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@/******************************************************************************
@ *
@ * Copyright (C) 2015 The Android Open Source Project
@ *
@ * Licensed under the Apache License, Version 2.0 (the "License");
@ * you may not use this file except in compliance with the License.
@ * You may obtain a copy of the License at:
@ *
@ * http://www.apache.org/licenses/LICENSE-2.0
@ *
@ * Unless required by applicable law or agreed to in writing, software
@ * distributed under the License is distributed on an "AS IS" BASIS,
@ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@ * See the License for the specific language governing permissions and
@ * limitations under the License.
@ *
@ *****************************************************************************
@ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
@*/
@**
@******************************************************************************
@* @file
@* ih264_inter_pred_luma_vert_qpel_a9q.s
@*
@* @brief
@* Contains function definitions for inter prediction vertical quarter pel interpolation.
@*
@* @author
@* Mohit
@*
@* @par List of Functions:
@*
@* - ih264_inter_pred_luma_vert_qpel_a9q()
@*
@* @remarks
@* None
@*
@*******************************************************************************
@*
@* All the functions here are replicated from ih264_inter_pred_filters.c
@
@*******************************************************************************
@*
@* @brief
@* Quarter pel interprediction luma filter for vertical input
@*
@* @par Description:
@* Applies a 6 tap horizontal filter .The output is clipped to 8 bits
@* sec 8.4.2.2.1 titled "Luma sample interpolation process"
@*
@* @param[in] pu1_src
@* UWORD8 pointer to the source
@*
@* @param[out] pu1_dst
@* UWORD8 pointer to the destination
@*
@* @param[in] src_strd
@* integer source stride
@*
@* @param[in] dst_strd
@* integer destination stride
@*
@* @param[in] ht
@* integer height of the array
@*
@* @param[in] wd
@* integer width of the array
@*
@* @param[in] pu1_tmp: temporary buffer: UNUSED in this function
@*
@* @param[in] dydx: x and y reference offset for qpel calculations.
@* @returns
@*
@ @remarks
@* None
@*
@*******************************************************************************
@*
@void ih264_inter_pred_luma_vert (
@ UWORD8 *pu1_src,
@ UWORD8 *pu1_dst,
@ WORD32 src_strd,
@ WORD32 dst_strd,
@ WORD32 ht,
@ WORD32 wd,
@ UWORD8* pu1_tmp,
@ UWORD32 dydx)
@**************Variables Vs Registers*****************************************
@ r0 => *pu1_src
@ r1 => *pu1_dst
@ r2 => src_strd
@ r3 => dst_strd
@ r5 => ht
@ r6 => wd
@ r7 => dydx
.text
.p2align 2
.global ih264_inter_pred_luma_vert_qpel_a9q
ih264_inter_pred_luma_vert_qpel_a9q:
stmfd sp!, {r4-r12, r14} @store register values to stack
vstmdb sp!, {d8-d15} @push neon registers to stack
ldr r5, [sp, #104] @Loads ht
ldr r6, [sp, #108] @Loads wd
ldr r7, [sp, #116] @Loads dydx
and r7, r7, #12 @Finds y-offset
lsr r7, r7, #3 @dydx>>3
mul r7, r2, r7
add r7, r0, r7 @pu1_src + (y_offset>>1)*src_strd
vmov.u16 q11, #20 @ Filter coeff 0x14 into Q11
sub r0, r0, r2, lsl #1 @pu1_src-2*src_strd
subs r12, r6, #8 @if wd=8 branch to loop_8
vmov.u16 q12, #5 @ Filter coeff 0x5 into Q12
beq loop_8
subs r12, r6, #4 @if wd=4 branch to loop_4
beq loop_4
