/* * ARM NEON optimised IDCT functions for HEVC decoding * * Copyright (c) 2014 Seppo Tomperi * Copyright (c) 2017 Alexandra Hájková * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/arm/asm.S" const trans, align=4 .short 64, 83, 64, 36 .short 89, 75, 50, 18 .short 90, 87, 80, 70 .short 57, 43, 25, 9 endconst .macro idct_4x4_dc bitdepth function ff_hevc_idct_4x4_dc_\bitdepth\()_neon, export=1 ldrsh r1, [r0] ldr r2, =(1 << (13 - \bitdepth)) add r1, #1 asr r1, #1 add r1, r2 asr r1, #(14 - \bitdepth) vdup.16 q0, r1 vdup.16 q1, r1 vst1.16 {q0, q1}, [r0, :128] bx lr endfunc .endm .macro idct_8x8_dc bitdepth function ff_hevc_idct_8x8_dc_\bitdepth\()_neon, export=1 ldrsh r1, [r0] ldr r2, =(1 << (13 - \bitdepth)) add r1, #1 asr r1, #1 add r1, r2 asr r1, #(14 - \bitdepth) vdup.16 q8, r1 vdup.16 q9, r1 vmov.16 q10, q8 vmov.16 q11, q8 vmov.16 q12, q8 vmov.16 q13, q8 vmov.16 q14, q8 vmov.16 q15, q8 vstm r0, {q8-q15} bx lr endfunc .endm .macro idct_16x16_dc bitdepth function ff_hevc_idct_16x16_dc_\bitdepth\()_neon, export=1 ldrsh r1, [r0] ldr r2, =(1 << (13 - \bitdepth)) add r1, #1 asr r1, #1 add r1, r2 asr r1, #(14 - \bitdepth) vdup.16 q8, r1 vdup.16 q9, r1 vmov.16 q10, q8 vmov.16 q11, q8 vmov.16 q12, q8 vmov.16 q13, q8 vmov.16 q14, q8 vmov.16 q15, q8 vstm r0!, {q8-q15} vstm r0!, {q8-q15} vstm r0!, {q8-q15} vstm r0, {q8-q15} bx lr endfunc .endm .macro idct_32x32_dc bitdepth function ff_hevc_idct_32x32_dc_\bitdepth\()_neon, export=1 ldrsh r1, [r0] ldr r2, =(1 << (13 - \bitdepth)) add r1, #1 asr r1, #1 add r1, r2 asr r1, #(14 - \bitdepth) mov r3, #16 vdup.16 q8, r1 vdup.16 q9, r1 vmov.16 q10, q8 vmov.16 q11, q8 vmov.16 q12, q8 vmov.16 q13, q8 vmov.16 q14, q8 vmov.16 q15, q8 1: subs r3, #1 vstm r0!, {q8-q15} bne 1b bx lr endfunc .endm .macro sum_sub out, in, c, op .ifc \op, + vmlal.s16 \out, \in, \c .else vmlsl.s16 \out, \in, \c .endif .endm .macro tr_4x4 in0, in1, in2, in3, out0, out1, out2, out3, shift, tmp0, tmp1, tmp2, tmp3, tmp4 vshll.s16 \tmp0, \in0, #6 vmull.s16 \tmp2, \in1, d4[1] vmov \tmp1, \tmp0 vmull.s16 \tmp3, \in1, d4[3] vmlal.s16 \tmp0, \in2, d4[0] @e0 vmlsl.s16 \tmp1, \in2, d4[0] @e1 vmlal.s16 \tmp2, \in3, d4[3] @o0 vmlsl.s16 \tmp3, \in3, d4[1] @o1 vadd.s32 \tmp4, \tmp0, \tmp2 vsub.s32 \tmp0, \tmp0, \tmp2 vadd.s32 \tmp2, \tmp1, \tmp3 vsub.s32 \tmp1, \tmp1, \tmp3 vqrshrn.s32 \out0, \tmp4, #\shift vqrshrn.s32 \out3, \tmp0, #\shift vqrshrn.s32 \out1, \tmp2, #\shift vqrshrn.s32 \out2, \tmp1, #\shift .endm .macro tr_4x4_8 in0, in1, in2, in3, out0, out1, out2, out3, tmp0, tmp1, tmp2, tmp3 vshll.s16 \tmp0, \in0, #6 vld1.s16 {\in0}, [r1, :64]! vmov \tmp1, \tmp0 vmull.s16 \tmp2, \in1, \in0[1] vmull.s16 \tmp3, \in1, \in0[3] vmlal.s16 \tmp0, \in2, \in0[0] @e0 vmlsl.s16 \tmp1, \in2, \in0[0] @e1 vmlal.s16 \tmp2, \in3, \in0[3] @o0 vmlsl.s16 \tmp3, \in3, \in0[1] @o1 vld1.s16 {\in0}, [r1, :64] vadd.s32 \out0, \tmp0, \tmp2 vadd.s32 \out1, \tmp1, \tmp3 vsub.s32 \out2, \tmp1, \tmp3 vsub.s32 \out3, \tmp0, \tmp2 sub r1, r1, #8 .endm @ Do a 4x4 transpose, using q registers for the subtransposes that don't @ need to address the indiviudal d registers. @ r0,r1 == rq0, r2,r3 == rq1 .macro transpose_4x4 rq0, rq1, r0, r1, r2, r3 vtrn.32 \rq0, \rq1 vtrn.16 \r0, \r1 vtrn.16 \r2, \r3 .endm .macro idct_4x4 bitdepth function ff_hevc_idct_4x4_\bitdepth\()_neon, export=1 @r0 - coeffs vld1.s16 {q0-q1}, [r0, :128] movrel r1, trans vld1.s16 {d4}, [r1, :64] tr_4x4 d0, d1, d2, d3, d16, d17, d18, d19, 7, q10, q11, q12, q13, q0 transpose_4x4 q8, q9, d16, d17, d18, d19 tr_4x4 d16, d17, d18, d19, d0, d1, d2, d3, 20 - \bitdepth, q10, q11, q12, q13, q0 transpose_4x4 q0, q1, d0, d1, d2, d3 vst1.s16 {d0-d3}, [r0, :128] bx lr endfunc .endm .macro transpose8_4x4 r0, r1, r2, r3 vtrn.16 \r0, \r1 vtrn.16 \r2, \r3 vtrn.32 \r0, \r2 vtrn.32 \r1, \r3 .endm .macro transpose_8x8 r0, r1, r2, r3, r4, r5, r6, r7, l0, l1, l2, l3, l4, l5, l6, l7 transpose8_4x4 \r0, \r1, \r2, \r3 transpose8_4x4 \r4, \r5, \r6, \r7 transpose8_4x4 \l0, \l1, \l2, \l3 transpose8_4x4 \l4, \l5, \l6, \l7 .endm .macro tr_8x4 shift, in0, in1, in2, in3, in4, in5, in6, in7 tr_4x4_8 \in0, \in2, \in4, \in6, q8, q9, q10, q11, q12, q13, q14, q15 vmull.s16 q14, \in1, \in0[2] vmull.s16 q12, \in1, \in0[0] vmull.s16 q13, \in1, \in0[1] sum_sub q14, \in3, \in0[0], - sum_sub q12, \in3, \in0[1], + sum_sub q13, \in3, \in0[3], - sum_sub q14, \in5, \in0[3], + sum_sub q12, \in5, \in0[2], + sum_sub q13, \in5, \in0[0], - sum_sub q14, \in7, \in0[1], + sum_sub q12, \in7, \in0[3], + sum_sub q13, \in7, \in0[2], - vadd.s32 q15, q10, q14 vsub.s32 q10, q10, q14 vqrshrn.s32 \in2, q15, \shift