x86/af_afir: add ff_fcmul_add_avx()

fcmul_add_c: 1228.8
fcmul_add_sse3: 334.3
fcmul_add_avx: 186.3

Tested on a Core i5 4460 @ 3.2GHz
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavfilter/x86/af_afir.asm

@@ -27,7 +27,7 @@ SECTION .text
 ; void ff_fcmul_add(float *sum, const float *t, const float *c, int len)
 ;------------------------------------------------------------------------------
 
-INIT_XMM sse3
+%macro FCMUL_ADD 0
 cglobal fcmul_add, 4,4,6, sum, t, c, len
     shl       lend, 3
     add         tq, lenq
@@ -61,3 +61,9 @@ ALIGN 16
     addss xm0, [sumq + lenq]
     movss [sumq + lenq], xm0
     RET
+%endmacro
+
+INIT_XMM sse3
+FCMUL_ADD
+INIT_YMM avx
+FCMUL_ADD

libavfilter/x86/af_afir_init.c

@@ -24,6 +24,8 @@
 
 void ff_fcmul_add_sse3(float *sum, const float *t, const float *c,
                        ptrdiff_t len);
+void ff_fcmul_add_avx(float *sum, const float *t, const float *c,
+                      ptrdiff_t len);
 
 av_cold void ff_afir_init_x86(AudioFIRDSPContext *s)
 {
@@ -32,4 +34,7 @@ av_cold void ff_afir_init_x86(AudioFIRDSPContext *s)
     if (EXTERNAL_SSE3(cpu_flags)) {
         s->fcmul_add = ff_fcmul_add_sse3;
     }
+    if (EXTERNAL_AVX_FAST(cpu_flags)) {
+        s->fcmul_add = ff_fcmul_add_avx;
+    }
 }