Commit 96336c62 authored by Yann E. MORIN's avatar Yann E. MORIN Committed by Thomas Petazzoni
Browse files

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: default avatar"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: default avatarGwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Reviewed-by: default avatarGwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent a990ed29

package/fftw/Config.in

+13 −0
Original line number Diff line number Diff line
@@ -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

package/fftw/fftw.mk

+7 −0
Original line number Diff line number Diff line
@@ -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))