Use -ffast-math.

Helps SINC resampler to auto-vectorize.

Makefile

@@ -310,7 +310,7 @@ ifneq ($(V),1)
    Q := @
 endif
 
-OPTIMIZE_FLAG = -O3
+OPTIMIZE_FLAG = -O3 -ffast-math
 ifeq ($(DEBUG), 1)
    OPTIMIZE_FLAG = -O0
 endif

Makefile.win

@@ -221,8 +221,8 @@ ifeq ($(DEBUG), 1)
    CFLAGS += -O0 -g
    CXXFLAGS += -O0 -g
 else
-   CFLAGS += -O3
-   CXXFLAGS += -O3
+   CFLAGS += -O3 -ffast-math
+   CXXFLAGS += -O3 -ffast-math
    LDCXXFLAGS += -s
 endif
 

audio/test/Makefile

@@ -11,7 +11,7 @@ TESTS := test-hermite \
 	test-sinc-highest \
 	test-snr-sinc-highest
 
-CFLAGS += -O3 -g -Wall -pedantic -march=native -std=gnu99 -DRESAMPLER_TEST
+CFLAGS += -O3 -ffast-math -g -Wall -pedantic -march=native -std=gnu99 -DRESAMPLER_TEST
 LDFLAGS += -lm
 
 all: $(TESTS)