ed9c66f584
Instead of using the predict buffer, the decoder now writes
the predictor into the recon buffer. For blocks with eob=0,
unnecessary idcts can be eliminated. This gave a performance
boost of ~1.8% for the HD clips used.
Tero: Added needed changes to ARM side and scheduled some
assembly code to prevent interlocks.
Patch Set 6: Merged (I1bcdca7a95aacc3a181b9faa6b10e3a71ee24df3)
into this commit because of similarities in the idct
functions.
Patch Set 7: EC bug fix.
Change-Id: Ie31d90b5d3522e1108163f2ac491e455e3f955e6
140 lines
3.7 KiB
NASM
140 lines
3.7 KiB
NASM
;
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; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp8_short_idct4x4llm_neon|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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;*************************************************************
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;void vp8_short_idct4x4llm_c(short *input, unsigned char *pred, int pitch,
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; unsigned char *dst, int stride)
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;r0 short * input
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;r1 short * pred
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;r2 int pitch
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;r3 unsigned char dst
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;sp int stride
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;*************************************************************
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; static const int cospi8sqrt2minus1=20091;
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; static const int sinpi8sqrt2 =35468;
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; static const int rounding = 0;
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; Optimization note: The resulted data from dequantization are signed
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; 13-bit data that is in the range of [-4096, 4095]. This allows to
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; use "vqdmulh"(neon) instruction since it won't go out of range
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; (13+16+1=30bits<32bits). This instruction gives the high half
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; result of the multiplication that is needed in IDCT.
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|vp8_short_idct4x4llm_neon| PROC
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adr r12, idct_coeff
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vld1.16 {q1, q2}, [r0]
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vld1.16 {d0}, [r12]
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vswp d3, d4 ;q2(vp[4] vp[12])
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ldr r0, [sp] ; stride
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vqdmulh.s16 q3, q2, d0[2]
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vqdmulh.s16 q4, q2, d0[0]
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vqadd.s16 d12, d2, d3 ;a1
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vqsub.s16 d13, d2, d3 ;b1
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vshr.s16 q3, q3, #1
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vshr.s16 q4, q4, #1
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vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number)
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vqadd.s16 q4, q4, q2
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;d6 - c1:temp1
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;d7 - d1:temp2
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;d8 - d1:temp1
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;d9 - c1:temp2
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vqsub.s16 d10, d6, d9 ;c1
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vqadd.s16 d11, d7, d8 ;d1
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vqadd.s16 d2, d12, d11
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vqadd.s16 d3, d13, d10
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vqsub.s16 d4, d13, d10
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vqsub.s16 d5, d12, d11
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vtrn.32 d2, d4
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vtrn.32 d3, d5
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vtrn.16 d2, d3
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vtrn.16 d4, d5
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vswp d3, d4
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vqdmulh.s16 q3, q2, d0[2]
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vqdmulh.s16 q4, q2, d0[0]
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vqadd.s16 d12, d2, d3 ;a1
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vqsub.s16 d13, d2, d3 ;b1
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vshr.s16 q3, q3, #1
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vshr.s16 q4, q4, #1
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vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number)
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vqadd.s16 q4, q4, q2
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vqsub.s16 d10, d6, d9 ;c1
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vqadd.s16 d11, d7, d8 ;d1
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vqadd.s16 d2, d12, d11
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vqadd.s16 d3, d13, d10
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vqsub.s16 d4, d13, d10
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vqsub.s16 d5, d12, d11
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vrshr.s16 d2, d2, #3
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vrshr.s16 d3, d3, #3
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vrshr.s16 d4, d4, #3
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vrshr.s16 d5, d5, #3
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vtrn.32 d2, d4
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vtrn.32 d3, d5
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vtrn.16 d2, d3
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vtrn.16 d4, d5
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; load prediction data
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vld1.32 d6[0], [r1], r2
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vld1.32 d6[1], [r1], r2
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vld1.32 d7[0], [r1], r2
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vld1.32 d7[1], [r1], r2
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; add prediction and residual
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vaddw.u8 q1, q1, d6
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vaddw.u8 q2, q2, d7
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vqmovun.s16 d1, q1
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vqmovun.s16 d2, q2
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; store to destination
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vst1.32 d1[0], [r3], r0
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vst1.32 d1[1], [r3], r0
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vst1.32 d2[0], [r3], r0
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vst1.32 d2[1], [r3], r0
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bx lr
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ENDP
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;-----------------
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idct_coeff
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DCD 0x4e7b4e7b, 0x8a8c8a8c
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;20091, 20091, 35468, 35468
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END
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