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[7/7,v5] package/fftw: add option for fast maths

Message ID 984522fc4ea6415f68d5a560cc3a56e5cca08694.1426465664.git.yann.morin.1998@free.fr
State Changes Requested
Headers show

Commit Message

Yann E. MORIN March 16, 2015, 12:31 a.m. UTC 
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>
---
 package/fftw/Config.in | 13 +++++++++++++
 package/fftw/fftw.mk   |  4 ++++
 2 files changed, 17 insertions(+)
diff mbox

Patch

diff --git a/package/fftw/Config.in b/package/fftw/Config.in
index 7fa2c4c..365cbb4 100644
--- a/package/fftw/Config.in
+++ b/package/fftw/Config.in
@@ -46,4 +46,17 @@  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 8ae0824..ecf3e76 100644
--- a/package/fftw/fftw.mk
+++ b/package/fftw/fftw.mk
@@ -27,4 +27,8 @@  FFTW_CONF_OPTS += $(if $(BR2_ARM_CPU_HAS_NEON),--enable,--disable)-neon
 FFTW_CONF_OPTS += $(if $(BR2_TOOLCHAIN_HAS_THREADS),--enable-threads,--disable-threads)
 FFTW_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--enable-openmp,--disable-openmp)
 
+ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
+FFTW_CONF_OPTS += CFLAGS="$(TARGET_CFLAGS) -Ofast"
+endif
+
 $(eval $(autotools-package))