x86: lossless audio: SSE4 madd 32bits

The unique user so far is wmalossless 24bits. The few samples tested show an
order of 8, so more unrolling or an avx2 version do not make sense.

Timings: 68 -> 49 cycles

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/x86/lossless_audiodsp.asm

@@ -68,6 +68,39 @@ SCALARPRODUCT
 INIT_XMM sse2
 SCALARPRODUCT
 
+INIT_XMM sse4
+; int ff_scalarproduct_and_madd_int32(int16_t *v1, int32_t *v2, int16_t *v3,
+;                                     int order, int mul)
+cglobal scalarproduct_and_madd_int32, 4,4,8, v1, v2, v3, order, mul
+    shl orderq, 1
+    movd    m7, mulm
+    SPLATW  m7, m7
+    pxor    m6, m6
+    add v1q, orderq
+    lea v2q, [v2q + 2*orderq]
+    add v3q, orderq
+    neg orderq
+.loop:
+    mova    m3, [v1q + orderq]
+    movu    m0, [v2q + 2*orderq]
+    pmovsxwd m4, m3
+    movu    m1, [v2q + 2*orderq + mmsize]
+    movhlps m5, m3
+    movu    m2, [v3q + orderq]
+    pmovsxwd m5, m5
+    pmullw  m2, m7
+    pmulld  m0, m4
+    pmulld  m1, m5
+    paddw   m2, m3
+    paddd   m6, m0
+    paddd   m6, m1
+    mova    [v1q + orderq], m2
+    add     orderq, 16
+    jl .loop
+    HADDD   m6, m0
+    movd   eax, m6
+    RET
+
 %macro SCALARPRODUCT_LOOP 1
 align 16
 .loop%1:

libavcodec/x86/lossless_audiodsp_init.c

@@ -31,6 +31,10 @@ int32_t ff_scalarproduct_and_madd_int16_ssse3(int16_t *v1, const int16_t *v2,
                                               const int16_t *v3,
                                               int order, int mul);
 
+int32_t ff_scalarproduct_and_madd_int32_sse4(int16_t *v1, const int32_t *v2,
+                                             const int16_t *v3,
+                                             int order, int mul);
+
 av_cold void ff_llauddsp_init_x86(LLAudDSPContext *c)
 {
 #if HAVE_YASM
@@ -45,5 +49,8 @@ av_cold void ff_llauddsp_init_x86(LLAudDSPContext *c)
     if (EXTERNAL_SSSE3(cpu_flags) &&
         !(cpu_flags & (AV_CPU_FLAG_SSE42 | AV_CPU_FLAG_3DNOW))) // cachesplit
         c->scalarproduct_and_madd_int16 = ff_scalarproduct_and_madd_int16_ssse3;
+
+    if (EXTERNAL_SSE4(cpu_flags))
+        c->scalarproduct_and_madd_int32 = ff_scalarproduct_and_madd_int32_sse4;
 #endif
 }