📄 simple_idct_armv5te.s
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/* * Simple IDCT * * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> * Copyright (c) 2006 Mans Rullgard <mans@mansr.com> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#define W1 22725 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W2 21407 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W3 19266 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W4 16383 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W5 12873 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W6 8867 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define W7 4520 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */#define ROW_SHIFT 11#define COL_SHIFT 20#define W13 (W1 | (W3 << 16))#define W26 (W2 | (W6 << 16))#define W57 (W5 | (W7 << 16)) .text .alignw13: .long W13w26: .long W26w57: .long W57 .align .type idct_row_armv5te, %function .func idct_row_armv5teidct_row_armv5te: str lr, [sp, #-4]! ldrd v1, [a1, #8] ldrd a3, [a1] /* a3 = row[1:0], a4 = row[3:2] */ orrs v1, v1, v2 cmpeq v1, a4 cmpeq v1, a3, lsr #16 beq row_dc_only mov v1, #(1<<(ROW_SHIFT-1)) mov ip, #16384 sub ip, ip, #1 /* ip = W4 */ smlabb v1, ip, a3, v1 /* v1 = W4*row[0]+(1<<(RS-1)) */ ldr ip, [pc, #(w26-.-8)] /* ip = W2 | (W6 << 16) */ smultb a2, ip, a4 smulbb lr, ip, a4 add v2, v1, a2 sub v3, v1, a2 sub v4, v1, lr add v1, v1, lr ldr ip, [pc, #(w13-.-8)] /* ip = W1 | (W3 << 16) */ ldr lr, [pc, #(w57-.-8)] /* lr = W5 | (W7 << 16) */ smulbt v5, ip, a3 smultt v6, lr, a4 smlatt v5, ip, a4, v5 smultt a2, ip, a3 smulbt v7, lr, a3 sub v6, v6, a2 smulbt a2, ip, a4 smultt fp, lr, a3 sub v7, v7, a2 smulbt a2, lr, a4 ldrd a3, [a1, #8] /* a3=row[5:4] a4=row[7:6] */ sub fp, fp, a2 orrs a2, a3, a4 beq 1f smlabt v5, lr, a3, v5 smlabt v6, ip, a3, v6 smlatt v5, lr, a4, v5 smlabt v6, lr, a4, v6 smlatt v7, lr, a3, v7 smlatt fp, ip, a3, fp smulbt a2, ip, a4 smlatt v7, ip, a4, v7 sub fp, fp, a2 ldr ip, [pc, #(w26-.-8)] /* ip = W2 | (W6 << 16) */ mov a2, #16384 sub a2, a2, #1 /* a2 = W4 */ smulbb a2, a2, a3 /* a2 = W4*row[4] */ smultb lr, ip, a4 /* lr = W6*row[6] */ add v1, v1, a2 /* v1 += W4*row[4] */ add v1, v1, lr /* v1 += W6*row[6] */ add v4, v4, a2 /* v4 += W4*row[4] */ sub v4, v4, lr /* v4 -= W6*row[6] */ smulbb lr, ip, a4 /* lr = W2*row[6] */ sub v2, v2, a2 /* v2 -= W4*row[4] */ sub v2, v2, lr /* v2 -= W2*row[6] */ sub v3, v3, a2 /* v3 -= W4*row[4] */ add v3, v3, lr /* v3 += W2*row[6] */1: add a2, v1, v5 mov a3, a2, lsr #11 bic a3, a3, #0x1f0000 sub a2, v2, v6 mov a2, a2, lsr #11 add a3, a3, a2, lsl #16 add a2, v3, v7 mov a4, a2, lsr #11 bic a4, a4, #0x1f0000 add a2, v4, fp mov a2, a2, lsr #11 add a4, a4, a2, lsl #16 strd a3, [a1] sub a2, v4, fp mov a3, a2, lsr #11 bic a3, a3, #0x1f0000 sub a2, v3, v7 mov a2, a2, lsr #11 add a3, a3, a2, lsl #16 add a2, v2, v6 mov a4, a2, lsr #11 bic a4, a4, #0x1f0000 sub a2, v1, v5 mov a2, a2, lsr #11 add a4, a4, a2, lsl #16 strd a3, [a1, #8] ldr pc, [sp], #4row_dc_only: orr a3, a3, a3, lsl #16 bic a3, a3, #0xe000 mov a3, a3, lsl #3 mov a4, a3 strd a3, [a1] strd a3, [a1, #8] ldr pc, [sp], #4 .endfunc .macro idct_col ldr a4, [a1] /* a4 = col[1:0] */ mov ip, #16384 sub ip, ip, #1 /* ip = W4 */#if 0 mov v1, #(1<<(COL_SHIFT-1)) smlabt v2, ip, a4, v1 /* v2 = W4*col[1] + (1<<(COL_SHIFT-1)) */ smlabb v1, ip, a4, v1 /* v1 = W4*col[0] + (1<<(COL_SHIFT-1)) */ ldr a4, [a1, #(16*4)]#else mov v1, #((1<<(COL_SHIFT-1))/W4) /* this matches the C version */ add v2, v1, a4, asr #16 rsb v2, v2, v2, lsl #14 mov a4, a4, lsl #16 add v1, v1, a4, asr #16 ldr a4, [a1, #(16*4)] rsb v1, v1, v1, lsl #14#endif smulbb lr, ip, a4 smulbt a3, ip, a4 sub v3, v1, lr sub v5, v1, lr add v7, v1, lr add v1, v1, lr sub v4, v2, a3 sub v6, v2, a3 add fp, v2, a3 ldr ip, [pc, #(w26-.