| ; |
| ; Copyright (c) 2013 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 |vpx_lpf_horizontal_4_neon| |
| EXPORT |vpx_lpf_vertical_4_neon| |
| ARM |
| |
| AREA ||.text||, CODE, READONLY, ALIGN=2 |
| |
| ; Currently vpx only works on iterations 8 at a time. The vp8 loop filter |
| ; works on 16 iterations at a time. |
| ; TODO(fgalligan): See about removing the count code as this function is only |
| ; called with a count of 1. |
| ; |
| ; void vpx_lpf_horizontal_4_neon(uint8_t *s, |
| ; int p /* pitch */, |
| ; const uint8_t *blimit, |
| ; const uint8_t *limit, |
| ; const uint8_t *thresh, |
| ; int count) |
| ; |
| ; r0 uint8_t *s, |
| ; r1 int p, /* pitch */ |
| ; r2 const uint8_t *blimit, |
| ; r3 const uint8_t *limit, |
| ; sp const uint8_t *thresh, |
| ; sp+4 int count |
| |vpx_lpf_horizontal_4_neon| PROC |
| push {lr} |
| |
| vld1.8 {d0[]}, [r2] ; duplicate *blimit |
| ldr r12, [sp, #8] ; load count |
| ldr r2, [sp, #4] ; load thresh |
| add r1, r1, r1 ; double pitch |
| |
| cmp r12, #0 |
| beq end_vpx_lf_h_edge |
| |
| vld1.8 {d1[]}, [r3] ; duplicate *limit |
| vld1.8 {d2[]}, [r2] ; duplicate *thresh |
| |
| count_lf_h_loop |
| sub r2, r0, r1, lsl #1 ; move src pointer down by 4 lines |
| add r3, r2, r1, lsr #1 ; set to 3 lines down |
| |
| vld1.u8 {d3}, [r2@64], r1 ; p3 |
| vld1.u8 {d4}, [r3@64], r1 ; p2 |
| vld1.u8 {d5}, [r2@64], r1 ; p1 |
| vld1.u8 {d6}, [r3@64], r1 ; p0 |
| vld1.u8 {d7}, [r2@64], r1 ; q0 |
| vld1.u8 {d16}, [r3@64], r1 ; q1 |
| vld1.u8 {d17}, [r2@64] ; q2 |
| vld1.u8 {d18}, [r3@64] ; q3 |
| |
| sub r2, r2, r1, lsl #1 |
| sub r3, r3, r1, lsl #1 |
| |
| bl vpx_loop_filter_neon |
| |
| vst1.u8 {d4}, [r2@64], r1 ; store op1 |
| vst1.u8 {d5}, [r3@64], r1 ; store op0 |
| vst1.u8 {d6}, [r2@64], r1 ; store oq0 |
| vst1.u8 {d7}, [r3@64], r1 ; store oq1 |
| |
| add r0, r0, #8 |
| subs r12, r12, #1 |
| bne count_lf_h_loop |
| |
| end_vpx_lf_h_edge |
| pop {pc} |
| ENDP ; |vpx_lpf_horizontal_4_neon| |
| |
| ; Currently vpx only works on iterations 8 at a time. The vp8 loop filter |
| ; works on 16 iterations at a time. |
| ; TODO(fgalligan): See about removing the count code as this function is only |
| ; called with a count of 1. |
| ; |
| ; void vpx_lpf_vertical_4_neon(uint8_t *s, |
| ; int p /* pitch */, |
| ; const uint8_t *blimit, |
| ; const uint8_t *limit, |
| ; const uint8_t *thresh, |
| ; int count) |
