
+# define _HP_TIMING_H 1
+# include <hp-timing-common.h>
+
+/* We use 64 bit values for the times.
+ Note: Bit 51 is incremented every 0.000 001s = 1us. */
+typedef unsigned long long int hp_timing_t;
+
+# define HP_TIMING_INLINE (1)
+
+# define HP_TIMING_NOW(VAR) \
+ do { \
+ __asm__ __volatile__ ("stckf %0" : "=Q" (VAR) : : "cc"); \
+ } while (0)
+
+#else
+# include_next <hp-timing.h>
+#endif
+
+#endif /* hp-timing.h */