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# 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/>.
# Makefile for benchmark tests. The only useful target here is `bench`.
# Adding a new function `foo`:
# ---------------------------
# - Append the function name to the bench variable
# - 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. 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
# if the input argument is a pointer, e.g.:
# malloc-ARGLIST: "void *"
# - Define foo-RET as the type the function returns. Skip if the function
# returns void. One could even skip foo-ARGLIST if the function does not
# take any inputs AND the function returns void.
# - Make a file called `foo-inputs` with one input value per line, an input
# being a comma separated list of arguments to be passed into the function.
# See pow-inputs for an example.
subdir := benchtests
bench := exp pow rint sin atan slowexp slowpow slowsin slowatan
# exp function fast path
exp-ITER = 5e8
exp-ARGLIST = double
exp-RET = double
LDFLAGS-bench-exp = -lm
# pow function fast path
pow-ITER = 2e8
pow-ARGLIST = double:double
pow-RET = double
LDFLAGS-bench-pow = -lm
rint-ITER = 250000000
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
# sin function fast path
sin-ITER = 3e9
sin-ARGLIST = double
sin-RET = double
LDFLAGS-bench-sin = -lm
# atan function fast path
atan-ITER = 6e9
atan-ARGLIST = double
atan-RET = double
LDFLAGS-bench-atan = -lm
# pow function slowest path
slowpow-ITER = 1e5
slowpow-ARGLIST = double:double
slowpow-RET = double
slowpow-INCLUDE = slowpow.c
LDFLAGS-bench-slowpow = -lm
# sin function slowest path
slowsin-ITER = 3e7
slowsin-ARGLIST = double
slowsin-RET = double
slowsin-INCLUDE = slowsin.c
LDFLAGS-bench-slowsin = -lm
# atan function slowest path
slowatan-ITER = 3e8
slowatan-ARGLIST = double
slowatan-RET = double
slowatan-INCLUDE = slowatan.c
LDFLAGS-bench-slowatan = -lm
# Rules to build and execute the benchmarks. Do not put any benchmark
# parameters beyond this point.
include ../Makeconfig
include ../Rules
binaries-bench := $(addprefix $(objpfx)bench-,$(bench))
bench-deps := bench-skeleton.c Makefile
run-bench = $(test-wrapper-env) \
GCONV_PATH=$(common-objpfx)iconvdata LC_ALL=C \
$($*-ENV) $(rtld-prefix) $${run}
bench: $(binaries-bench)
{ for run in $^; do \
echo "Running $${run}" >&2; \
$(run-bench); \
done; } > $(objpfx)bench.out-tmp; \
if [ -f $(objpfx)bench.out ]; then \
mv -f $(objpfx)bench.out $(objpfx)bench.out.old; \
fi; \
mv -f $(objpfx)bench.out-tmp $(objpfx)bench.out
$(binaries-bench): %: %.o \
$(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link)
$(objpfx)bench-%.c: %-inputs $(bench-deps)
{ if [ -n "$($*-INCLUDE)" ]; then \
cat $($*-INCLUDE); \
fi; \
$(..)scripts/bench.pl $(patsubst %-inputs,%,$<) \
$($*-ITER) $($*-ARGLIST) $($*-RET); } > $@-tmp
mv -f $@-tmp $@
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