-8)] ldr a4, [a1, #(16*2)] add v2, v2, a3 smulbb lr, ip, a4 smultb a3, ip, a4 add v1, v1, lr sub v7, v7, lr add v3, v3, a3 sub v5, v5, a3 smulbt lr, ip, a4 smultt a3, ip, a4 add v2, v2, lr sub fp, fp, lr add v4, v4, a3 ldr a4, [a1, #(16*6)] sub v6, v6, a3 smultb lr, ip, a4 smulbb a3, ip, a4 add v1, v1, lr sub v7, v7, lr sub v3, v3, a3 add v5, v5, a3 smultt lr, ip, a4 smulbt a3, ip, a4 add v2, v2, lr sub fp, fp, lr sub v4, v4, a3 add v6, v6, a3 stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp} ldr ip, [pc, #(w13-.-8)] ldr a4, [a1, #(16*1)] ldr lr, [pc, #(w57-.-8)] smulbb v1, ip, a4 smultb v3, ip, a4 smulbb v5, lr, a4 smultb v7, lr, a4 smulbt v2, ip, a4 smultt v4, ip, a4 smulbt v6, lr, a4 smultt fp, lr, a4 rsb v4, v4, #0 ldr a4, [a1, #(16*3)] rsb v3, v3, #0 smlatb v1, ip, a4, v1 smlatb v3, lr, a4, v3 smulbb a3, ip, a4 smulbb a2, lr, a4 sub v5, v5, a3 sub v7, v7, a2 smlatt v2, ip, a4, v2 smlatt v4, lr, a4, v4 smulbt a3, ip, a4 smulbt a2, lr, a4 sub v6, v6, a3 ldr a4, [a1, #(16*5)] sub fp, fp, a2 smlabb v1, lr, a4, v1 smlabb v3, ip, a4, v3 smlatb v5, lr, a4, v5 smlatb v7, ip, a4, v7 smlabt v2, lr, a4, v2 smlabt v4, ip, a4, v4 smlatt v6, lr, a4, v6 ldr a3, [a1, #(16*7)] smlatt fp, ip, a4, fp smlatb v1, lr, a3, v1 smlabb v3, lr, a3, v3 smlatb v5, ip, a3, v5 smulbb a4, ip, a3 smlatt v2, lr, a3, v2 sub v7, v7, a4 smlabt v4, lr, a3, v4 smulbt a4, ip, a3 smlatt v6, ip, a3, v6 sub fp, fp, a4 .endm .align .type idct_col_armv5te, %function .func idct_col_armv5teidct_col_armv5te: str lr, [sp, #-4]! idct_col ldmfd sp!, {a3, a4} adds a2, a3, v1 mov a2, a2, lsr #20 orrmi a2, a2, #0xf000 add ip, a4, v2 mov ip, ip, asr #20 orr a2, a2, ip, lsl #16 str a2, [a1] subs a3, a3, v1 mov a2, a3, lsr #20 orrmi a2, a2, #0xf000 sub a4, a4, v2 mov a4, a4, asr #20 orr a2, a2, a4, lsl #16 ldmfd sp!, {a3, a4} str a2, [a1, #(16*7)] subs a2, a3, v3 mov a2, a2, lsr #20 orrmi a2, a2, #0xf000 sub ip, a4, v4 mov ip, ip, asr #20 orr a2, a2, ip, lsl #16 str a2, [a1, #(16*1)] adds a3, a3, v3 mov a2, a3, lsr #20 orrmi a2, a2, #0xf000 add a4, a4, v4 mov a4, a4, asr #20 orr a2, a2, a4, lsl #16 ldmfd sp!, {a3, a4} str a2, [a1, #(16*6)] adds a2, a3, v5 mov a2, a2, lsr #20 orrmi a2, a2, #0xf000 add ip, a4, v6 mov ip, ip, asr #20 orr a2, a2, ip, lsl #16 str a2, [a1, #(16*2)] subs a3, a3, v5 mov a2, a3, lsr #20 orrmi a2, a2, #0xf000 sub a4, a4, v6 mov a4, a4, asr #20 orr a2, a2, a4, lsl #16 ldmfd sp!, {a3, a4} str a2, [a1, #(16*5)] adds a2, a3, v7 mov a2, a2, lsr #20 orrmi a2, a2, #0xf000 add ip, a4, fp mov ip, ip, asr #20 orr a2, a2, ip, lsl #16 str a2, [a1, #(16*3)] subs a3, a3, v7 mov a2, a3, lsr #20 orrmi a2, a2, #0xf000 sub a4, a4, fp mov a4, a4, asr #20 orr a2, a2, a4, lsl #16 str a2, [a1, #(16*4)] ldr pc, [sp], #4 .endfunc .align .type idct_col_put_armv5te, %function .func idct_col_put_armv5teidct_col_put_armv5te: str lr, [sp, #-4]! idct_col ldmfd sp!, {a3, a4} ldr lr, [sp, #32] add a2, a3, v1 movs a2, a2, asr #20 movmi a2, #0 cmp a2, #255 movgt a2, #255 add ip, a4, v2 movs ip, ip, asr #20 movmi ip, #0 cmp ip, #255 movgt ip, #255 orr a2, a2, ip, lsl #8 sub a3, a3, v1 movs a3, a3, asr #20 movmi a3, #0⌨️ 快捷键说明
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