@/***************************************************************************** @* @* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore @* @* 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. @* @*****************************************************************************/ @/** @******************************************************************************* @* @file @* ihevc_weighted_pred_bi.s @* @* @brief @* contains function definitions for weighted prediction used in inter @* prediction @* @* @author @* parthiban v @* @* @par list of functions: @* - ihevc_weighted_pred_bi() @* @* @remarks @* none @* @******************************************************************************* @*/ @/** @******************************************************************************* @* @* @brief @* does bi-weighted prediction on the arrays pointed by pi2_src1 and @* pi2_src2 and stores it at location pointed by pi2_dst assumptions : the @* function is optimized considering the fact width and height are multiple @* of 2. @* @* @par description: @* dst = ( (src1 + lvl_shift1)*wgt0 + (src2 + lvl_shift2)*wgt1 + (off0 + @* off1 + 1) << (shift - 1) ) >> shift @* @* @param[in] pi2_src1 @* pointer to source 1 @* @* @param[in] pi2_src2 @* pointer to source 2 @* @* @param[out] pu1_dst @* pointer to destination @* @* @param[in] src_strd1 @* source stride 1 @* @* @param[in] src_strd2 @* source stride 2 @* @* @param[in] dst_strd @* destination stride @* @* @param[in] wgt0 @* weight to be multiplied to source 1 @* @* @param[in] off0 @* offset 0 @* @* @param[in] wgt1 @* weight to be multiplied to source 2 @* @* @param[in] off1 @* offset 1 @* @* @param[in] shift @* (14 bit depth) + log2_weight_denominator @* @* @param[in] lvl_shift1 @* added before shift and offset @* @* @param[in] lvl_shift2 @* added before shift and offset @* @* @param[in] ht @* height of the source @* @* @param[in] wd @* width of the source @* @* @returns @* @* @remarks @* none @* @******************************************************************************* @*/ @void ihevc_weighted_pred_bi(word16 *pi2_src1, @ word16 *pi2_src2, @ uword8 *pu1_dst, @ word32 src_strd1, @ word32 src_strd2, @ word32 dst_strd, @ word32 wgt0, @ word32 off0, @ word32 wgt1, @ word32 off1, @ word32 shift, @ word32 lvl_shift1, @ word32 lvl_shift2, @ word32 ht, @ word32 wd) @**************variables vs registers***************************************** @ r0 => *pi2_src1 @ r1 => *pi2_src2 @ r2 => *pu1_dst @ r3 => src_strd1 @ r4 => src_strd2 @ r5 => dst_strd @ r6 => wgt0 @ r7 => off0 @ r8 => wgt1 @ r9 => off1 @ r10 => shift @ r11 => lvl_shift1 @ r12 => lvl_shift2 @ r14 => ht @ r7 => wd .text .align 4 .globl ihevc_weighted_pred_bi_a9q .type ihevc_weighted_pred_bi_a9q, %function ihevc_weighted_pred_bi_a9q: stmfd sp!, {r4-r12, r14} @stack stores the values of the arguments ldr r6,[sp,#48] @load wgt0 ldr r11,[sp,#68] @load lvl_shift1 ldr r12,[sp,#72] @load lvl_shift2 vmov.s16 d7[0],r6 @moved for scalar multiplication mul r4,r11,r6 @lvl_shift1 * wgt0 ldr r8,[sp,#56] @load wgt1 ldr r7,[sp,#52] @load off0 vmov.s16 d7[1],r8 @moved for scalar multiplication mla r4,r12,r8,r4 @(lvl_shift1 * wgt0) + (lvl_shift2 * wgt1) ldr r9,[sp,#60] @load off1 add r5,r7,r9 @off0 + off1 ldr r10,[sp,#64] @load shift add r5,r5,#1 @off0 + off1 + 1 sub r14,r10,#1 @shift - 1 ldr r7,[sp,#80] @load wd lsl r5,r5,r14 @((off0 + off1 + 1) << (shift - 1)) vdup.u32 q14,r10 @vmovq_n_s32(0-shift) add r4,r4,r5 @tmp_lvl_shift += ((off0 + off1 + 1) << (shift - 1)) vdup.u32 q15,r4 @vmovq_n_s32(tmp_lvl_shift) vneg.s32 q14,q14 ldr r4,[sp,#40] @load src_strd2 lsl r9,r7,#1 ldr r5,[sp,#44] @load dst_strd lsl r3,r3,#1 ldr r14,[sp,#76] @load ht lsl r4,r4,#1 cmp r14,#0 @check ht == 0 beq end_loops @if equal, then end the function outer_loop: