av_cold void ff_fft_init_x86(FFTContext *s) { int cpu_flags = av_get_cpu_flags(); #if ARCH_X86_32 if (EXTERNAL_AMD3DNOW(cpu_flags)) { /* 3DNow! for K6-2/3 */ s->imdct_calc = ff_imdct_calc_3dnow; s->imdct_half = ff_imdct_half_3dnow; s->fft_calc = ff_fft_calc_3dnow; } if (EXTERNAL_AMD3DNOWEXT(cpu_flags)) { /* 3DNowEx for K7 */ s->imdct_calc = ff_imdct_calc_3dnowext; s->imdct_half = ff_imdct_half_3dnowext; s->fft_calc = ff_fft_calc_3dnowext; } #endif if (EXTERNAL_SSE(cpu_flags)) { /* SSE for P3/P4/K8 */ s->imdct_calc = ff_imdct_calc_sse; s->imdct_half = ff_imdct_half_sse; s->fft_permute = ff_fft_permute_sse; s->fft_calc = ff_fft_calc_sse; s->fft_permutation = FF_FFT_PERM_SWAP_LSBS; } if (EXTERNAL_AVX(cpu_flags) && s->nbits >= 5) { /* AVX for SB */ s->imdct_half = ff_imdct_half_avx; s->fft_calc = ff_fft_calc_avx; s->fft_permutation = FF_FFT_PERM_AVX; } }