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4d84a00b49
In the assembly optimized versions of SSE, a noise could occur when the number of channels were 3,5,6 or 7. For MMX and ARM, this could occur when the number of channels were 3. Signed-off-by: David Henningsson <david.henningsson@canonical.com>
321 lines
13 KiB
C
321 lines
13 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <pulse/timeval.h>
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#include <pulse/rtclock.h>
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#include <pulsecore/random.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/g711.h>
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#include <pulsecore/core-util.h>
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#include "cpu-x86.h"
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#include "sample-util.h"
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#include "endianmacros.h"
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#if defined (__i386__) || defined (__amd64__)
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/* in s: 2 int16_t samples
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* in v: 2 int32_t volumes, fixed point 16:16
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* out s: contains scaled and clamped int16_t samples.
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*
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* We calculate the high 32 bits of a 32x16 multiply which we then
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* clamp to 16 bits. The calulcation is:
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*
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* vl = (v & 0xffff)
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* vh = (v >> 16)
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* s = ((s * vl) >> 16) + (s * vh);
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*
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* For the first multiply we have to do a sign correction as we need to
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* multiply a signed int with an unsigned int. Hacker's delight 8-3 gives a
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* simple formula to correct the sign of the high word after the signed
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* multiply.
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*/
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#define VOLUME_32x16(s,v) /* .. | vh | vl | */ \
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" pxor %%mm4, %%mm4 \n\t" /* .. | 0 | 0 | */ \
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" punpcklwd %%mm4, "#s" \n\t" /* .. | 0 | p0 | */ \
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" pcmpgtw "#v", %%mm4 \n\t" /* .. | 0 | s(vl) | */ \
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" pand "#s", %%mm4 \n\t" /* .. | 0 | (p0) | (vl >> 15) & p */ \
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" movq "#s", %%mm5 \n\t" \
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" pmulhw "#v", "#s" \n\t" /* .. | 0 | vl*p0 | */ \
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" paddw %%mm4, "#s" \n\t" /* .. | 0 | vl*p0 | + sign correct */ \
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" pslld $16, "#s" \n\t" /* .. | vl*p0 | 0 | */ \
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" psrld $16, "#v" \n\t" /* .. | 0 | vh | */ \
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" psrad $16, "#s" \n\t" /* .. | vl*p0 | sign extend */ \
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" pmaddwd %%mm5, "#v" \n\t" /* .. | p0 * vh | */ \
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" paddd "#s", "#v" \n\t" /* .. | p0 * v0 | */ \
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" packssdw "#v", "#v" \n\t" /* .. | p1*v1 | p0*v0 | */
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/* approximately advances %3 = (%3 + a) % b. This function requires that
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* a <= b. */
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#define MOD_ADD(a,b) \
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" add "#a", %3 \n\t" \
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" mov %3, %4 \n\t" \
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" sub "#b", %4 \n\t" \
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" cmovae %4, %3 \n\t"
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/* swap 16 bits */
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#define SWAP_16(s) \
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" movq "#s", %%mm4 \n\t" /* .. | h l | */ \
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" psrlw $8, %%mm4 \n\t" /* .. | 0 h | */ \
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" psllw $8, "#s" \n\t" /* .. | l 0 | */ \
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" por %%mm4, "#s" \n\t" /* .. | l h | */
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/* swap 2 registers 16 bits for better pairing */
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#define SWAP_16_2(s1,s2) \
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" movq "#s1", %%mm4 \n\t" /* .. | h l | */ \
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" movq "#s2", %%mm5 \n\t" \
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" psrlw $8, %%mm4 \n\t" /* .. | 0 h | */ \
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" psrlw $8, %%mm5 \n\t" \
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" psllw $8, "#s1" \n\t" /* .. | l 0 | */ \
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" psllw $8, "#s2" \n\t" \
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" por %%mm4, "#s1" \n\t" /* .. | l h | */ \
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" por %%mm5, "#s2" \n\t"
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static void
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pa_volume_s16ne_mmx (int16_t *samples, int32_t *volumes, unsigned channels, unsigned length)
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{
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pa_reg_x86 channel, temp;
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/* Channels must be at least 4, and always a multiple of the original number.
