ref: a99e5dccaaa1ee8c1b4b519cef1786e8b8678e79
dir: /vp8/common/arm/neon/bilinearpredict8x4_neon.asm/
; ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. ; ; Use of this source code is governed by a BSD-style license ; that can be found in the LICENSE file in the root of the source ; tree. An additional intellectual property rights grant can be found ; in the file PATENTS. All contributing project authors may ; be found in the AUTHORS file in the root of the source tree. ; EXPORT |vp8_bilinear_predict8x4_neon| ARM REQUIRE8 PRESERVE8 AREA ||.text||, CODE, READONLY, ALIGN=2 ; r0 unsigned char *src_ptr, ; r1 int src_pixels_per_line, ; r2 int xoffset, ; r3 int yoffset, ; r4 unsigned char *dst_ptr, ; stack(lr) int dst_pitch |vp8_bilinear_predict8x4_neon| PROC push {r4, lr} ldr r12, _bifilter8x4_coeff_ ldr r4, [sp, #8] ;load parameters from stack ldr lr, [sp, #12] ;load parameters from stack cmp r2, #0 ;skip first_pass filter if xoffset=0 beq skip_firstpass_filter ;First pass: output_height lines x output_width columns (5x8) add r2, r12, r2, lsl #3 ;calculate filter location vld1.u8 {q1}, [r0], r1 ;load src data vld1.u32 {d31}, [r2] ;load first_pass filter vld1.u8 {q2}, [r0], r1 vdup.8 d0, d31[0] ;first_pass filter (d0 d1) vld1.u8 {q3}, [r0], r1 vdup.8 d1, d31[4] vld1.u8 {q4}, [r0], r1 vmull.u8 q6, d2, d0 ;(src_ptr[0] * vp8_filter[0]) vld1.u8 {q5}, [r0], r1 vmull.u8 q7, d4, d0 vmull.u8 q8, d6, d0 vmull.u8 q9, d8, d0 vmull.u8 q10, d10, d0 vext.8 d3, d2, d3, #1 ;construct src_ptr[-1] vext.8 d5, d4, d5, #1 vext.8 d7, d6, d7, #1 vext.8 d9, d8, d9, #1 vext.8 d11, d10, d11, #1 vmlal.u8 q6, d3, d1 ;(src_ptr[1] * vp8_filter[1]) vmlal.u8 q7, d5, d1 vmlal.u8 q8, d7, d1 vmlal.u8 q9, d9, d1 vmlal.u8 q10, d11, d1 vqrshrn.u16 d22, q6, #7 ;shift/round/saturate to u8 vqrshrn.u16 d23, q7, #7 vqrshrn.u16 d24, q8, #7 vqrshrn.u16 d25, q9, #7 vqrshrn.u16 d26, q10, #7 ;Second pass: 4x8 secondpass_filter cmp r3, #0 ;skip second_pass filter if yoffset=0 beq skip_secondpass_filter add r3, r12, r3, lsl #3 add r0, r4, lr vld1.u32 {d31}, [r3] ;load second_pass filter add r1, r0, lr vdup.8 d0, d31[0] ;second_pass filter parameters (d0 d1) vdup.8 d1, d31[4] vmull.u8 q1, d22, d0 ;(src_ptr[0] * vp8_filter[0]) vmull.u8 q2, d23, d0 vmull.u8 q3, d24, d0 vmull.u8 q4, d25, d0 vmlal.u8 q1, d23, d1 ;(src_ptr[pixel_step] * vp8_filter[1]) vmlal.u8 q2, d24, d1 vmlal.u8 q3, d25, d1 vmlal.u8 q4, d26, d1 add r2, r1, lr vqrshrn.u16 d2, q1, #7 ;shift/round/saturate to u8 vqrshrn.u16 d3, q2, #7 vqrshrn.u16 d4, q3, #7 vqrshrn.u16 d5, q4, #7 vst1.u8 {d2}, [r4] ;store result vst1.u8 {d3}, [r0] vst1.u8 {d4}, [r1] vst1.u8 {d5}, [r2] pop {r4, pc} ;-------------------- skip_firstpass_filter vld1.u8 {d22}, [r0], r1 ;load src data vld1.u8 {d23}, [r0], r1 vld1.u8 {d24}, [r0], r1 vld1.u8 {d25}, [r0], r1 vld1.u8 {d26}, [r0], r1 b secondpass_filter ;--------------------- skip_secondpass_filter vst1.u8 {d22}, [r4], lr ;store result vst1.u8 {d23}, [r4], lr vst1.u8 {d24}, [r4], lr vst1.u8 {d25}, [r4], lr pop {r4, pc} ENDP ;----------------- _bifilter8x4_coeff_ DCD bifilter8x4_coeff bifilter8x4_coeff DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112 END