@/******************************************************************************
@ *
@ * 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_chroma_a9q.s
@*
@* @brief
@* Contains function definitions for inter prediction interpolation.
@*
@* @author
@* Ittaim
@*
@* @par List of Functions:
@*
@* - ih264_inter_pred_chroma_a9q()
@*
@* @remarks
@* None
@*
@*******************************************************************************
@*
@* All the functions here are replicated from ih264_inter_pred_filters.c
@
@**
@**
@**
@
@**
@*******************************************************************************
@*
@* @brief
@* Interprediction chroma filter
@*
@* @par Description:
@* Applies filtering to chroma samples as mentioned in
@* sec 8.4.2.2.2 titled "chroma sample interpolation process"
@*
@* @param[in] pu1_src
@* UWORD8 pointer to the source containing alternate U and V samples
@*
@* @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]uc_dx
@* dx value where the sample is to be produced(refer sec 8.4.2.2.2 )
@*
@* @param[in] uc_dy
@* dy value where the sample is to be produced(refer sec 8.4.2.2.2 )
@*
@* @param[in] ht
@* integer height of the array
@*
@* @param[in] wd
@* integer width of the array
@*
@* @returns
@*
@* @remarks
@* None
@*
@*******************************************************************************
@*
@void ih264_inter_pred_chroma(UWORD8 *pu1_src,
@ UWORD8 *pu1_dst,
@ WORD32 src_strd,
@ WORD32 dst_strd,
@ UWORD8 u1_dx,
@ UWORD8 u1_dy,
@ WORD32 ht,
@ WORD32 wd)
@**************Variables Vs Registers*****************************************
@ r0 => *pu1_src
@ r1 => *pu1_dst
@ r2 => src_strd
@ r3 => dst_strd
@ r4 => u1_dx
@ r5 => u1_dy
@ r6 => height
@ r7 => width
@
.text
.p2align 2
.global ih264_inter_pred_chroma_a9q
ih264_inter_pred_chroma_a9q:
stmfd sp!, {r4-r12, r14} @store register values to stack
vstmdb sp!, {d8-d15} @push neon registers to stack
ldr r4, [sp, #104]
ldr r5, [sp, #108]
ldr r6, [sp, #112]
ldr r7, [sp, #116]
rsb r8, r4, #8 @8-u1_dx
rsb r9, r5, #8 @8-u1_dy
mul r10, r8, r9
mul r11, r4, r9
vdup.u8 d28, r10
vdup.u8 d29, r11
mul r10, r8, r5
mul r11, r4, r5
vdup.u8 d30, r10
vdup.u8 d31, r11
subs r12, r7, #2 @if wd=4 branch to loop_4
beq loop_2
subs r12, r7, #4 @if wd=8 branch to loop_8
beq loop_4
loop_8:
sub r6, #1
vld1.8 {d0, d1, d2}, [r0], r2 @ Load row0
vld1.8 {d5, d6, d7}, [r0], r2 @ Load row1
vext.8 d3, d0, d1, #2
vext.8 d8, d5, d6, #2
vmull.u8 q5, d0, d28
vmlal.u8 q5, d5, d30
vmlal.u8 q5, d3, d29
vmlal.u8 q5, d8, d31
vext.8 d9, d6, d7, #2
vext.8 d4, d1, d2, #2
inner_loop_8:
vmull.u8 q6, d6, d30
vmlal.u8 q6, d1, d28
vmlal.u8 q6, d9, d31
vmlal.u8 q6, d4, d29
vmov d0, d5
vmov d3, d8
vqrshrun.s16 d14, q5, #6
vmov d1, d6
vmov d4, d9
vld1.8 {d5, d6, d7}, [r0], r2 @ Load row1
vqrshrun.s16 d15, q6, #6
vext.8 d8, d5, d6, #2
subs r6, #1
vext.8 d9, d6, d7, #2
vst1.8 {q7}, [r1], r3 @ Store dest row
vmull.u8 q5, d0, d28
vmlal.u8 q5, d5, d30
vmlal.u8 q5, d3, d29
vmlal.u8 q5, d8, d31
bne inner_loop_8
vmull.u8 q6, d6, d30
vmlal.u8 q6, d1, d28
vmlal.u8 q6, d9, d31
vmlal.u8 q6, d4, d29
vqrshrun.s16 d14, q5, #6
vqrshrun.s16 d15, q6, #6
vst1.8 {q7}, [r1], r3 @ Store dest row
b end_func
loop_4:
sub r6, #1
vld1.8 {d0, d1}, [r0], r2 @ Load row0
vld1.8 {d2, d3}, [r0], r2 @ Load row1
vext.8 d1, d0, d1, #2
vext.8 d3, d2, d3, #2
vmull.u8 q2, d2, d30
vmlal.u8 q2, d0, d28
vmlal.u8 q2, d3, d31
vmlal.u8 q2, d1, d29
inner_loop_4:
subs r6, #1
vmov d0, d2
vmov d1, d3
vld1.8 {d2, d3}, [r0], r2 @ Load row1
vqrshrun.s16 d6, q2, #6
vext.8 d3, d2, d3, #2
vst1.8 {d6}, [r1], r3 @ Store dest row
vmull.u8 q2, d0, d28
vmlal.u8 q2, d2, d30
vmlal.u8 q2, d1, d29
vmlal.u8 q2, d3, d31
bne inner_loop_4
vqrshrun.s16 d6, q2, #6
vst1.8 {d6}, [r1], r3 @ Store dest row
b end_func
loop_2:
vld1.8 {d0}, [r0], r2 @ Load row0
vext.8 d1, d0, d0, #2
vld1.8 {d2}, [r0], r2 @ Load row1
vext.8 d3, d2, d2, #2
vmull.u8 q2, d0, d28
vmlal.u8 q2, d1, d29
vmlal.u8 q2, d2, d30
vmlal.u8 q2, d3, d31
vld1.8 {d6}, [r0] @ Load row2
vqrshrun.s16 d4, q2, #6
vext.8 d7, d6, d6, #2
vst1.32 d4[0], [r1], r3 @ Store dest row0
vmull.u8 q4, d2, d28
vmlal.u8 q4, d3, d29
vmlal.u8 q4, d6, d30
vmlal.u8 q4, d7, d31
subs r6, #2
vqrshrun.s16 d8, q4, #6
vst1.32 d8[0], [r1], r3 @ Store dest row1
bne loop_2 @ repeat if ht=2
end_func:
vldmia sp!, {d8-d15} @ Restore neon registers that were saved
ldmfd sp!, {r4-r12, pc} @ Restoring registers from stack