Performance optimizations for input data processing in SBC encoder

Channels deinterleaving, endian conversion and samples reordering
is done in one pass, avoiding the use of intermediate buffer. Also
this code is implemented as a new "performance primitive", which
allows further platform specific optimizations (ARMv6 and ARM NEON
should gain quite a lot from assembly optimizations here).

1 files changed, 4 insertions, 58 deletions

diff --git a/sbc/sbc_primitives_mmx.c b/sbc/sbc_primitives_mmx.c
index 972e813e..7db4af72 100644
--- a/sbc/sbc_primitives_mmx.c
+++ b/sbc/sbc_primitives_mmx.c
@@ -245,28 +245,9 @@ static inline void sbc_analyze_eight_mmx(const int16_t *in, int32_t *out,
 		: "memory");
 }
 
-static inline void sbc_analyze_4b_4s_mmx(int16_t *pcm, int16_t *x,
-						int32_t *out, int out_stride)
+static inline void sbc_analyze_4b_4s_mmx(int16_t *x, int32_t *out,
+						int out_stride)
 {
-	/* Fetch audio samples and do input data reordering for SIMD */
-	x[64] = x[0]  = pcm[8 + 7];
-	x[65] = x[1]  = pcm[8 + 3];
-	x[66] = x[2]  = pcm[8 + 6];
-	x[67] = x[3]  = pcm[8 + 4];
-	x[68] = x[4]  = pcm[8 + 0];
-	x[69] = x[5]  = pcm[8 + 2];
-	x[70] = x[6]  = pcm[8 + 1];
-	x[71] = x[7]  = pcm[8 + 5];
-
-	x[72] = x[8]  = pcm[0 + 7];
-	x[73] = x[9]  = pcm[0 + 3];
-	x[74] = x[10] = pcm[0 + 6];
-	x[75] = x[11] = pcm[0 + 4];
-	x[76] = x[12] = pcm[0 + 0];
-	x[77] = x[13] = pcm[0 + 2];
-	x[78] = x[14] = pcm[0 + 1];
-	x[79] = x[15] = pcm[0 + 5];
-
 	/* Analyze blocks */
 	sbc_analyze_four_mmx(x + 12, out, analysis_consts_fixed4_simd_odd);
 	out += out_stride;
@@ -279,44 +260,9 @@ static inline void sbc_analyze_4b_4s_mmx(int16_t *pcm, int16_t *x,
 	asm volatile ("emms\n");
 }
 
-static inline void sbc_analyze_4b_8s_mmx(int16_t *pcm, int16_t *x,
-						int32_t *out, int out_stride)
+static inline void sbc_analyze_4b_8s_mmx(int16_t *x, int32_t *out,
+						int out_stride)
 {
-	/* Fetch audio samples and do input data reordering for SIMD */
-	x[128] = x[0]  = pcm[16 + 15];
-	x[129] = x[1]  = pcm[16 + 7];
-	x[130] = x[2]  = pcm[16 + 14];
-	x[131] = x[3]  = pcm[16 + 8];
-	x[132] = x[4]  = pcm[16 + 13];
-	x[133] = x[5]  = pcm[16 + 9];
-	x[134] = x[6]  = pcm[16 + 12];
-	x[135] = x[7]  = pcm[16 + 10];
-	x[136] = x[8]  = pcm[16 + 11];
-	x[137] = x[9]  = pcm[16 + 3];
-	x[138] = x[10] = pcm[16 + 6];
-	x[139] = x[11] = pcm[16 + 0];
-	x[140] = x[12] = pcm[16 + 5];
-	x[141] = x[13] = pcm[16 + 1];
-	x[142] = x[14] = pcm[16 + 4];
-	x[143] = x[15] = pcm[16 + 2];
-
-	x[144] = x[16] = pcm[0 + 15];
-	x[145] = x[17] = pcm[0 + 7];
-	x[146] = x[18] = pcm[0 + 14];
-	x[147] = x[19] = pcm[0 + 8];
-	x[148] = x[20] = pcm[0 + 13];
-	x[149] = x[21] = pcm[0 + 9];
-	x[150] = x[22] = pcm[0 + 12];
-	x[151] = x[23] = pcm[0 + 10];
-	x[152] = x[24] = pcm[0 + 11];
-	x[153] = x[25] = pcm[0 + 3];
-	x[154] = x[26] = pcm[0 + 6];
-	x[155] = x[27] = pcm[0 + 0];
-	x[156] = x[28] = pcm[0 + 5];
-	x[157] = x[29] = pcm[0 + 1];
-	x[158] = x[30] = pcm[0 + 4];
-	x[159] = x[31] = pcm[0 + 2];
-
 	/* Analyze blocks */
 	sbc_analyze_eight_mmx(x + 24, out, analysis_consts_fixed8_simd_odd);
 	out += out_stride;