loop_16: @when wd=16
vld1.u32 {q0}, [r0], r2 @ Vector load from src[0_0]
vld1.u32 {q1}, [r0], r2 @ Vector load from src[1_0]
vld1.u32 {q2}, [r0], r2 @ Vector load from src[2_0]
vld1.u32 {q3}, [r0], r2 @ Vector load from src[3_0]
vld1.u32 {q4}, [r0], r2 @ Vector load from src[4_0]
vaddl.u8 q6, d4, d6 @ temp1 = src[2_0] + src[3_0]
vld1.u32 {q5}, [r0], r2 @ Vector load from src[5_0]
vaddl.u8 q7, d0, d10 @ temp = src[0_0] + src[5_0]
vaddl.u8 q8, d2, d8 @ temp2 = src[1_0] + src[4_0]
vmla.u16 q7, q6, q11 @ temp += temp1 * 20
vaddl.u8 q10, d1, d11 @ temp4 = src[0_8] + src[5_8]
vaddl.u8 q9, d5, d7 @ temp3 = src[2_8] + src[3_8]
vmla.u16 q10, q9, q11 @ temp4 += temp3 * 20
vld1.u32 {q0}, [r0], r2
vaddl.u8 q13, d3, d9 @ temp5 = src[1_8] + src[4_8]
vaddl.u8 q6, d6, d8
vmls.u16 q7, q8, q12 @ temp -= temp2 * 5
vaddl.u8 q8, d2, d0
vaddl.u8 q9, d4, d10
vmla.u16 q8, q6, q11
vmls.u16 q10, q13, q12 @ temp4 -= temp5 * 5
vaddl.u8 q13, d5, d11
vaddl.u8 q6, d7, d9
vqrshrun.s16 d30, q7, #5 @ dst[0_0] = CLIP_U8((temp +16) >> 5)
vaddl.u8 q7, d3, d1
vld1.u32 {q1}, [r0], r2
vmla.u16 q7, q6, q11
vmls.u16 q8, q9, q12
vqrshrun.s16 d31, q10, #5 @ dst[0_8] = CLIP_U8((temp4 +16) >> 5)
vld1.u32 {q10}, [r7], r2 @ Load for interpolation row 0
vrhadd.u8 q15, q10, q15 @ Interpolation to obtain qpel value
vaddl.u8 q9, d4, d2
vaddl.u8 q6, d8, d10
vst1.u32 {q15}, [r1], r3 @ Vector store to dst[0_0]
vmla.u16 q9, q6, q11
vaddl.u8 q10, d6, d0
vmls.u16 q7, q13, q12
vqrshrun.s16 d30, q8, #5
vaddl.u8 q6, d9, d11
vaddl.u8 q8, d5, d3
vaddl.u8 q13, d7, d1
vmla.u16 q8, q6, q11
vmls.u16 q9, q10, q12
vld1.u32 {q2}, [r0], r2
vqrshrun.s16 d31, q7, #5
vld1.u32 {q7}, [r7], r2 @ Load for interpolation row 1
vaddl.u8 q6, d10, d0
vrhadd.u8 q15, q7, q15 @ Interpolation to obtain qpel value
vaddl.u8 q7, d6, d4
vaddl.u8 q10, d8, d2
vmla.u16 q7, q6, q11
vmls.u16 q8, q13, q12
vst1.u32 {q15}, [r1], r3 @store row 1
vqrshrun.s16 d30, q9, #5
vaddl.u8 q9, d7, d5
vaddl.u8 q6, d11, d1
vmla.u16 q9, q6, q11
vaddl.u8 q13, d9, d3
vmls.u16 q7, q10, q12
vqrshrun.s16 d31, q8, #5
vld1.u32 {q8}, [r7], r2 @ Load for interpolation row 2
vmls.u16 q9, q13, q12
vrhadd.u8 q15, q8, q15 @ Interpolation to obtain qpel value
vaddl.u8 q6, d0, d2 @ temp1 = src[2_0] + src[3_0]
vst1.u32 {q15}, [r1], r3 @store row 2
vaddl.u8 q8, d10, d4 @ temp2 = src[1_0] + src[4_0]
vaddl.u8 q10, d9, d7 @ temp4 = src[0_8] + src[5_8]
vqrshrun.s16 d30, q7, #5
vaddl.u8 q13, d5, d11 @ temp5 = src[1_8] + src[4_8]
vaddl.u8 q7, d8, d6 @ temp = src[0_0] + src[5_0]
vqrshrun.s16 d31, q9, #5
vld1.u32 {q9}, [r7], r2 @ Load for interpolation row 3
vmla.u16 q7, q6, q11 @ temp += temp1 * 20
vrhadd.u8 q15, q9, q15 @ Interpolation to obtain qpel value
vaddl.u8 q9, d1, d3 @ temp3 = src[2_8] + src[3_8]
vst1.u32 {q15}, [r1], r3 @store row 3
subs r5, r5, #4 @ 4 rows processed, decrement by 4
subne r0, r0 , r2, lsl #2
subne r0, r0, r2
beq end_func @ Branch if height==4
b loop_16 @ looping if height = 8 or 16
loop_8:
@ Processing row0 and row1
vld1.u32 d0, [r0], r2 @ Vector load from src[0_0]
vld1.u32 d1, [r0], r2 @ Vector load from src[1_0]
vld1.u32 d2, [r0], r2 @ Vector load from src[2_0]
vld1.u32 d3, [r0], r2 @ Vector load from src[3_0]
vld1.u32 d4, [r0], r2 @ Vector load from src[4_0]
vld1.u32 d5, [r0], r2 @ Vector load from src[5_0]
vaddl.u8 q3, d2, d3 @ temp1 = src[2_0] + src[3_0]
