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Fix ARMv7 optimizations for DNN code

--- a/dnn/vec_neon.h

+++ b/dnn/vec_neon.h

@@ -39,6 +39,14 @@

 static OPUS_INLINE int32x4_t vcvtnq_s32_f32(float32x4_t x) {

   return vrshrq_n_s32(vcvtq_n_s32_f32(x, 8), 8);

 }

+

+static OPUS_INLINE int16x8_t vpaddq_s16(int16x8_t a, int16x8_t b) {

+  return vcombine_s16(vpadd_s16(vget_low_s16(a), vget_high_s16(a)), vpadd_s16(vget_low_s16(b), vget_high_s16(b)));

+}

+

+static OPUS_INLINE int16x8_t vmull_high_s8(int8x16_t a, int8x16_t b) {

+  return vmull_s8(vget_high_s8(a), vget_high_s8(b));

+}

 #endif

 #ifndef LPCNET_TEST

-- 

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