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e8fe04b2f6
For all our MMX/SSE code, we use a temporary channel variable, assigned to the DI register, which is zero'ed as the very first operation in the inline assembly code, before any other code is run. With GCC 9.1, while using -O2, the DI register is also used for the input operand. This is perfectly legal, but causes our code to become incorrect because the output operand that is assigned to DI is not explicitly marked as being clobbered before inputs are read. This change fixes the problem by adding an earlyclobber annotation (&) to the DI output argument.
252 lines
11 KiB
C
252 lines
11 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, see <http://www.gnu.org/licenses/>.
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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/rtclock.h>
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#include <pulsecore/random.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/endianmacros.h>
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#include "cpu-x86.h"
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#include "sample-util.h"
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#if (!defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && 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 calculation 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 pa_volume_s16ne_mmx(int16_t *samples, const int32_t *volumes, unsigned channels, unsigned length) {
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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 (%q1, %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 (%q1, %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 (%q1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movq 8(%q1, %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" (channel), "=&r" (temp)
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#if defined (__i386__)
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: "m" (channels)
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#else
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: "r" ((pa_reg_x86)channels)
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#endif
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: "cc"
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);
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}
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static void pa_volume_s16re_mmx(int16_t *samples, const int32_t *volumes, unsigned channels, unsigned length) {
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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 (%q1, %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 (%q1, %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 (%q1, %3, 4), %%mm0 \n\t" /* | v1h | v1l | v0h | v0l | */
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" movq 8(%q1, %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" (channel), "=&r" (temp)
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#if defined (__i386__)
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: "m" (channels)
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#else
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: "r" ((pa_reg_x86)channels)
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#endif
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: "cc"
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);
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}
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#endif /* (!defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && 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(__APPLE__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && defined (__i386__)) || defined (__amd64__)
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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 volume 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(__APPLE__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) && defined (__i386__)) || defined (__amd64__) */
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}
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