| ; |
| ; r0 uint8_t *s, |
| ; r1 int p, /* pitch */ |
| ; r2 const uint8_t *blimit, |
| ; r3 const uint8_t *limit, |
| ; sp const uint8_t *thresh, |
| ; sp+4 int count |
| |vpx_lpf_vertical_4_neon| PROC |
| push {lr} |
| |
| vld1.8 {d0[]}, [r2] ; duplicate *blimit |
| ldr r12, [sp, #8] ; load count |
| vld1.8 {d1[]}, [r3] ; duplicate *limit |
| |
| ldr r3, [sp, #4] ; load thresh |
| sub r2, r0, #4 ; move s pointer down by 4 columns |
| cmp r12, #0 |
| beq end_vpx_lf_v_edge |
| |
| vld1.8 {d2[]}, [r3] ; duplicate *thresh |
| |
| count_lf_v_loop |
| vld1.u8 {d3}, [r2], r1 ; load s data |
| vld1.u8 {d4}, [r2], r1 |
| vld1.u8 {d5}, [r2], r1 |
| vld1.u8 {d6}, [r2], r1 |
| vld1.u8 {d7}, [r2], r1 |
| vld1.u8 {d16}, [r2], r1 |
| vld1.u8 {d17}, [r2], r1 |
| vld1.u8 {d18}, [r2] |
| |
| ;transpose to 8x16 matrix |
| vtrn.32 d3, d7 |
| vtrn.32 d4, d16 |
| vtrn.32 d5, d17 |
| vtrn.32 d6, d18 |
| |
| vtrn.16 d3, d5 |
| vtrn.16 d4, d6 |
| vtrn.16 d7, d17 |
| vtrn.16 d16, d18 |
| |
| vtrn.8 d3, d4 |
| vtrn.8 d5, d6 |
| vtrn.8 d7, d16 |
| vtrn.8 d17, d18 |
| |
| bl vpx_loop_filter_neon |
| |
| sub r0, r0, #2 |
| |
| ;store op1, op0, oq0, oq1 |
| vst4.8 {d4[0], d5[0], d6[0], d7[0]}, [r0], r1 |
| vst4.8 {d4[1], d5[1], d6[1], d7[1]}, [r0], r1 |
| vst4.8 {d4[2], d5[2], d6[2], d7[2]}, [r0], r1 |
| vst4.8 {d4[3], d5[3], d6[3], d7[3]}, [r0], r1 |
| vst4.8 {d4[4], d5[4], d6[4], d7[4]}, [r0], r1 |
| vst4.8 {d4[5], d5[5], d6[5], d7[5]}, [r0], r1 |
| vst4.8 {d4[6], d5[6], d6[6], d7[6]}, [r0], r1 |
| vst4.8 {d4[7], d5[7], d6[7], d7[7]}, [r0] |
| |
| add r0, r0, r1, lsl #3 ; s += pitch * 8 |
| subs r12, r12, #1 |
| subne r2, r0, #4 ; move s pointer down by 4 columns |
| bne count_lf_v_loop |
| |
| end_vpx_lf_v_edge |
| pop {pc} |
| ENDP ; |vpx_lpf_vertical_4_neon| |
| |
| ; void vpx_loop_filter_neon(); |
| ; This is a helper function for the loopfilters. The invidual functions do the |
| ; necessary load, transpose (if necessary) and store. The function does not use |
| ; registers d8-d15. |
| ; |
| ; Inputs: |
| ; r0-r3, r12 PRESERVE |
| ; d0 blimit |
| ; d1 limit |
| ; d2 thresh |
| ; d3 p3 |
| ; d4 p2 |
| ; d5 p1 |
| ; d6 p0 |
| ; d7 q0 |
| ; d16 q1 |
| ; d17 q2 |
| ; d18 q3 |
| ; |
| ; Outputs: |
| ; d4 op1 |
| ; d5 op0 |
| ; d6 oq0 |
| ; d7 oq1 |
| |vpx_loop_filter_neon| PROC |
| ; filter_mask |
| vabd.u8 d19, d3, d4 ; m1 = abs(p3 - p2) |
