[FFmpeg-devel] [PATCH 3/7] x86: sbrdsp: implement SSE qmf_deint_bfly
Christophe Gisquet
christophe.gisquet at gmail.com
Sat Apr 6 12:52:10 CEST 2013
>From 312 to 89/68 (sse/sse2) cycles on Arrandale and Win64.
Sandybridge: 68/47 cycles.
Having a loop counter is a 7 cycle gain.
Unrolling is another 7 cycle gain.
Working in reverse scan is another 6 cycles.
---
libavcodec/x86/sbrdsp.asm | 42 ++++++++++++++++++++++++++++++++++++++++++
libavcodec/x86/sbrdsp_init.c | 4 ++++
2 files changed, 46 insertions(+)
diff --git a/libavcodec/x86/sbrdsp.asm b/libavcodec/x86/sbrdsp.asm
index 1730bcf..65c972e 100644
--- a/libavcodec/x86/sbrdsp.asm
+++ b/libavcodec/x86/sbrdsp.asm
@@ -316,3 +316,45 @@ cglobal sbr_qmf_deint_neg, 2,3,3,v,src,vrev
cmp vq, vrevq
jl .loop
REP_RET
+
+; sbr_qmf_deint_bfly(float *v, const float *src0, const float *src1)
+%macro SBR_QMF_DEINT_BFLY 0
+cglobal sbr_qmf_deint_bfly, 3,5,8, v,src0,src1,vrev,c
+ mov cq, 64*4-2*mmsize
+ lea vrevq, [vq + 64*4]
+.loop:
+ mova m0, [src0q+cq]
+ mova m1, [src1q]
+ mova m4, [src0q+cq+mmsize]
+ mova m5, [src1q+mmsize]
+%if cpuflag(sse2)
+ pshufd m2, m0, q0123
+ pshufd m3, m1, q0123
+ pshufd m6, m4, q0123
+ pshufd m7, m5, q0123
+%else
+ shufps m2, m0, m0, q0123
+ shufps m3, m1, m1, q0123
+ shufps m6, m4, m4, q0123
+ shufps m7, m5, m5, q0123
+%endif
+ addps m5, m2
+ subps m0, m7
+ addps m1, m6
+ subps m4, m3
+ mova [vrevq], m1
+ mova [vrevq+mmsize], m5
+ mova [vq+cq], m0
+ mova [vq+cq+mmsize], m4
+ add src1q, 2*mmsize
+ add vrevq, 2*mmsize
+ sub cq, 2*mmsize
+ jge .loop
+ REP_RET
+%endmacro
+
+INIT_XMM sse
+SBR_QMF_DEINT_BFLY
+
+INIT_XMM sse2
+SBR_QMF_DEINT_BFLY
diff --git a/libavcodec/x86/sbrdsp_init.c b/libavcodec/x86/sbrdsp_init.c
index bc39948..2003129 100644
--- a/libavcodec/x86/sbrdsp_init.c
+++ b/libavcodec/x86/sbrdsp_init.c
@@ -37,6 +37,8 @@ void ff_sbr_neg_odd_64_sse(float *z);
void ff_sbr_qmf_pre_shuffle_sse(float *z);
void ff_sbr_qmf_pre_shuffle_sse2(float *z);
void ff_sbr_qmf_deint_neg_sse(float *v, const float *src);
+void ff_sbr_qmf_deint_bfly_sse(float *v, const float *src0, const float *src1);
+void ff_sbr_qmf_deint_bfly_sse2(float *v, const float *src0, const float *src1);
av_cold void ff_sbrdsp_init_x86(SBRDSPContext *s)
{
@@ -51,9 +53,11 @@ av_cold void ff_sbrdsp_init_x86(SBRDSPContext *s)
s->neg_odd_64 = ff_sbr_neg_odd_64_sse;
s->qmf_pre_shuffle = ff_sbr_qmf_pre_shuffle_sse;
s->qmf_deint_neg = ff_sbr_qmf_deint_neg_sse;
+ s->qmf_deint_bfly = ff_sbr_qmf_deint_bfly_sse;
}
if (EXTERNAL_SSE2(mm_flags)) {
s->qmf_pre_shuffle = ff_sbr_qmf_pre_shuffle_sse2;
+ s->qmf_deint_bfly = ff_sbr_qmf_deint_bfly_sse2;
}
}
--
1.8.0.msysgit.0
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