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34454c761f
The 32bits targets have been compiled with -mfpmath=sse for proper reference.
sbr_sum_square C /32bits: 82c (unrolled)/102c
C /64bits: 69c (unrolled)/82c
SSE/32bits: 42c
SSE/64bits: 31c
Use of SSE4.1 dpps to perform the final sum is slower.
Not unrolling to perform 8 operations in a loop yields 10 more cycles.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
75 lines
2.1 KiB
NASM
75 lines
2.1 KiB
NASM
;******************************************************************************
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;* AAC Spectral Band Replication decoding functions
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;* Copyright (C) 2012 Christophe Gisquet <christophe.gisquet@gmail.com>
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;*
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;* This file is part of Libav.
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;*
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;* Libav is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* Libav is distributed in the hope that it will be useful,
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;* but 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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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with Libav; if not, write to the Free Software
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "x86inc.asm"
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%include "x86util.asm"
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;SECTION_RODATA
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SECTION .text
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INIT_XMM sse
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cglobal sbr_sum_square, 2, 3, 6
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mov r2, r1
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xorps m0, m0
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xorps m1, m1
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sar r2, 3
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jz .prepare
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.loop:
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movu m2, [r0 + 0]
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movu m3, [r0 + 16]
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movu m4, [r0 + 32]
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movu m5, [r0 + 48]
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mulps m2, m2
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mulps m3, m3
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mulps m4, m4
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mulps m5, m5
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addps m0, m2
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addps m1, m3
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addps m0, m4
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addps m1, m5
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add r0, 64
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dec r2
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jnz .loop
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.prepare:
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and r1, 7
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sar r1, 1
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jz .end
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; len is a multiple of 2, thus there are at least 4 elements to process
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.endloop:
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movu m2, [r0]
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add r0, 16
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mulps m2, m2
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dec r1
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addps m0, m2
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jnz .endloop
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.end:
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addps m0, m1
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movhlps m2, m0
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addps m0, m2
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movss m1, m0
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shufps m0, m0, 1
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addss m0, m1
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%if ARCH_X86_64 == 0
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movd r0m, m0
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fld dword r0m
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%endif
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RET
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