Add benchmark tests for slowpow and slowexp

Separate benchmarks for the fast and slow implementations of pow and
exp since measuring both together doesn't make sense.  Adjust the
iterations for pow and exp accordingly so that they run long enough
for the measurements to be meaningful.

diff --git a/ChangeLog b/ChangeLog
index 36890d71dd02d5ff46e41481a3bc74c7b1e26f5e..e4b7af4263841c7a99fabf4043e19843445400e3 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2013-04-02  Siddhesh Poyarekar  <siddhesh@redhat.com>
+
+       * benchtests/Makefile: Add benchmarks for slowpow and slowexp.
+       (bench): Add slowexp and slowpow.
+       (exp-ITER): Increase iterations.
+       (pow-ITER): Likewise.
+       * benchtests/exp-inputs: Change input.
+       * benchtests/pow-inputs: Likewise.
+       * benchtests/slowexp-inputs: New file.
+       * benchtests/slowexp.c: New file.
+       * benchtests/slowpow-inputs: New file.
+       * benchtests/slowpow.c: New file.
+
 2013-04-02  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
        * sysdeps/powerpc/powerpc32/fpu/s_rint.S: Remove branch prediction

diff --git a/benchtests/Makefile b/benchtests/Makefile
index cc54b81faa1451fa3eee4f93f7944c377dd0f6aa..b3dfbff971b464d593aac6f9e410fa599d22d5db 100644 (file)
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -25,7 +25,9 @@
 
 # - Define foo-ITER with the number of iterations you want to run.  Keep it
 #   high enough that the overhead of clock_gettime is only a small fraction of
-#   the total run time of the test.
+#   the total run time of the test.  A good idea would be to keep the run time
+#   of each test at around 10 seconds for x86_64.  That is just a guideline,
+#   since some scenarios may require higher run times.
 
 # - Define foo-ARGLIST as a colon separated list of types of the input
 #   arguments.  Use `void` if function does not take any inputs.  Put in quotes
@@ -43,14 +45,16 @@
 #   See pow-inputs for an example.
 
 subdir := benchtests
-bench := exp pow rint
+bench := exp pow rint slowexp slowpow
 
-exp-ITER = 100000
+# exp function fast path
+exp-ITER = 5e8
 exp-ARGLIST = double
 exp-RET = double
 LDFLAGS-bench-exp = -lm
 
-pow-ITER = 100000
+# pow function fast path
+pow-ITER = 2e8
 pow-ARGLIST = double:double
 pow-RET = double
 LDFLAGS-bench-pow = -lm
@@ -60,5 +64,19 @@ rint-ARGLIST = double
 rint-RET = double
 LDFLAGS-bench-rint = -lm
 
+# exp function slowest path
+slowexp-ITER = 3e5
+slowexp-ARGLIST = double
+slowexp-RET = double
+slowexp-INCLUDE = slowexp.c
+LDFLAGS-bench-slowexp = -lm
+
+# pow function slowest path
+slowpow-ITER = 1e5
+slowpow-ARGLIST = double:double
+slowpow-RET = double
+slowpow-INCLUDE = slowpow.c
+LDFLAGS-bench-slowpow = -lm
+
 include ../Makeconfig
 include ../Rules

diff --git a/benchtests/exp-inputs b/benchtests/exp-inputs
index a2086baa86726d55a32960f9f70067dfd52a244e..d81cc0710eb6cf9efd5b920a8453e1e07157b6cd 100644 (file)
--- a/benchtests/exp-inputs
+++ b/benchtests/exp-inputs
@@ -1 +1 @@
-708.00096423260981737257679924368858
+42

diff --git a/benchtests/pow-inputs b/benchtests/pow-inputs
index dbb1270b757bfd31b1c1a7f8c4f332b16230f2f2..2f7cc03b523a94ba6d724f6db5912f8a7d0a3ebd 100644 (file)
--- a/benchtests/pow-inputs
+++ b/benchtests/pow-inputs
@@ -1 +1 @@
-1.0000000000000020, 1.5
+42.0, 42.0

diff --git a/benchtests/slowexp-inputs b/benchtests/slowexp-inputs
new file mode 100644 (file)
index 0000000..a2086ba
--- /dev/null
+++ b/benchtests/slowexp-inputs
@@ -0,0 +1 @@
+708.00096423260981737257679924368858

diff --git a/benchtests/slowexp.c b/benchtests/slowexp.c
new file mode 100644 (file)
index 0000000..92ac5e9
--- /dev/null
+++ b/benchtests/slowexp.c
@@ -0,0 +1,19 @@
+/* Define slowexp.
+   Copyright (C) 2013 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
+   <http://www.gnu.org/licenses/>.  */
+
+#define slowexp exp

diff --git a/benchtests/slowpow-inputs b/benchtests/slowpow-inputs
new file mode 100644 (file)
index 0000000..dbb1270
--- /dev/null
+++ b/benchtests/slowpow-inputs
@@ -0,0 +1 @@
+1.0000000000000020, 1.5

diff --git a/benchtests/slowpow.c b/benchtests/slowpow.c
new file mode 100644 (file)
index 0000000..08f436d
--- /dev/null
+++ b/benchtests/slowpow.c
@@ -0,0 +1,19 @@
+/* Define slowpow.
+   Copyright (C) 2013 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
+   <http://www.gnu.org/licenses/>.  */
+
+#define slowpow pow