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package/fftw: add option for fast maths
authorYann E. MORIN <yann.morin.1998@free.fr>
Mon, 16 Mar 2015 16:31:21 +0000 (17:31 +0100)
committerThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Mon, 16 Mar 2015 18:44:02 +0000 (19:44 +0100)
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>
package/fftw/Config.in patch | blob | history
package/fftw/fftw.mk patch | blob | history

diff --git a/package/fftw/Config.in b/package/fftw/Config.in
index 4cefa28edff9c1cd1aad87f43b7fb05cdbf5abb1..4a0706a6beb0935e15dd08704793877ab4eb9623 100644 (file)
--- a/package/fftw/Config.in
+++ b/package/fftw/Config.in
@@ -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
diff --git a/package/fftw/fftw.mk b/package/fftw/fftw.mk
index 78d36e97d7759d0fbb12784b12d6473e3cc5b740..c05012a8e46b8813fc2ed48f585d2803a1dcf881 100644 (file)
--- a/package/fftw/fftw.mk
+++ b/package/fftw/fftw.mk
@@ -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))