RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

SBR DSP x86: implement SSE sbr_hf_gen 

Start and end index are multiple of 2, therefore guaranteeing aligned access.
Also, this allows to generate 4 floats per loop, keeping the alignment all
along.

Timing:
- 32 bits: 326c -> 172c
- 64 bits: 323c -> 156c

Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Christophe Gisquet 2012-02-24 22:11:19 +01:00 committed by Diego Biurrun
parent 9a16359c38
commit 2aef3d66c9
2 changed files with 75 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
libavcodec/x86/sbrdsp.asm
View File

@ -21,8 +21,11 @@
%include "libavutil/x86/x86util.asm"
;SECTION_RODATA
SECTION .text
SECTION_RODATA
; mask equivalent for multiply by -1.0 1.0
ps_mask times 2 dd 1<<31, 0
SECTION_TEXT
INIT_XMM sse
cglobal sbr_sum_square, 2, 3, 6
@ -112,3 +115,69 @@ cglobal sbr_hf_g_filt, 5, 6, 5
jnz .loop1
.end:
RET
; static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
; const float alpha0[2], const float alpha1[2],
; float bw, int start, int end)
;
cglobal sbr_hf_gen, 4,4,8, X_high, X_low, alpha0, alpha1, BW, S, E
; load alpha factors
%define bw m0
%if ARCH_X86_64 == 0 || WIN64
movss bw, BWm
%endif
movlps m2, [alpha1q]
movlps m1, [alpha0q]
shufps bw, bw, 0
mulps m2, bw ; (a1[0] a1[1])*bw
mulps m1, bw ; (a0[0] a0[1])*bw = (a2 a3)
mulps m2, bw ; (a1[0] a1[1])*bw*bw = (a0 a1)
mova m3, m1
mova m4, m2
mova m7, [ps_mask]
; Set pointers
%if ARCH_X86_64 == 0 || WIN64
; start and end 6th and 7th args on stack
mov r2d, Sm
mov r3d, Em
%define start r2q
%define end r3q
%else
; BW does not actually occupy a register, so shift by 1
%define start BWq
%define end Sq
%endif
sub start, end ; neg num of loops
lea X_highq, [X_highq + end*2*4]
lea X_lowq, [X_lowq + end*2*4 - 2*2*4]
shl start, 3 ; offset from num loops
mova m0, [X_lowq + start]
movlhps m1, m1 ; (a2 a3 a2 a3)
movlhps m2, m2 ; (a0 a1 a0 a1)
shufps m3, m3, q0101 ; (a3 a2 a3 a2)
shufps m4, m4, q0101 ; (a1 a0 a1 a0)
xorps m3, m7 ; (-a3 a2 -a3 a2)
xorps m4, m7 ; (-a1 a0 -a1 a0)
.loop2:
mova m5, m0
mova m6, m0
shufps m0, m0, q2200 ; {Xl[-2][0],",Xl[-1][0],"}
shufps m5, m5, q3311 ; {Xl[-2][1],",Xl[-1][1],"}
mulps m0, m2
mulps m5, m4
mova m7, m6
addps m5, m0
mova m0, [X_lowq + start + 2*2*4]
shufps m6, m0, q0022 ; {Xl[-1][0],",Xl[0][0],"}
shufps m7, m0, q1133 ; {Xl[-1][1],",Xl[1][1],"}
mulps m6, m1
mulps m7, m3
addps m5, m6
addps m7, m0
addps m5, m7
mova [X_highq + start], m5
add start, 16
jnz .loop2
RET

4
libavcodec/x86/sbrdsp_init.c
View File

@ -27,6 +27,9 @@
float ff_sbr_sum_square_sse(float (*x)[2], int n);
void ff_sbr_hf_g_filt_sse(float (*Y)[2], const float (*X_high)[40][2],
const float *g_filt, int m_max, intptr_t ixh);
void ff_sbr_hf_gen_sse(float (*X_high)[2], const float (*X_low)[2],
const float alpha0[2], const float alpha1[2],
float bw, int start, int end);
void ff_sbrdsp_init_x86(SBRDSPContext *s)
{
@ -35,5 +38,6 @@ void ff_sbrdsp_init_x86(SBRDSPContext *s)
if (EXTERNAL_SSE(mm_flags)) {
s->sum_square = ff_sbr_sum_square_sse;
s->hf_g_filt = ff_sbr_hf_g_filt_sse;
s->hf_gen = ff_sbr_hf_gen_sse;
}
}