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FFmpeg/libavcodec/x86/ac3dsp.asm
James Almer e40ea9f34b x86/ac3dsp: add ff_float_to_fixed24_avx() 
Signed-off-by: James Almer <jamrial@gmail.com>
2023-11-25 21:50:56 -03:00

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NASM
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;*****************************************************************************
;* x86-optimized AC-3 DSP functions
;* Copyright (c) 2011 Justin Ruggles
;*
;* This file is part of FFmpeg.
;*
;* FFmpeg is free software; you can redistribute it and/or
;* modify it under the terms of the GNU Lesser General Public
;* License as published by the Free Software Foundation; either
;* version 2.1 of the License, or (at your option) any later version.
;*
;* FFmpeg is distributed in the hope that it will be useful,
;* but WITHOUT ANY WARRANTY; without even the implied warranty of
;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;* Lesser General Public License for more details.
;*
;* You should have received a copy of the GNU Lesser General Public
;* License along with FFmpeg; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;******************************************************************************
%include "libavutil/x86/x86util.asm"
SECTION_RODATA
; 16777216.0f - used in ff_float_to_fixed24()
pf_1_24: times 4 dd 0x4B800000
; used in ff_ac3_compute_mantissa_size()
cextern ac3_bap_bits
pw_bap_mul1: dw 21846, 21846, 0, 32768, 21846, 21846, 0, 32768
pw_bap_mul2: dw 5, 7, 0, 7, 5, 7, 0, 7
; used in ff_ac3_extract_exponents()
cextern pd_1
pd_151: times 4 dd 151
SECTION .text
;-----------------------------------------------------------------------------
; void ff_ac3_exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
;-----------------------------------------------------------------------------
%macro AC3_EXPONENT_MIN 0
cglobal ac3_exponent_min, 3, 4, 2, exp, reuse_blks, expn, offset
shl reuse_blksq, 8
jz .end
LOOP_ALIGN
.nextexp:
mov offsetq, reuse_blksq
mova m0, [expq+offsetq]
sub offsetq, 256
LOOP_ALIGN
.nextblk:
PMINUB m0, [expq+offsetq], m1
sub offsetq, 256
jae .nextblk
mova [expq], m0
add expq, mmsize
sub expnq, mmsize
jg .nextexp
.end:
RET
%endmacro
%define LOOP_ALIGN ALIGN 16
%if HAVE_SSE2_EXTERNAL
INIT_XMM sse2
AC3_EXPONENT_MIN
%endif
%undef LOOP_ALIGN
;-----------------------------------------------------------------------------
; void ff_float_to_fixed24(int32_t *dst, const float *src, unsigned int len)
;-----------------------------------------------------------------------------
INIT_XMM sse2
cglobal float_to_fixed24, 3, 3, 9, dst, src, len
movaps m0, [pf_1_24]
shl lenq, 2
add srcq, lenq
add dstq, lenq
neg lenq
.loop:
movaps m1, [srcq+lenq ]
movaps m2, [srcq+lenq+16 ]
movaps m3, [srcq+lenq+32 ]
movaps m4, [srcq+lenq+48 ]
%ifdef m8
movaps m5, [srcq+lenq+64 ]
movaps m6, [srcq+lenq+80 ]
movaps m7, [srcq+lenq+96 ]
movaps m8, [srcq+lenq+112]
%endif
mulps m1, m0
mulps m2, m0
mulps m3, m0
mulps m4, m0
%ifdef m8
mulps m5, m0
mulps m6, m0
mulps m7, m0
mulps m8, m0
%endif
cvtps2dq m1, m1
cvtps2dq m2, m2
cvtps2dq m3, m3
cvtps2dq m4, m4
%ifdef m8
cvtps2dq m5, m5
cvtps2dq m6, m6
cvtps2dq m7, m7
cvtps2dq m8, m8
%endif
movdqa [dstq+lenq ], m1
