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package/fftw: add option for fast maths

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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>
This commit is contained in:
Yann E. MORIN 2015-03-16 17:31:21 +01:00 committed by Thomas Petazzoni
parent a990ed296d
commit 96336c6248
2 changed files with 20 additions and 0 deletions
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13
package/fftw/Config.in
View file

@ -49,4 +49,17 @@ config BR2_PACKAGE_FFTW_PRECISION_QUAD
endchoice
config BR2_PACKAGE_FFTW_FAST
bool "optimise for speed over accuracy"
help
Optimise for fast math functions, at the expense of accuracy.
Say 'y' if you need speed and can live with inaccuracies in
the results. Say 'n' (the default) if accuracy is of utmost
importance.
This basically uses gcc's -Ofast optimisation level, which in
turn is basically using gcc's -ffast-math. See the gcc manual
for what this means.
endif

7
package/fftw/fftw.mk
View file

@ -14,4 +14,11 @@ FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-
FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double
FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision
FFTW_CFLAGS = $(TARGET_CFLAGS)
ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
FFTW_CFLAGS += -Ofast
endif
FFTW_CONF_OPTS += CFLAGS="$(FFTW_CFLAGS)"
$(eval $(autotools-package))