package/fftw: add option for fast maths
Use FFTW_CFLAGS as intermediate variable, since we're going to need it in a later patch (about NEON optimisations). Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> [based on a patch by Guillaume] Cc: guillaume william brs <guillaume.bressaix@gmail.com> Cc: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com> Tested-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com> Reviewed-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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@ -49,4 +49,17 @@ config BR2_PACKAGE_FFTW_PRECISION_QUAD
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endchoice
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config BR2_PACKAGE_FFTW_FAST
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bool "optimise for speed over accuracy"
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help
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Optimise for fast math functions, at the expense of accuracy.
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Say 'y' if you need speed and can live with inaccuracies in
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the results. Say 'n' (the default) if accuracy is of utmost
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importance.
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This basically uses gcc's -Ofast optimisation level, which in
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turn is basically using gcc's -ffast-math. See the gcc manual
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for what this means.
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endif
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@ -14,4 +14,11 @@ FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-
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FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double
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FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision
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FFTW_CFLAGS = $(TARGET_CFLAGS)
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ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
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FFTW_CFLAGS += -Ofast
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endif
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FFTW_CONF_OPTS += CFLAGS="$(FFTW_CFLAGS)"
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$(eval $(autotools-package))
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