| vabd.u8 d20, d4, d5 ; m2 = abs(p2 - p1) |
| vabd.u8 d21, d5, d6 ; m3 = abs(p1 - p0) |
| vabd.u8 d22, d16, d7 ; m4 = abs(q1 - q0) |
| vabd.u8 d3, d17, d16 ; m5 = abs(q2 - q1) |
| vabd.u8 d4, d18, d17 ; m6 = abs(q3 - q2) |
| |
| ; only compare the largest value to limit |
| vmax.u8 d19, d19, d20 ; m1 = max(m1, m2) |
| vmax.u8 d20, d21, d22 ; m2 = max(m3, m4) |
| |
| vabd.u8 d17, d6, d7 ; abs(p0 - q0) |
| |
| vmax.u8 d3, d3, d4 ; m3 = max(m5, m6) |
| |
| vmov.u8 d18, #0x80 |
| |
| vmax.u8 d23, d19, d20 ; m1 = max(m1, m2) |
| |
| ; hevmask |
| vcgt.u8 d21, d21, d2 ; (abs(p1 - p0) > thresh)*-1 |
| vcgt.u8 d22, d22, d2 ; (abs(q1 - q0) > thresh)*-1 |
| vmax.u8 d23, d23, d3 ; m1 = max(m1, m3) |
| |
| vabd.u8 d28, d5, d16 ; a = abs(p1 - q1) |
| vqadd.u8 d17, d17, d17 ; b = abs(p0 - q0) * 2 |
| |
| veor d7, d7, d18 ; qs0 |
| |
| vcge.u8 d23, d1, d23 ; abs(m1) > limit |
| |
| ; filter() function |
| ; convert to signed |
| |
| vshr.u8 d28, d28, #1 ; a = a / 2 |
| veor d6, d6, d18 ; ps0 |
| |
| veor d5, d5, d18 ; ps1 |
| vqadd.u8 d17, d17, d28 ; a = b + a |
| |
| veor d16, d16, d18 ; qs1 |
| |
| vmov.u8 d19, #3 |
| |
| vsub.s8 d28, d7, d6 ; ( qs0 - ps0) |
| |
| vcge.u8 d17, d0, d17 ; a > blimit |
| |
| vqsub.s8 d27, d5, d16 ; filter = clamp(ps1-qs1) |
| vorr d22, d21, d22 ; hevmask |
| |
| vmull.s8 q12, d28, d19 ; 3 * ( qs0 - ps0) |
| |
| vand d27, d27, d22 ; filter &= hev |
| vand d23, d23, d17 ; filter_mask |
| |
| vaddw.s8 q12, q12, d27 ; filter + 3 * (qs0 - ps0) |
| |
| vmov.u8 d17, #4 |
| |
| ; filter = clamp(filter + 3 * ( qs0 - ps0)) |
| vqmovn.s16 d27, q12 |
| |
| vand d27, d27, d23 ; filter &= mask |
| |
| vqadd.s8 d28, d27, d19 ; filter2 = clamp(filter+3) |
| vqadd.s8 d27, d27, d17 ; filter1 = clamp(filter+4) |
| vshr.s8 d28, d28, #3 ; filter2 >>= 3 |
| vshr.s8 d27, d27, #3 ; filter1 >>= 3 |
| |
| vqadd.s8 d19, d6, d28 ; u = clamp(ps0 + filter2) |
| vqsub.s8 d26, d7, d27 ; u = clamp(qs0 - filter1) |
| |
| ; outer tap adjustments |
| vrshr.s8 d27, d27, #1 ; filter = ++filter1 >> 1 |
| |
| veor d6, d26, d18 ; *oq0 = u^0x80 |
| |
| vbic d27, d27, d22 ; filter &= ~hev |
| |
| vqadd.s8 d21, d5, d27 ; u = clamp(ps1 + filter) |
| vqsub.s8 d20, d16, d27 ; u = clamp(qs1 - filter) |
| |
| veor d5, d19, d18 ; *op0 = u^0x80 |
| veor d4, d21, d18 ; *op1 = u^0x80 |
| veor d7, d20, d18 ; *oq1 = u^0x80 |
| |
| bx lr |
| ENDP ; |vpx_loop_filter_neon| |
| |
| END |
