x86: dcadsp: implement SSE lfe_dir

Results for Arrandale/Windows:
32: 1670 -> 316
64:  728 -> 298
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

libavcodec/x86/dcadsp.asm

@@ -88,3 +88,90 @@ INT8X8_FMUL_INT32
 
 INIT_XMM sse4
 INT8X8_FMUL_INT32
+
+; %1=v0/v1  %2=in1  %3=in2
+%macro FIR_LOOP 2-3
+.loop%1:
+%define va          m1
+%define vb          m2
+%if %1
+%define OFFSET      0
+%else
+%define OFFSET      NUM_COEF*count
+%endif
+; for v0, incrementing and for v1, decrementing
+    mova        va, [cf0q + OFFSET]
+    mova        vb, [cf0q + OFFSET + 4*NUM_COEF]
+%if %0 == 3
+    mova        m4, [cf0q + OFFSET + mmsize]
+    mova        m0, [cf0q + OFFSET + 4*NUM_COEF + mmsize]
+%endif
+    mulps       va, %2
+    mulps       vb, %2
+%if %0 == 3
+    mulps       m4, %3
+    mulps       m0, %3
+    addps       va, m4
+    addps       vb, m0
+%endif
+    ; va = va1 va2 va3 va4
+    ; vb = vb1 vb2 vb3 vb4
+%if %1
+    SWAP        va, vb
+%endif
+    mova        m4, va
+    unpcklps    va, vb ; va3 vb3 va4 vb4
+    unpckhps    m4, vb ; va1 vb1 va2 vb2
+    addps       m4, va ; va1+3 vb1+3 va2+4 vb2+4
+    movhlps     vb, m4 ; va1+3  vb1+3
+    addps       vb, m4 ; va0..4 vb0..4
+    movh    [outq + count], vb
+%if %1
+    sub       cf0q, 8*NUM_COEF
+%endif
+    add      count, 8
+    jl   .loop%1
+%endmacro
+
+; void dca_lfe_fir(float *out, float *in, float *coefs)
+%macro DCA_LFE_FIR 1
+cglobal dca_lfe_fir%1, 3,3,6-%1, out, in, cf0
+%define IN1       m3
+%define IN2       m5
+%define count     inq
+%define NUM_COEF  4*(2-%1)
+%define NUM_OUT   32*(%1+1)
+
+    movu     IN1, [inq + 4 - 1*mmsize]
+    shufps   IN1, IN1, q0123
+%if %1 == 0
+    movu     IN2, [inq + 4 - 2*mmsize]
+    shufps   IN2, IN2, q0123
+%endif
+
+    mov    count, -4*NUM_OUT
+    add     cf0q, 4*NUM_COEF*NUM_OUT
+    add     outq, 4*NUM_OUT
+    ; compute v0 first
+%if %1 == 0
+    FIR_LOOP   0, IN1, IN2
+%else
+    FIR_LOOP   0, IN1
+%endif
+    shufps   IN1, IN1, q0123
+    mov    count, -4*NUM_OUT
+    ; cf1 already correctly positioned
+    add     outq, 4*NUM_OUT          ; outq now at out2
+    sub     cf0q, 8*NUM_COEF
+%if %1 == 0
+    shufps   IN2, IN2, q0123
+    FIR_LOOP   1, IN2, IN1
+%else
+    FIR_LOOP   1, IN1
+%endif
+    RET
+%endmacro
+
+INIT_XMM sse
+DCA_LFE_FIR 0
+DCA_LFE_FIR 1

libavcodec/x86/dcadsp_init.c

@@ -26,6 +26,8 @@
 void ff_int8x8_fmul_int32_sse(float *dst, const int8_t *src, int scale);
 void ff_int8x8_fmul_int32_sse2(float *dst, const int8_t *src, int scale);
 void ff_int8x8_fmul_int32_sse4(float *dst, const int8_t *src, int scale);
+void ff_dca_lfe_fir0_sse(float *out, const float *in, const float *coefs);
+void ff_dca_lfe_fir1_sse(float *out, const float *in, const float *coefs);
 
 av_cold void ff_dcadsp_init_x86(DCADSPContext *s)
 {
@@ -35,6 +37,8 @@ av_cold void ff_dcadsp_init_x86(DCADSPContext *s)
 #if ARCH_X86_32
         s->int8x8_fmul_int32 = ff_int8x8_fmul_int32_sse;
 #endif
+        s->lfe_fir[0]        = ff_dca_lfe_fir0_sse;
+        s->lfe_fir[1]        = ff_dca_lfe_fir1_sse;
     }
 
     if (EXTERNAL_SSE2(cpu_flags)) {