vmull.s16 q15, \in1, \in0[3] sum_sub q15, \in3, \in0[2], - sum_sub q15, \in5, \in0[1], + sum_sub q15, \in7, \in0[0], - vqrshrn.s32 \in5, q10, \shift vadd.s32 q10, q8, q12 vsub.s32 q8, q8, q12 vadd.s32 q12, q9, q13 vsub.s32 q9, q9, q13 vadd.s32 q14, q11, q15 vsub.s32 q11, q11, q15 vqrshrn.s32 \in0, q10, \shift vqrshrn.s32 \in7, q8, \shift vqrshrn.s32 \in1, q12, \shift vqrshrn.s32 \in6, q9, \shift vqrshrn.s32 \in3, q14, \shift vqrshrn.s32 \in4, q11, \shift .endm .macro idct_8x8 bitdepth function ff_hevc_idct_8x8_\bitdepth\()_neon, export=1 @r0 - coeffs vpush {q4-q7} mov r1, r0 mov r2, #64 add r3, r0, #32 vld1.s16 {q0-q1}, [r1,:128], r2 vld1.s16 {q2-q3}, [r3,:128], r2 vld1.s16 {q4-q5}, [r1,:128], r2 vld1.s16 {q6-q7}, [r3,:128], r2 movrel r1, trans tr_8x4 7, d0, d2, d4, d6, d8, d10, d12, d14 tr_8x4 7, d1, d3, d5, d7, d9, d11, d13, d15 @ Transpose each 4x4 block, and swap how d4-d7 and d8-d11 are used. @ Layout before: @ d0 d1 @ d2 d3 @ d4 d5 @ d6 d7 @ d8 d9 @ d10 d11 @ d12 d13 @ d14 d15 transpose_8x8 d0, d2, d4, d6, d8, d10, d12, d14, d1, d3, d5, d7, d9, d11, d13, d15 @ Now the layout is: @ d0 d8 @ d2 d10 @ d4 d12 @ d6 d14 @ d1 d9 @ d3 d11 @ d5 d13 @ d7 d15 tr_8x4 20 - \bitdepth, d0, d2, d4, d6, d1, d3, d5, d7 vswp d0, d8 tr_8x4 20 - \bitdepth, d0, d10, d12, d14, d9, d11, d13, d15 vswp d0, d8 transpose_8x8 d0, d2, d4, d6, d8, d10, d12, d14, d1, d3, d5, d7, d9, d11, d13, d15 mov r1, r0 mov r2, #64 add r3, r0, #32 vst1.s16 {q0-q1}, [r1,:128], r2 vst1.s16 {q2-q3}, [r3,:128], r2 vst1.s16 {q4-q5}, [r1,:128], r2 vst1.s16 {q6-q7}, [r3,:128], r2 vpop {q4-q7} bx lr endfunc .endm .macro butterfly e, o, tmp_p, tmp_m vadd.s32 \tmp_p, \e, \o vsub.s32 \tmp_m, \e, \o .endm .macro tr16_8x4 in0, in1, in2, in3, in4, in5, in6, in7 tr_4x4_8 \in0, \in2, \in4, \in6, q8, q9, q10, q11, q12, q13, q14, q15 vmull.s16 q12, \in1, \in0[0] vmull.s16 q13, \in1, \in0[1] vmull.s16 q14, \in1, \in0[2] vmull.s16 q15, \in1, \in0[3] sum_sub q12, \in3, \in0[1], + sum_sub q13, \in3, \in0[3], - sum_sub q14, \in3, \in0[0], - sum_sub q15, \in3, \in0[2], - sum_sub q12, \in5, \in0[2], + sum_sub q13, \in5, \in0[0], - sum_sub q14, \in5, \in0[3], + sum_sub q15, \in5, \in0[1], + sum_sub q12, \in7, \in0[3], + sum_sub q13, \in7, \in0[2], - sum_sub q14, \in7, \in0[1], + sum_sub q15, \in7, \in0[0], - butterfly