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* This is also the max amount we overread the volume array, which should
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* have enough padding. */
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channels = channels == 3 ? 6 : PA_MAX (4U, channels);
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__asm__ __volatile__ (
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" xor %3, %3 \n\t"
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" sar $1, %2 \n\t" /* length /= sizeof (int16_t) */
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" test $1, %2 \n\t" /* check for odd samples */
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" je 2f \n\t"
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" movd (%1, %3, 4), %%mm0 \n\t" /* | v0h | v0l | */
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" movw (%0), %w4 \n\t" /* .. | p0 | */
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" movd %4, %%mm1 \n\t"
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VOLUME_32x16 (%%mm1, %%mm0)
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" movd %%mm0, %4 \n\t" /* .. | p0*v0 | */
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" movw %w4, (%0) \n\t"
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" add $2, %0 \n\t"
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MOD_ADD ($1, %5)
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"2: \n\t"
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" sar $1, %2 \n\t" /* prepare for processing 2 samples at a time */
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" test $1, %2 \n\t" /* check for odd samples */
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" je 4f \n\t"
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"3: \n\t" /* do samples in groups of 2 */
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" movq (%1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movd (%0), %%mm1 \n\t" /* .. | p1 | p0 | */
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VOLUME_32x16 (%%mm1, %%mm0)
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" movd %%mm0, (%0) \n\t" /* .. | p1*v1 | p0*v0 | */
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" add $4, %0 \n\t"
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MOD_ADD ($2, %5)
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"4: \n\t"
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" sar $1, %2 \n\t" /* prepare for processing 4 samples at a time */
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" cmp $0, %2 \n\t"
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" je 6f \n\t"
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"5: \n\t" /* do samples in groups of 4 */
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" movq (%1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movq 8(%1, %3, 4), %%mm2 \n\t" /* | v3h | v3l | v2h | v2l | */
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" movd (%0), %%mm1 \n\t" /* .. | p1 | p0 | */
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" movd 4(%0), %%mm3 \n\t" /* .. | p3 | p2 | */
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VOLUME_32x16 (%%mm1, %%mm0)
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VOLUME_32x16 (%%mm3, %%mm2)
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" movd %%mm0, (%0) \n\t" /* .. | p1*v1 | p0*v0 | */
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" movd %%mm2, 4(%0) \n\t" /* .. | p3*v3 | p2*v2 | */
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" add $8, %0 \n\t"
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MOD_ADD ($4, %5)
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" dec %2 \n\t"
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" jne 5b \n\t"
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"6: \n\t"
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" emms \n\t"
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: "+r" (samples), "+r" (volumes), "+r" (length), "=D" ((pa_reg_x86)channel), "=&r" (temp)
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: "rm" ((pa_reg_x86)channels)
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: "cc"
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);
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}
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static void
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pa_volume_s16re_mmx (int16_t *samples, int32_t *volumes, unsigned channels, unsigned length)
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{
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pa_reg_x86 channel, temp;
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/* Channels must be at least 4, and always a multiple of the original number.
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* This is also the max amount we overread the volume array, which should
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* have enough padding. */
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channels = channels == 3 ? 6 : PA_MAX (4U, channels);
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__asm__ __volatile__ (
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" xor %3, %3 \n\t"
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" sar $1, %2 \n\t" /* length /= sizeof (int16_t) */
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" pcmpeqw %%mm6, %%mm6 \n\t" /* .. | ffff | ffff | */
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" pcmpeqw %%mm7, %%mm7 \n\t" /* .. | ffff | ffff | */
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" pslld $16, %%mm6 \n\t" /* .. | ffff | 0 | */
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" psrld $31, %%mm7 \n\t" /* .. | 0 | 1 | */
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" test $1, %2 \n\t" /* check for odd samples */
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" je 2f \n\t"
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" movd (%1, %3, 4), %%mm0 \n\t" /* | v0h | v0l | */
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" movw (%0), %w4 \n\t" /* .. | p0 | */
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" rorw $8, %w4 \n\t"
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" movd %4, %%mm1 \n\t"
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VOLUME_32x16 (%%mm1, %%mm0)
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" movd %%mm0, %4 \n\t" /* .. | p0*v0 | */
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" rorw $8, %w4 \n\t"
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" movw %w4, (%0) \n\t"
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" add $2, %0 \n\t"
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MOD_ADD ($1, %5)
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"2: \n\t"
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" sar $1, %2 \n\t" /* prepare for processing 2 samples at a time */
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" test $1, %2 \n\t" /* check for odd samples */
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" je 4f \n\t"
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"3: \n\t" /* do samples in groups of 2 */
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" movq (%1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movd (%0), %%mm1 \n\t" /* .. | p1 | p0 | */
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SWAP_16 (%%mm1)
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VOLUME_32x16 (%%mm1, %%mm0)
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SWAP_16 (%%mm0)
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" movd %%mm0, (%0) \n\t" /* .. | p1*v1 | p0*v0 | */
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" add $4, %0 \n\t"
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MOD_ADD ($2, %5)
