From 4688f9e6ca8dfdba22b7d139a9be54871041aadc Mon Sep 17 00:00:00 2001
From: Alex P <dtk077@gmail.com>
Date: Tue, 12 Aug 2025 11:20:19 +0000
Subject: [PATCH] perf(build): add ARM Cortex-A7 optimization flags for audio
 builds

Add compiler optimization flags targeting ARM Cortex-A7 with NEON support
to improve performance of audio library builds and Go binaries. The flags
enable vectorization, fast math, and loop unrolling for better execution
speed on the target hardware.
---
 Makefile                  | 9 ++++++---
 tools/build_audio_deps.sh | 9 +++++++--
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index d257f21..381aa7f 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,9 @@ VERSION ?= 0.4.6
 ALSA_VERSION ?= 1.2.14
 OPUS_VERSION ?= 1.5.2
 
+# Optimization flags for ARM Cortex-A7 with NEON
+OPTIM_CFLAGS := -O3 -mcpu=cortex-a7 -mfpu=neon -mfloat-abi=hard -ftree-vectorize -ffast-math -funroll-loops
+
 PROMETHEUS_TAG := github.com/prometheus/common/version
 KVM_PKG_NAME := github.com/jetkvm/kvm
 
@@ -51,7 +54,7 @@ build_dev: build_audio_deps hash_resource
 	GOOS=linux GOARCH=arm GOARM=7 \
 	CC=$(TOOLCHAIN_DIR)/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-gcc \
 	CGO_ENABLED=1 \
-	CGO_CFLAGS="-I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
+	CGO_CFLAGS="$(OPTIM_CFLAGS) -I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
 	CGO_LDFLAGS="-L$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/src/.libs -lasound -L$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/.libs -lopus -lm -ldl -static" \
 	go build \
 		-ldflags="$(GO_LDFLAGS) -X $(KVM_PKG_NAME).builtAppVersion=$(VERSION_DEV)" \
@@ -79,7 +82,7 @@ build_dev_test: build_audio_deps build_test2json build_gotestsum
 		GOOS=linux GOARCH=arm GOARM=7 \
 		CC=$(TOOLCHAIN_DIR)/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-gcc \
 		CGO_ENABLED=1 \
-		CGO_CFLAGS="-I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
+		CGO_CFLAGS="$(OPTIM_CFLAGS) -I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
 		CGO_LDFLAGS="-L$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/src/.libs -lasound -L$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/.libs -lopus -lm -ldl -static" \
 		go test -v \
 			-ldflags="$(GO_LDFLAGS) -X $(KVM_PKG_NAME).builtAppVersion=$(VERSION_DEV)" \
@@ -106,7 +109,7 @@ build_release: frontend build_audio_deps hash_resource
 	GOOS=linux GOARCH=arm GOARM=7 \
 	CC=$(TOOLCHAIN_DIR)/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-gcc \
 	CGO_ENABLED=1 \
-	CGO_CFLAGS="-I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
+	CGO_CFLAGS="$(OPTIM_CFLAGS) -I$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/include -I$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/celt" \
 	CGO_LDFLAGS="-L$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/src/.libs -lasound -L$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/.libs -lopus -lm -ldl -static" \
 	go build \
 		-ldflags="$(GO_LDFLAGS) -X $(KVM_PKG_NAME).builtAppVersion=$(VERSION)" \
diff --git a/tools/build_audio_deps.sh b/tools/build_audio_deps.sh
index b0125ad..d50d8a1 100644
--- a/tools/build_audio_deps.sh
+++ b/tools/build_audio_deps.sh
@@ -23,12 +23,17 @@ cd "$AUDIO_LIBS_DIR"
 [ -d alsa-lib-${ALSA_VERSION} ] || tar xf alsa-lib-${ALSA_VERSION}.tar.bz2
 [ -d opus-${OPUS_VERSION} ] || tar xf opus-${OPUS_VERSION}.tar.gz
 
+# Optimization flags for ARM Cortex-A7 with NEON
+OPTIM_CFLAGS="-O3 -mcpu=cortex-a7 -mfpu=neon -mfloat-abi=hard -ftree-vectorize -ffast-math -funroll-loops"
+
 export CC="${CROSS_PREFIX}-gcc"
+export CFLAGS="$OPTIM_CFLAGS"
+export CXXFLAGS="$OPTIM_CFLAGS"
 
 # Build ALSA
 cd alsa-lib-${ALSA_VERSION}
 if [ ! -f .built ]; then
-  ./configure --host arm-rockchip830-linux-uclibcgnueabihf --enable-static=yes --enable-shared=no --with-pcm-plugins=rate,linear --disable-seq --disable-rawmidi --disable-ucm
+  CFLAGS="$OPTIM_CFLAGS" ./configure --host arm-rockchip830-linux-uclibcgnueabihf --enable-static=yes --enable-shared=no --with-pcm-plugins=rate,linear --disable-seq --disable-rawmidi --disable-ucm
   make -j$(nproc)
   touch .built
 fi
@@ -37,7 +42,7 @@ cd ..
 # Build Opus
 cd opus-${OPUS_VERSION}
 if [ ! -f .built ]; then
-  ./configure --host arm-rockchip830-linux-uclibcgnueabihf --enable-static=yes --enable-shared=no --enable-fixed-point
+  CFLAGS="$OPTIM_CFLAGS" ./configure --host arm-rockchip830-linux-uclibcgnueabihf --enable-static=yes --enable-shared=no --enable-fixed-point
   make -j$(nproc)
   touch .built
 fi