movdqa [dstq+lenq+16 ], m2
movdqa [dstq+lenq+32 ], m3
movdqa [dstq+lenq+48 ], m4
%ifdef m8
movdqa [dstq+lenq+64 ], m5
movdqa [dstq+lenq+80 ], m6
movdqa [dstq+lenq+96 ], m7
movdqa [dstq+lenq+112], m8
add lenq, 128
%else
add lenq, 64
%endif
jl .loop
RET
INIT_YMM avx
cglobal float_to_fixed24, 3, 3, 5, dst, src, len
vbroadcastf128 m0, [pf_1_24]
shl lenq, 2
add srcq, lenq
add dstq, lenq
neg lenq
.loop:
mulps m1, m0, [srcq+lenq+mmsize*0]
mulps m2, m0, [srcq+lenq+mmsize*1]
mulps m3, m0, [srcq+lenq+mmsize*2]
mulps m4, m0, [srcq+lenq+mmsize*3]
cvtps2dq m1, m1
cvtps2dq m2, m2
cvtps2dq m3, m3
cvtps2dq m4, m4
mova [dstq+lenq+mmsize*0], m1
mova [dstq+lenq+mmsize*1], m2
mova [dstq+lenq+mmsize*2], m3
mova [dstq+lenq+mmsize*3], m4
add lenq, mmsize*4
jl .loop
RET
;------------------------------------------------------------------------------
; int ff_ac3_compute_mantissa_size(uint16_t mant_cnt[6][16])
;------------------------------------------------------------------------------
%macro PHADDD4 2 ; xmm src, xmm tmp
movhlps %2, %1
paddd %1, %2
pshufd %2, %1, 0x1
paddd %1, %2
%endmacro
INIT_XMM sse2
cglobal ac3_compute_mantissa_size, 1, 2, 4, mant_cnt, sum
movdqa m0, [mant_cntq ]
movdqa m1, [mant_cntq+ 1*16]
paddw m0, [mant_cntq+ 2*16]
paddw m1, [mant_cntq+ 3*16]
paddw m0, [mant_cntq+ 4*16]
paddw m1, [mant_cntq+ 5*16]
paddw m0, [mant_cntq+ 6*16]
paddw m1, [mant_cntq+ 7*16]
paddw m0, [mant_cntq+ 8*16]
paddw m1, [mant_cntq+ 9*16]
paddw m0, [mant_cntq+10*16]
paddw m1, [mant_cntq+11*16]
pmaddwd m0, [ac3_bap_bits ]
pmaddwd m1, [ac3_bap_bits+16]
paddd m0, m1
PHADDD4 m0, m1
movd sumd, m0
movdqa m3, [pw_bap_mul1]
movhpd m0, [mant_cntq +2]
movlpd m0, [mant_cntq+1*32+2]
movhpd m1, [mant_cntq+2*32+2]
movlpd m1, [mant_cntq+3*32+2]
movhpd m2, [mant_cntq+4*32+2]
movlpd m2, [mant_cntq+5*32+2]
pmulhuw m0, m3
pmulhuw m1, m3
pmulhuw m2, m3
paddusw m0, m1
paddusw m0, m2
pmaddwd m0, [pw_bap_mul2]
PHADDD4 m0, m1
movd eax, m0
add eax, sumd
RET
;------------------------------------------------------------------------------
; void ff_ac3_extract_exponents(uint8_t *exp, int32_t *coef, int nb_coefs)
;------------------------------------------------------------------------------
%macro PABSD 1-2 ; src/dst, unused
%if cpuflag(ssse3)
pabsd %1, %1
%else ; src/dst, tmp
pxor %2, %2
pcmpgtd %2, %1
pxor %1, %2
psubd %1, %2
%endif
%endmacro
%macro AC3_EXTRACT_EXPONENTS 0
cglobal ac3_extract_exponents, 3, 3, 4, exp, coef, len
add expq, lenq
lea coefq, [coefq+4*lenq]
neg lenq
mova m2, [pd_1]
mova m3, [pd_151]
.loop:
; move 4 32-bit coefs to xmm0
mova m0, [coefq+4*lenq]
; absolute value
PABSD m0, m1
; convert to float and extract exponents
pslld m0, 1
por m0, m2
cvtdq2ps m1, m0
psrld m1, 23
mova m0, m3
psubd m0, m1
; move the lowest byte in each of 4 dwords to the low dword
; NOTE: We cannot just extract the low bytes with pshufb because the dword
; result for 16777215 is -1 due to float inaccuracy. Using packuswb
; clips this to 0, which is the correct exponent.
packssdw m0, m0
packuswb m0, m0
movd [expq+lenq], m0
add lenq, 4
jl .loop
RET
%endmacro
%if HAVE_SSE2_EXTERNAL
INIT_XMM sse2
AC3_EXTRACT_EXPONENTS
%endif
%if HAVE_SSSE3_EXTERNAL
INIT_XMM ssse3
AC3_EXTRACT_EXPONENTS
%endif
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