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"4: \n\t"
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" sar $1, %2 \n\t" /* prepare for processing 4 samples at a time */
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" cmp $0, %2 \n\t"
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" je 6f \n\t"
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"5: \n\t" /* do samples in groups of 4 */
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" movq (%1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movq 8(%1, %3, 4), %%mm2 \n\t" /* | v3h | v3l | v2h | v2l | */
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" movd (%0), %%mm1 \n\t" /* .. | p1 | p0 | */
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" movd 4(%0), %%mm3 \n\t" /* .. | p3 | p2 | */
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SWAP_16_2 (%%mm1, %%mm3)
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VOLUME_32x16 (%%mm1, %%mm0)
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VOLUME_32x16 (%%mm3, %%mm2)
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SWAP_16_2 (%%mm0, %%mm2)
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" movd %%mm0, (%0) \n\t" /* .. | p1*v1 | p0*v0 | */
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" movd %%mm2, 4(%0) \n\t" /* .. | p3*v3 | p2*v2 | */
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" add $8, %0 \n\t"
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MOD_ADD ($4, %5)
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" dec %2 \n\t"
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" jne 5b \n\t"
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"6: \n\t"
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" emms \n\t"
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: "+r" (samples), "+r" (volumes), "+r" (length), "=D" ((pa_reg_x86)channel), "=&r" (temp)
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: "rm" ((pa_reg_x86)channels)
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: "cc"
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);
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}
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#undef RUN_TEST
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#ifdef RUN_TEST
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#define CHANNELS 2
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#define SAMPLES 1021
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#define TIMES 1000
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#define PADDING 16
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static void run_test (void) {
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int16_t samples[SAMPLES];
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int16_t samples_ref[SAMPLES];
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int16_t samples_orig[SAMPLES];
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int32_t volumes[CHANNELS + PADDING];
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int i, j, padding;
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pa_do_volume_func_t func;
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pa_usec_t start, stop;
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func = pa_get_volume_func (PA_SAMPLE_S16NE);
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printf ("checking MMX %zd\n", sizeof (samples));
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pa_random (samples, sizeof (samples));
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/* for (i = 0; i < SAMPLES; i++)
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samples[i] = -1; */
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memcpy (samples_ref, samples, sizeof (samples));
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memcpy (samples_orig, samples, sizeof (samples));
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for (i = 0; i < CHANNELS; i++)
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volumes[i] = rand() >> 1;
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/* volumes[i] = 0x0000ffff; */
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for (padding = 0; padding < PADDING; padding++, i++)
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volumes[i] = volumes[padding];
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func (samples_ref, volumes, CHANNELS, sizeof (samples));
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pa_volume_s16ne_mmx (samples, volumes, CHANNELS, sizeof (samples));
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for (i = 0; i < SAMPLES; i++) {
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if (samples[i] != samples_ref[i]) {
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printf ("%d: %04x != %04x (%04x * %08x)\n", i, samples[i], samples_ref[i],
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samples_orig[i], volumes[i % CHANNELS]);
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}
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}
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start = pa_rtclock_now();
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for (j = 0; j < TIMES; j++) {
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memcpy (samples, samples_orig, sizeof (samples));
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pa_volume_s16ne_mmx (samples, volumes, CHANNELS, sizeof (samples));
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}
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stop = pa_rtclock_now();
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pa_log_info("MMX: %llu usec.", (long long unsigned int)(stop - start));
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start = pa_rtclock_now();
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for (j = 0; j < TIMES; j++) {
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memcpy (samples_ref, samples_orig, sizeof (samples));
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func (samples_ref, volumes, CHANNELS, sizeof (samples));
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}
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stop = pa_rtclock_now();
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pa_log_info("ref: %llu usec.", (long long unsigned int)(stop - start));
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pa_assert_se(memcmp(samples_ref, samples, sizeof(samples)) == 0);
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}
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#endif
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#endif /* defined (__i386__) || defined (__amd64__) */
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void pa_volume_func_init_mmx (pa_cpu_x86_flag_t flags) {
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#if defined (__i386__) || defined (__amd64__)
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#ifdef RUN_TEST
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run_test ();
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#endif
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if ((flags & PA_CPU_X86_MMX) && (flags & PA_CPU_X86_CMOV)) {
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pa_log_info("Initialising MMX optimized functions.");
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pa_set_volume_func (PA_SAMPLE_S16NE, (pa_do_volume_func_t) pa_volume_s16ne_mmx);
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pa_set_volume_func (PA_SAMPLE_S16RE, (pa_do_volume_func_t) pa_volume_s16re_mmx);
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}
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#endif /* defined (__i386__) || defined (__amd64__) */
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}
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