127 lines
4.6 KiB
NASM
127 lines
4.6 KiB
NASM
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; Copyright (c) 2010 The VP8 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 and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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EXPORT |vp8_fast_fdct4x4_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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;void vp8_fast_fdct4x4_c(short *input, short *output, int pitch);
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;NOTE:
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;The input *src_diff. src_diff is calculated as:
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;diff_ptr[c] = src_ptr[c] - pred_ptr[c]; (in Subtract* function)
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;In which *src_ptr and *pred_ptr both are unsigned char.
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;Therefore, *src_diff should be in the range of [-255, 255].
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;CAUTION:
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;The input values of 25th block are set in vp8_build_dcblock function, which are out of [-255, 255].
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;But, VP8 encoder only uses vp8_short_fdct4x4_c for 25th block, not vp8_fast_fdct4x4_c. That makes
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;it ok for assuming *input in [-255, 255] in vp8_fast_fdct4x4_c, but not ok in vp8_short_fdct4x4_c.
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|vp8_fast_fdct4x4_neon| PROC
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vld1.16 {d2}, [r0], r2 ;load input
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ldr r12, _ffdct_coeff_
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vld1.16 {d3}, [r0], r2
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vld1.16 {d4}, [r0], r2
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vld1.16 {d0}, [r12]
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vld1.16 {d5}, [r0], r2
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;First for-loop
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;transpose d2, d3, d4, d5. Then, d2=ip[0], d3=ip[1], d4=ip[2], d5=ip[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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vadd.s16 d6, d2, d5 ;ip[0]+ip[3]
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vadd.s16 d7, d3, d4 ;ip[1]+ip[2]
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vsub.s16 d8, d3, d4 ;ip[1]-ip[2]
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vsub.s16 d9, d2, d5 ;ip[0]-ip[3]
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vshl.i16 q3, q3, #1 ; a1, b1
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vshl.i16 q4, q4, #1 ; c1, d1
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vadd.s16 d10, d6, d7 ;temp1 = a1 + b1
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vsub.s16 d11, d6, d7 ;temp2 = a1 - b1
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vqdmulh.s16 q6, q5, d0[1]
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vqdmulh.s16 q8, q4, d0[0]
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vqdmulh.s16 q7, q4, d0[2]
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vshr.s16 q6, q6, #1
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vshr.s16 q8, q8, #1
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vshr.s16 q7, q7, #1 ;d14:temp1 = ( c1 * x_c3)>>16; d15:temp1 = (d1 * x_c3)>>16
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vadd.s16 q8, q4, q8 ;d16:temp2 = ((c1 * x_c1)>>16) + c1; d17:temp2 = ((d1 * x_c1)>>16) + d1
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vadd.s16 d2, d10, d12 ;op[0] = ((temp1 * x_c2 )>>16) + temp1
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vadd.s16 d4, d11, d13 ;op[2] = ((temp2 * x_c2 )>>16) + temp2
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vadd.s16 d3, d14, d17 ;op[1] = temp1 + temp2 -- q is not necessary, just for protection
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vsub.s16 d5, d15, d16 ;op[3] = temp1 - temp2
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;Second for-loop
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;transpose d2, d3, d4, d5. Then, d2=ip[0], d3=ip[4], d4=ip[8], d5=ip[12]
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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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vadd.s16 d6, d2, d5 ;a1 = ip[0]+ip[12]
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vadd.s16 d7, d3, d4 ;b1 = ip[4]+ip[8]
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vsub.s16 d8, d3, d4 ;c1 = ip[4]-ip[8]
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vsub.s16 d9, d2, d5 ;d1 = ip[0]-ip[12]
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vadd.s16 d10, d6, d7 ;temp1 = a1 + b1
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vsub.s16 d11, d6, d7 ;temp2 = a1 - b1
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vqdmulh.s16 q6, q5, d0[1]
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vqdmulh.s16 q8, q4, d0[0]
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vqdmulh.s16 q7, q4, d0[2]
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vshr.s16 q6, q6, #1
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vshr.s16 q8, q8, #1
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vshr.s16 q7, q7, #1 ;d14:temp1 = ( c1 * x_c3)>>16; d15:temp1 = (d1 * x_c3)>>16
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vadd.s16 q8, q4, q8 ;d16:temp2 = ((c1 * x_c1)>>16) + c1; d17:temp2 = ((d1 * x_c1)>>16) + d1
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vadd.s16 d2, d10, d12 ;a2 = ((temp1 * x_c2 )>>16) + temp1
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vadd.s16 d4, d11, d13 ;c2 = ((temp2 * x_c2 )>>16) + temp2
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vadd.s16 d3, d14, d17 ;b2 = temp1 + temp2 -- q is not necessary, just for protection
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vsub.s16 d5, d15, d16 ;d2 = temp1 - temp2
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vclt.s16 q3, q1, #0
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vclt.s16 q4, q2, #0
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vsub.s16 q1, q1, q3
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vsub.s16 q2, q2, q4
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vshr.s16 q1, q1, #1
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vshr.s16 q2, q2, #1
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vst1.16 {q1, q2}, [r1]
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bx lr
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ENDP
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;-----------------
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AREA fastfdct_dat, DATA, READONLY
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;Data section with name data_area is specified. DCD reserves space in memory for 48 data.
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;One word each is reserved. Label filter_coeff can be used to access the data.
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;Data address: filter_coeff, filter_coeff+4, filter_coeff+8 ...
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_ffdct_coeff_
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DCD ffdct_coeff
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ffdct_coeff
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; 60547 = 0xEC83
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; 46341 = 0xB505
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; 25080 = 0x61F8
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DCD 0xB505EC83, 0x000061F8
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END
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