cmp r7,#0 @check wd == 0 beq end_loops @if equal, then end the function core_loop: add r6,r0,r3 @pi2_src_tmp1 = pi2_src1 + 2*src_strd1(2* because pi1_src is a 16 bit pointer) add r8,r1,r4 @pi2_src_tmp2 = pi2_src2 + 2*src_strd2(2* because pi2_src is a 16 bit pointer) vld1.s16 {d0},[r0]! @load and increment the pi2_src1 add r10,r2,r5 @pu1_dst_tmp = pu1_dst + dst_strd vld1.s16 {d1},[r1]! @load and increment the pi2_src2 vmull.s16 q2,d0,d7[0] @vmull_n_s16(pi2_src1_val1, (int16_t) wgt0) vld1.s16 {d2},[r6],r3 @load and increment the pi2_src_tmp1 ii iteration vmull.s16 q4,d1,d7[1] @vmull_n_s16(pi2_src2_val1, (int16_t) wgt1) vld1.s16 {d3},[r8],r4 @load and increment the pi2_src_tmp1 ii iteration vadd.s32 q2,q2,q4 @vaddq_s32(i4_tmp1_t1, i4_tmp1_t2) vld1.s16 {d0},[r6],r3 @load and increment the pi2_src1 iii iteration vmull.s16 q5,d2,d7[0] @vmull_n_s16(pi2_src1_val2, (int16_t) wgt0) ii iteration vld1.s16 {d1},[r8],r4 @load and increment the pi2_src2 iii iteration vadd.s32 q2,q2,q15 @vaddq_s32(i4_tmp1_t1, tmp_lvl_shift_t) vmull.s16 q7,d0,d7[0] @vmull_n_s16(pi2_src1_val1, (int16_t) wgt0) iii iteration vld1.s16 {d2},[r6],r3 @load and increment the pi2_src_tmp1 iv iteration vmull.s16 q6,d3,d7[1] @vmull_n_s16(pi2_src2_val2, (int16_t) wgt1) ii iteration vshl.s32 q2,q2,q14 @vshlq_s32(i4_tmp1_t1, tmp_shift_t) vld1.s16 {d3},[r8],r4 @load and increment the pi2_src_tmp1 iv iteration vadd.s32 q5,q5,q6 @vaddq_s32(i4_tmp2_t1, i4_tmp2_t2) ii iteration vqmovun.s32 d4,q2 @vqmovun_s32(sto_res_tmp1) vmull.s16 q8,d1,d7[1] @vmull_n_s16(pi2_src2_val1, (int16_t) wgt1) iii iteration vadd.s32 q5,q5,q15 @vaddq_s32(i4_tmp2_t1, tmp_lvl_shift_t) ii iteration vmov.s32 d5,d4 @vcombine_u16(sto_res_tmp2, sto_res_tmp2) vadd.s32 q7,q7,q8 @vaddq_s32(i4_tmp1_t1, i4_tmp1_t2) iii iteration vshl.s32 q5,q5,q14 @vshlq_s32(i4_tmp2_t1, tmp_shift_t) ii iteration vmull.s16 q9,d2,d7[0] @vmull_n_s16(pi2_src1_val2, (int16_t) wgt0) iv iteration vqmovn.u16 d4,q2 @vqmovn_u16(sto_res_tmp3) vadd.s32 q7,q7,q15 @vaddq_s32(i4_tmp1_t1, tmp_lvl_shift_t) iii iteration vqmovun.s32 d10,q5 @vqmovun_s32(sto_res_tmp1) ii iteration vmull.s16 q10,d3,d7[1] @vmull_n_s16(pi2_src2_val2, (int16_t) wgt1) iv iteration vshl.s32 q7,q7,q14 @vshlq_s32(i4_tmp1_t1, tmp_shift_t) iii iteration vmov.s32 d11,d10 @vcombine_u16(sto_res_tmp2, sto_res_tmp2) ii iteration vadd.s32 q9,q9,q10 @vaddq_s32(i4_tmp2_t1, i4_tmp2_t2) iv iteration vqmovun.s32 d14,q7 @vqmovun_s32(sto_res_tmp1) iii iteration vadd.s32 q9,q9,q15 @vaddq_s32(i4_tmp2_t1, tmp_lvl_shift_t) iv iteration vst1.s32 {d4[0]},[r2]! @store pu1_dst i iteration vqmovn.u16 d10,q5 @vqmovn_u16(sto_res_tmp3) ii iteration vshl.s32 q9,q9,q14 @vshlq_s32(i4_tmp2_t1, tmp_shift_t) iv iteration vst1.s32 {d10[0]},[r10],r5 @store pu1_dst ii iteration vmov.s32 d15,d14 @vcombine_u16(sto_res_tmp2, sto_res_tmp2) iii iteration vqmovn.u16 d14,q7 @vqmovn_u16(sto_res_tmp3) iii iteration vqmovun.s32 d18,q9 @vqmovun_s32(sto_res_tmp1) iv iteration vmov.s32 d19,d18 @vcombine_u16(sto_res_tmp2, sto_res_tmp2) vst1.s32 {d14[0]},[r10],r5 @store pu1_dst iii iteration vqmovn.u16 d18,q9 @vqmovn_u16(sto_res_tmp3) iv iteration subs r7,r7,#4 @decrement wd by 4 and check for 0 vst1.s32 {d18[0]},[r10],r5 @store pu1_dst iv iteration bgt core_loop @if greater than 0 repeat the core loop again end_core_loop: rsb r11,r9,r3,lsl #2 @2*src_strd1 - wd subs r14,r14,#4 @decrement the ht by 4 rsb r12,r9,r4,lsl #2 @2*src_strd2 - wd add r0,r0,r11 @pi2_src1 + 4*src_strd1 - 2*wd(since pi2_src1 is 16 bit pointer double the increment with double the wd decrement) asr r7,r9,#1 add r1,r1,r12 @pi2_src2 + 4*src_strd2 - 2*wd rsb r10,r7,r5,lsl #2 @2*dst_strd - wd add r2,r2,r10 @pu1_dst + dst_std - wd bgt core_loop @if ht is greater than 0 goto outer_loop end_loops: ldmfd sp!,{r4-r12,r15} @reload the registers from sp