q8, q12, q0, q7 butterfly q9, q13, q1, q6 butterfly q10, q14, q2, q5 butterfly q11, q15, q3, q4 add r4, sp, #512 vst1.s16 {q0-q1}, [r4, :128]! vst1.s16 {q2-q3}, [r4, :128]! vst1.s16 {q4-q5}, [r4, :128]! vst1.s16 {q6-q7}, [r4, :128] .endm .macro load16 in0, in1, in2, in3, in4, in5, in6, in7 vld1.s16 {\in0}, [r1, :64], r2 vld1.s16 {\in1}, [r3, :64], r2 vld1.s16 {\in2}, [r1, :64], r2 vld1.s16 {\in3}, [r3, :64], r2 vld1.s16 {\in4}, [r1, :64], r2 vld1.s16 {\in5}, [r3, :64], r2 vld1.s16 {\in6}, [r1, :64], r2 vld1.s16 {\in7}, [r3, :64], r2 .endm .macro add_member in, t0, t1, t2, t3, t4, t5, t6, t7, op0, op1, op2, op3, op4, op5, op6, op7 sum_sub q5, \in, \t0, \op0 sum_sub q6, \in, \t1, \op1 sum_sub q7, \in, \t2, \op2 sum_sub q8, \in, \t3, \op3 sum_sub q9, \in, \t4, \op4 sum_sub q10, \in, \t5, \op5 sum_sub q11, \in, \t6, \op6 sum_sub q12, \in, \t7, \op7 .endm .macro butterfly16 in0, in1, in2, in3, in4, in5, in6, in7 vadd.s32 q4, \in0, \in1 vsub.s32 \in0, \in0, \in1 vadd.s32 \in1, \in2, \in3 vsub.s32 \in2, \in2, \in3 vadd.s32 \in3, \in4, \in5 vsub.s32 \in4, \in4, \in5 vadd.s32 \in5, \in6, \in7 vsub.s32 \in6, \in6, \in7 .endm .macro store16 in0, in1, in2, in3, in4, in5, in6, in7 vst1.s16 \in0, [r1, :64], r2 vst1.s16 \in1, [r3, :64], r4 vst1.s16 \in2, [r1, :64], r2 vst1.s16 \in3, [r3, :64], r4 vst1.s16 \in4, [r1, :64], r2 vst1.s16 \in5, [r3, :64], r4 vst1.s16 \in6, [r1, :64], r2 vst1.s16 \in7, [r3, :64], r4 .endm .macro scale out0, out1, out2, out3, out4, out5, out6, out7, in0, in1, in2, in3, in4, in5, in6, in7, shift vqrshrn.s32 \out0, \in0, \shift vqrshrn.s32 \out1, \in1, \shift vqrshrn.s32 \out2, \in2, \shift vqrshrn.s32 \out3, \in3, \shift vqrshrn.s32 \out4, \in4, \shift vqrshrn.s32 \out5, \in5, \shift vqrshrn.s32 \out6, \in6, \shift vqrshrn.s32 \out7, \in7, \shift .endm .macro tr_16x4 name, shift function func_tr_16x4_\name mov r1, r5 add r3, r5, #64 mov r2, #128 load16 d0, d1, d2, d3, d4, d5, d6, d7 movrel r1, trans tr16_8x4 d0, d1, d2, d3, d4, d5, d6, d7 add r1, r5, #32 add r3, r5, #(64 + 32) mov r2, #128 load16 d8, d9, d2, d3, d4, d5, d6, d7 movrel r1, trans + 16 vld1.s16 {q0}, [r1, :128] vmull.s16 q5, d8, d0[0] vmull.s16 q6, d8, d0[1] vmull.s16 q7, d8, d0[2] vmull.s16 q8, d8, d0[3] vmull.s16 q9, d8, d1[0] vmull.s16 q10, d8, d1[1] vmull.s16 