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Because this benchmark performed wl_fixed_to_double conversions
on a long sequence of consecutive integers, the compiler could
optimize away the addition performed in wl_fixed_to_double, merging
it with the loop iteration code. This made tests/fixed-benchmark.c
significantly underestimate the actual cost of the current
wl_fixed_to_double implementation.
Signed-off-by: Manuel Stoeckl <code@mstoeckl.com>
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Fixed benchmark uses main(int argc, char *argv[])
but does not use the arguments, so we can replace them with void
Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
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Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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It was failing with missing include files.
While here, destroy the ugly "../src/..." include
paths used in the tests that was just hacking around
this problem in the Makefile:
sed -i s/..\\/src\\/// tests/*.c
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I was just curious of how much the looping takes time without
conversion, so I added this.
My results on Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz:
benchmarked noop: 1.876349827s
benchmarked magic: 2.245844470s
benchmarked div: 12.709085309s
benchmarked mul: 7.504838141s
Mul seems to take 15x the time magic does, cool!
Btw. the simple default cast of int32_t to double is slower than magic
for me, hence the use of union.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
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