140 lines
4.4 KiB
NASM
140 lines
4.4 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_bilinear_predict8x4_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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; r0 unsigned char *src_ptr,
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; r1 int src_pixels_per_line,
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; r2 int xoffset,
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; r3 int yoffset,
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; r4 unsigned char *dst_ptr,
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; stack(lr) int dst_pitch
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|vp8_bilinear_predict8x4_neon| PROC
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push {r4, lr}
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ldr r12, _bifilter8x4_coeff_
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ldr r4, [sp, #8] ;load parameters from stack
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ldr lr, [sp, #12] ;load parameters from stack
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cmp r2, #0 ;skip first_pass filter if xoffset=0
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beq skip_firstpass_filter
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;First pass: output_height lines x output_width columns (5x8)
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add r2, r12, r2, lsl #3 ;calculate filter location
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vld1.u8 {q1}, [r0], r1 ;load src data
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vld1.u32 {d31}, [r2] ;load first_pass filter
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vld1.u8 {q2}, [r0], r1
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vdup.8 d0, d31[0] ;first_pass filter (d0 d1)
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vld1.u8 {q3}, [r0], r1
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vdup.8 d1, d31[4]
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vld1.u8 {q4}, [r0], r1
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vmull.u8 q6, d2, d0 ;(src_ptr[0] * vp8_filter[0])
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vld1.u8 {q5}, [r0], r1
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vmull.u8 q7, d4, d0
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vmull.u8 q8, d6, d0
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vmull.u8 q9, d8, d0
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vmull.u8 q10, d10, d0
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vext.8 d3, d2, d3, #1 ;construct src_ptr[-1]
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vext.8 d5, d4, d5, #1
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vext.8 d7, d6, d7, #1
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vext.8 d9, d8, d9, #1
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vext.8 d11, d10, d11, #1
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vmlal.u8 q6, d3, d1 ;(src_ptr[1] * vp8_filter[1])
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vmlal.u8 q7, d5, d1
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vmlal.u8 q8, d7, d1
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vmlal.u8 q9, d9, d1
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vmlal.u8 q10, d11, d1
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vqrshrn.u16 d22, q6, #7 ;shift/round/saturate to u8
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vqrshrn.u16 d23, q7, #7
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vqrshrn.u16 d24, q8, #7
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vqrshrn.u16 d25, q9, #7
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vqrshrn.u16 d26, q10, #7
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;Second pass: 4x8
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secondpass_filter
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cmp r3, #0 ;skip second_pass filter if yoffset=0
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beq skip_secondpass_filter
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add r3, r12, r3, lsl #3
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add r0, r4, lr
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vld1.u32 {d31}, [r3] ;load second_pass filter
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add r1, r0, lr
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vdup.8 d0, d31[0] ;second_pass filter parameters (d0 d1)
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vdup.8 d1, d31[4]
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vmull.u8 q1, d22, d0 ;(src_ptr[0] * vp8_filter[0])
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vmull.u8 q2, d23, d0
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vmull.u8 q3, d24, d0
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vmull.u8 q4, d25, d0
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vmlal.u8 q1, d23, d1 ;(src_ptr[pixel_step] * vp8_filter[1])
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vmlal.u8 q2, d24, d1
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vmlal.u8 q3, d25, d1
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vmlal.u8 q4, d26, d1
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add r2, r1, lr
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vqrshrn.u16 d2, q1, #7 ;shift/round/saturate to u8
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vqrshrn.u16 d3, q2, #7
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vqrshrn.u16 d4, q3, #7
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vqrshrn.u16 d5, q4, #7
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vst1.u8 {d2}, [r4] ;store result
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vst1.u8 {d3}, [r0]
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vst1.u8 {d4}, [r1]
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vst1.u8 {d5}, [r2]
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pop {r4, pc}
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;--------------------
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skip_firstpass_filter
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vld1.u8 {d22}, [r0], r1 ;load src data
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vld1.u8 {d23}, [r0], r1
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vld1.u8 {d24}, [r0], r1
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vld1.u8 {d25}, [r0], r1
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vld1.u8 {d26}, [r0], r1
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b secondpass_filter
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;---------------------
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skip_secondpass_filter
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vst1.u8 {d22}, [r4], lr ;store result
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vst1.u8 {d23}, [r4], lr
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vst1.u8 {d24}, [r4], lr
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vst1.u8 {d25}, [r4], lr
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pop {r4, pc}
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ENDP
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;-----------------
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AREA bifilters8x4_dat, DATA, READWRITE ;read/write by default
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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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_bifilter8x4_coeff_
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DCD bifilter8x4_coeff
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bifilter8x4_coeff
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DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112
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END
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