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Enable AVX2 for FFTW Windows build to suppress SSE2-only warning

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FFTW emits '#warning Only SSE and SSE2 are available' when cross-compiling
with a generic x86_64 target: the configure test for AVX intrinsics fails
without an explicit -mavx flag, so FFTW silently falls back to SSE2.

Fix: pass CFLAGS="-march=haswell" to configure, which enables SSE2/AVX/AVX2/FMA.
Add --enable-avx2 alongside existing --enable-avx.
FFTW_MARCH is overridable for older CPU targets:
  make -f Makefile.windows FFTW_MARCH=-march=sandybridge  # AVX only, 2011+
  make -f Makefile.windows FFTW_MARCH=-march=core2        # SSSE3, 2007+

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Uladzimir Karpenka 2026-06-02 13:39:24 +03:00
parent a3385bd1f9
commit edd8991a3c
1 changed files with 8 additions and 0 deletions
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8
Makefile.windows
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@ -38,15 +38,23 @@ FFTW_INST := $(CURDIR)/third_party/fftw-win64
FFTW_BUILD_D := $(FFTW_INST)/build-double FFTW_BUILD_D := $(FFTW_INST)/build-double
FFTW_BUILD_F := $(FFTW_INST)/build-float FFTW_BUILD_F := $(FFTW_INST)/build-float
# FFTW_MARCH задаёт минимальный набор инструкций для Windows-бинарника.
# haswell (2013+) гарантирует AVX2+FMA — оптимальный выбор для SDR на современном ПК.
# Для совместимости со старыми машинами замените на -march=sandybridge (AVX, 2011+)
# или -march=core2 (SSSE3, 2007+).
FFTW_MARCH ?= -march=haswell
FFTW_CONF_COMMON = \ FFTW_CONF_COMMON = \
--host=$(MINGW_PREFIX) \ --host=$(MINGW_PREFIX) \
CC=$(CC) \ CC=$(CC) \
CFLAGS="$(FFTW_MARCH)" \
--prefix=$(FFTW_INST) \ --prefix=$(FFTW_INST) \
--enable-shared \ --enable-shared \
--disable-static \ --disable-static \
--with-our-malloc \ --with-our-malloc \
--enable-sse2 \ --enable-sse2 \
--enable-avx \ --enable-avx \
--enable-avx2 \
--disable-fortran \ --disable-fortran \
--quiet --quiet