q11, d8, d1[2] vmull.s16 q12, d8, d1[3] add_member d9, d0[1], d1[0], d1[3], d1[1], d0[2], d0[0], d0[3], d1[2], +, +, +, -, -, -, -, - add_member d2, d0[2], d1[3], d0[3], d0[1], d1[2], d1[0], d0[0], d1[1], +, +, -, -, -, +, +, + add_member d3, d0[3], d1[1], d0[1], d1[3], d0[0], d1[2], d0[2], d1[0], +, -, -, +, +, +, -, - add_member d4, d1[0], d0[2], d1[2], d0[0], d1[3], d0[1], d1[1], d0[3], +, -, -, +, -, -, +, + add_member d5, d1[1], d0[0], d1[0], d1[2], d0[1], d0[3], d1[3], d0[2], +, -, +, +, -, +, +, - add_member d6, d1[2], d0[3], d0[0], d0[2], d1[1], d1[3], d1[0], d0[1], +, -, +, -, +, +, -, + add_member d7, d1[3], d1[2], d1[1], d1[0], d0[3], d0[2], d0[1], d0[0], +, -, +, -, +, -, +, - add r4, sp, #512 vld1.s16 {q0-q1}, [r4, :128]! vld1.s16 {q2-q3}, [r4, :128]! butterfly16 q0, q5, q1, q6, q2, q7, q3, q8 scale d26, d27, d28, d29, d30, d31, d16, d17, q4, q0, q5, q1, q6, q2, q7, q3, \shift transpose8_4x4 d26, d28, d30, d16 transpose8_4x4 d17, d31, d29, d27 mov r1, r6 add r3, r6, #(24 +3*32) mov r2, #32 mov r4, #-32 store16 d26, d27, d28, d29, d30, d31, d16, d17 add r4, sp, #576 vld1.s16 {q0-q1}, [r4, :128]! vld1.s16 {q2-q3}, [r4, :128] butterfly16 q0, q9, q1, q10, q2, q11, q3, q12 scale d26, d27, d28, d29, d30, d31, d8, d9, q4, q0, q9, q1, q10, q2, q11, q3, \shift transpose8_4x4 d26, d28, d30, d8 transpose8_4x4 d9, d31, d29, d27 add r1, r6, #8 add r3, r6, #(16 + 3 * 32) mov r2, #32 mov r4, #-32 store16 d26, d27, d28, d29, d30, d31, d8, d9 bx lr endfunc .endm .macro idct_16x16 bitdepth function ff_hevc_idct_16x16_\bitdepth\()_neon, export=1 @r0 - coeffs push {r4-r7, lr} vpush {q4-q7} @ Align the stack, allocate a temp buffer T mov r7, sp T and r7, r7, #15 A and r7, sp, #15 add r7, r7, #640 sub sp, sp, r7 .irp i, 0, 1, 2, 3 add r5, r0, #(8 * \i) add r6, sp, #(8 * \i * 16) bl func_tr_16x4_firstpass .endr .irp i, 0, 1, 2, 3 add r5, sp, #(8 * \i) add r6, r0, #(8 * \i * 16) bl func_tr_16x4_secondpass_\bitdepth .endr add sp, sp, r7 vpop {q4-q7} pop {r4-r7, pc} endfunc .endm tr_16x4 firstpass, 7 tr_16x4 secondpass_8, 20 - 8 tr_16x4 secondpass_10, 20 - 10 .ltorg idct_4x4 8 idct_4x4_dc 8 idct_4x4 10 idct_4x4_dc 10 idct_8x8 8 idct_8x8_dc 8 idct_8x8 10 idct_8x8_dc 10 idct_16x16 8 idct_16x16_dc 8 idct_16x16 10 idct_16x16_dc 10 idct_32x32_dc 8 idct_32x32_dc 10