vaddl.u8 q4, d0, d5 @ temp = src[0_0] + src[5_0]
vaddl.u8 q5, d1, d4 @ temp2 = src[1_0] + src[4_0]
vmla.u16 q4, q3, q11 @ temp += temp1 * 20
vld1.u32 d6, [r0], r2
vaddl.u8 q7, d3, d4
vaddl.u8 q8, d1, d6
vaddl.u8 q9, d2, d5
vmls.u16 q4, q5, q12 @ temp -= temp2 * 5
vmla.u16 q8, q7, q11
vld1.u32 d7, [r0], r2
vaddl.u8 q10, d4, d5
vaddl.u8 q6, d2, d7
vaddl.u8 q5, d3, d6
vmls.u16 q8, q9, q12
vqrshrun.s16 d26, q4, #5 @ dst[0_0] = CLIP_U8( (temp + 16) >> 5)
vmla.u16 q6, q10, q11
vld1.32 d8, [r7], r2 @Load value for interpolation (row0)
vld1.32 d9, [r7], r2 @Load value for interpolation (row1)
vld1.u32 d0, [r0], r2
vaddl.u8 q7, d5, d6
vqrshrun.s16 d27, q8, #5
vrhadd.u8 q13, q4, q13 @ Interpolation step for qpel calculation
vaddl.u8 q10, d3, d0
vmls.u16 q6, q5, q12
vst1.u32 d26, [r1], r3 @ Vector store to dst[0_0]
vaddl.u8 q9, d4, d7
vmla.u16 q10, q7, q11
vst1.u32 d27, [r1], r3 @ Vector store to dst[1_0]
vqrshrun.s16 d28, q6, #5
vmls.u16 q10, q9, q12
vld1.32 d12, [r7], r2 @Load value for interpolation (row2)
vld1.32 d13, [r7], r2 @Load value for interpolation (row3)
vqrshrun.s16 d29, q10, #5
subs r9, r5, #4
vrhadd.u8 q14, q6, q14
vst1.u32 d28, [r1], r3 @store row 2
vst1.u32 d29, [r1], r3 @store row 3
subs r5, r5, #4 @ 4 rows processed, decrement by 4
subne r0, r0 , r2, lsl #2
subne r0, r0, r2
beq end_func @ Branch if height==4
b loop_8 @looping if height == 8 or 16
loop_4:
@ Processing row0 and row1
vld1.u32 d0[0], [r0], r2 @ Vector load from src[0_0]
vld1.u32 d1[0], [r0], r2 @ Vector load from src[1_0]
vld1.u32 d2[0], [r0], r2 @ Vector load from src[2_0]
vld1.u32 d3[0], [r0], r2 @ Vector load from src[3_0]
vld1.u32 d4[0], [r0], r2 @ Vector load from src[4_0]
vld1.u32 d5[0], [r0], r2 @ Vector load from src[5_0]
vaddl.u8 q3, d2, d3 @ temp1 = src[2_0] + src[3_0]
vaddl.u8 q4, d0, d5 @ temp = src[0_0] + src[5_0]
vaddl.u8 q5, d1, d4 @ temp2 = src[1_0] + src[4_0]
vmla.u16 q4, q3, q11 @ temp += temp1 * 20
vld1.u32 d6, [r0], r2
vaddl.u8 q7, d3, d4
vaddl.u8 q8, d1, d6
vaddl.u8 q9, d2, d5
vmls.u16 q4, q5, q12 @ temp -= temp2 * 5
vld1.u32 d7[0], [r0], r2
vmla.u16 q8, q7, q11
vaddl.u8 q10, d4, d5
vaddl.u8 q6, d2, d7
vaddl.u8 q5, d3, d6
vmls.u16 q8, q9, q12
vqrshrun.s16 d26, q4, #5 @ dst[0_0] = CLIP_U8( (temp + 16) >> 5)
vld1.u32 d8[0], [r7], r2 @Load value for interpolation - row 0
vld1.u32 d9[0], [r7], r2 @Load value for interpolation - row 1
vmla.u16 q6, q10, q11
vld1.u32 d0[0], [r0], r2
vaddl.u8 q7, d5, d6
vqrshrun.s16 d27, q8, #5
vaddl.u8 q10, d3, d0
vrhadd.u8 q13, q13, q4 @Interpolation step for qpel calculation
vmls.u16 q6, q5, q12
vst1.u32 d26[0], [r1], r3 @ Vector store to dst[0_0]
vaddl.u8 q9, d4, d7
vmla.u16 q10, q7, q11
vst1.u32 d27[0], [r1], r3 @ store row 1
vqrshrun.s16 d28, q6, #5
vld1.u32 d12[0], [r7], r2 @Load value for interpolation - row 2
vld1.u32 d13[0], [r7], r2 @Load value for interpolation - row 3
vmls.u16 q10, q9, q12
vqrshrun.s16 d29, q10, #5
vrhadd.u8 q14, q6, q14 @Interpolation step for qpel calculation
vst1.u32 d28[0], [r1], r3 @store row 2
vst1.u32 d29[0], [r1], r3 @store row 3
subs r5, r5, #8
subeq r0, r0, r2, lsl #2
subeq r0, r0, r2
beq loop_4 @ Loop if height==8
end_func:
vldmia sp!, {d8-d15} @ Restore neon registers that were saved
ldmfd sp!, {r4-r12, pc} @Restoring registers from stack
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