From 1f617ea9ec74956688a30da3901905c9abe34a65 Mon Sep 17 00:00:00 2001 From: Siarhei Siamashka Date: Mon, 14 Mar 2011 15:17:31 -0300 Subject: sbc: MMX optimization for scale factors calculation Improves SBC encoding performance when joint stereo is not used. Benchmarked on Pentium-M: == Before: == $ time ./sbcenc -b53 -s8 test.au > /dev/null real 0m1.439s user 0m1.336s sys 0m0.104s samples % image name symbol name 8642 33.7473 sbcenc sbc_pack_frame 5873 22.9342 sbcenc sbc_analyze_4b_8s_mmx 4435 17.3188 sbcenc sbc_calc_scalefactors 4285 16.7331 sbcenc sbc_calculate_bits 1942 7.5836 sbcenc sbc_enc_process_input_8s_be 322 1.2574 sbcenc sbc_encode == After: == $ time ./sbcenc -b53 -s8 test.au > /dev/null real 0m1.319s user 0m1.220s sys 0m0.084s samples % image name symbol name 8706 37.9959 sbcenc sbc_pack_frame 5740 25.0513 sbcenc sbc_analyze_4b_8s_mmx 4307 18.7972 sbcenc sbc_calculate_bits 1937 8.4537 sbcenc sbc_enc_process_input_8s_be 1801 7.8602 sbcenc sbc_calc_scalefactors_mmx 307 1.3399 sbcenc sbc_encode --- src/modules/bluetooth/sbc/sbc_primitives_mmx.c | 54 ++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) (limited to 'src/modules/bluetooth/sbc') diff --git a/src/modules/bluetooth/sbc/sbc_primitives_mmx.c b/src/modules/bluetooth/sbc/sbc_primitives_mmx.c index 08e9ca28..d8373b3a 100644 --- a/src/modules/bluetooth/sbc/sbc_primitives_mmx.c +++ b/src/modules/bluetooth/sbc/sbc_primitives_mmx.c @@ -275,6 +275,59 @@ static inline void sbc_analyze_4b_8s_mmx(int16_t *x, int32_t *out, asm volatile ("emms\n"); } +static void sbc_calc_scalefactors_mmx( + int32_t sb_sample_f[16][2][8], + uint32_t scale_factor[2][8], + int blocks, int channels, int subbands) +{ + static const SBC_ALIGNED int32_t consts[2] = { + 1 << SCALE_OUT_BITS, + 1 << SCALE_OUT_BITS, + }; + int ch, sb; + intptr_t blk; + for (ch = 0; ch < channels; ch++) { + for (sb = 0; sb < subbands; sb += 2) { + blk = (blocks - 1) * (((char *) &sb_sample_f[1][0][0] - + (char *) &sb_sample_f[0][0][0])); + asm volatile ( + "movq (%4), %%mm0\n" + "1:\n" + "movq (%1, %0), %%mm1\n" + "pxor %%mm2, %%mm2\n" + "pcmpgtd %%mm2, %%mm1\n" + "paddd (%1, %0), %%mm1\n" + "pcmpgtd %%mm1, %%mm2\n" + "pxor %%mm2, %%mm1\n" + + "por %%mm1, %%mm0\n" + + "sub %2, %0\n" + "jns 1b\n" + + "movd %%mm0, %k0\n" + "psrlq $32, %%mm0\n" + "bsrl %k0, %k0\n" + "subl %5, %k0\n" + "movl %k0, (%3)\n" + + "movd %%mm0, %k0\n" + "bsrl %k0, %k0\n" + "subl %5, %k0\n" + "movl %k0, 4(%3)\n" + : "+r" (blk) + : "r" (&sb_sample_f[0][ch][sb]), + "i" ((char *) &sb_sample_f[1][0][0] - + (char *) &sb_sample_f[0][0][0]), + "r" (&scale_factor[ch][sb]), + "r" (&consts), + "i" (SCALE_OUT_BITS) + : "memory"); + } + } + asm volatile ("emms\n"); +} + static int check_mmx_support(void) { #ifdef __amd64__ @@ -313,6 +366,7 @@ void sbc_init_primitives_mmx(struct sbc_encoder_state *state) if (check_mmx_support()) { state->sbc_analyze_4b_4s = sbc_analyze_4b_4s_mmx; state->sbc_analyze_4b_8s = sbc_analyze_4b_8s_mmx; + state->sbc_calc_scalefactors = sbc_calc_scalefactors_mmx; state->implementation_info = "MMX"; } } -- cgit