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x86: ac3dsp: Remove 3dnow version of ff_ac3_extract_exponents

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The function requires increasing the fuzz factor for the ac3/eac3 encode
tests and even so makes fate fail. It only provides a slight encoding
speedup for legacy CPUs that do not support SS2. Thus its benefit is not
worth the trouble it creates and fixing it would be a waste of time.
This commit is contained in:
Diego Biurrun 2013-04-26 16:48:39 +02:00
parent 74685f6783
commit 7c00e9d8ae
3 changed files with 0 additions and 39 deletions
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36
libavcodec/x86/ac3dsp.asm
View File

@ -379,42 +379,6 @@ cglobal ac3_compute_mantissa_size, 1, 2, 4, mant_cnt, sum
%endif
%endmacro
%if HAVE_AMD3DNOW_EXTERNAL
INIT_MMX 3dnow
cglobal ac3_extract_exponents, 3, 3, 0, exp, coef, len
add expq, lenq
lea coefq, [coefq+4*lenq]
neg lenq
movq m3, [pd_1]
movq m4, [pd_151]
.loop:
movq m0, [coefq+4*lenq ]
movq m1, [coefq+4*lenq+8]
PABSD m0, m2
PABSD m1, m2
pslld m0, 1
por m0, m3
pi2fd m2, m0
psrld m2, 23
movq m0, m4
psubd m0, m2
pslld m1, 1
por m1, m3
pi2fd m2, m1
psrld m2, 23
movq m1, m4
psubd m1, m2
packssdw m0, m0
packuswb m0, m0
packssdw m1, m1
packuswb m1, m1
punpcklwd m0, m1
movd [expq+lenq], m0
add lenq, 4
jl .loop
REP_RET
%endif
%macro AC3_EXTRACT_EXPONENTS 0
cglobal ac3_extract_exponents, 3, 3, 4, exp, coef, len
add expq, lenq

1
libavcodec/x86/ac3dsp_init.c
View File

@ -189,7 +189,6 @@ av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
c->ac3_rshift_int32 = ff_ac3_rshift_int32_mmx;
}
if (EXTERNAL_AMD3DNOW(mm_flags)) {
c->extract_exponents = ff_ac3_extract_exponents_3dnow;
if (!bit_exact) {
c->float_to_fixed24 = ff_float_to_fixed24_3dnow;
}

2
tests/fate/ac3.mak
View File

@ -52,14 +52,12 @@ fate-ac3-encode: CMD = enc_dec_pcm ac3 wav s16le $(REF) -c:a ac3 -b:a 128k
fate-ac3-encode: CMP_SHIFT = -1024
fate-ac3-encode: CMP_TARGET = 404.53
fate-ac3-encode: SIZE_TOLERANCE = 488
fate-ac3-encode: FUZZ = 3
FATE_EAC3-$(call ENCDEC, EAC3, EAC3) += fate-eac3-encode
fate-eac3-encode: CMD = enc_dec_pcm eac3 wav s16le $(REF) -c:a eac3 -b:a 128k
fate-eac3-encode: CMP_SHIFT = -1024
fate-eac3-encode: CMP_TARGET = 516.94
fate-eac3-encode: SIZE_TOLERANCE = 488
fate-eac3-encode: FUZZ = 3
fate-ac3-encode fate-eac3-encode: CMP = stddev
fate-ac3-encode fate-eac3-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav