/* * Simple IDCT * * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> * Copyright (c) 2006 Mans Rullgard <mans@mansr.com> * Copyright (c) 2007 Siarhei Siamashka <ssvb@users.sourceforge.net> * * 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 */ .arch armv5te /* IMPORTANT: this value should be the same as defined in dsputil.h */ #define MAX_NEG_CROP 1024 /* * ARM EABI guarantees 8 byte stack alignment, so we can use LDRD instructions * for accessing stack and load two registers per cycle to improve performance * on ARM11 and XScale */ #ifdef __ARM_EABI__ #define DWORD_ALIGNED_STACK 1 #endif #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)) #define W22 ((-W2 & 0xFFFF) | (W2 << 16)) #define W44 ((-W4 & 0xFFFF) | (W4 << 16)) #define W66 ((-W6 & 0xFFFF) | (W6 << 16)) #define M51 ((-W5 & 0xFFFF) | ((-W1 & 0xFFFF) << 16)) .text /* * a local pool with 64-bit constants for 'idct_rows_armv5te' function, * we align it at 16 byte boundary in order to ensure that it does not cross * cache line boundary (occupies only a single cache line) */ .balign 16 w2266idct_rows_armv5te: .long W22 .long W66 w1357idct_rows_armv5te: .long W13 .long W57 /* * A rows processing function. Benchmarks on a few video files show that * about 80-90% of uses of this function have all rows empty except for * the row[0]. * * On entry: * a1 - row address * lr - return address * * On exit: * a1 - row address * * Registers usage within this function: * a1 - row address * a2 - temporary register * v5, v6, v7, v8 - row data * v1, v2, v3, v4 - A0, A1, A2 and A3 variables * a3, a4 - used for loading constants * ip - temporary register * lr - temporary register, also holds initial row address value * to check end of loop condition */ .balign 32 .type idct_rows_armv5te, %function .func idct_rows_armv5te idct_rows_armv5te: str a1, [sp, #-4]! str lr, [sp, #-4]! mov lr, a1 ldrd v7, [a1, #(8 * 16 - 8)]! /* v7 = row[5:4], v8 = row[7:6] */ 1: ldrd v5, [a1, #-8]! /* v5 = row[1:0], v6 = row[3:2] */ orrs v1, v7, v8 cmpeq v1, v6 cmpeq v1, v5, lsr #16 bne 2f /* jump to process full row */ /* only row[0] is not empty here */ mov v5, v5, lsl #19 cmp a1, lr orr v5, v5, v5, lsr #16 str v5, [a1] str v5, [a1, #4] str v5, [a1, #8] str v5, [a1, #12] ldrned v7, [a1, #-8]! /* v7 = row[5:4], v8 = row[7:6] */ bne 1b ldr pc, [sp], #8 2: /* process full row */ /* the next code fragment calculates A variables */ ldr a2, w44 /* a2 = -W4 | (W4 << 16) */ ldrd a3, w2266idct_rows_armv5te /* a3 = -W2 | (W2 << 16) */ /* a4 = -W6 | (W6 << 16) */ mov v1, #(1<<(ROW_SHIFT-1)) smlatb v1, a2, v5, v1 /* v1 = W4*row[0]+(1<<(ROW_SHIFT-1)) */ cmp a1, lr smlabb v2, a2, v7, v1 /* v2 = v1 - W4*row[4] */ smlatb v1, a2, v7, v1 /* v1 = v1 - W4*row[4] */ smlabb v3, a4, v6, v2 /* v3 = v2 - W6*row[2] */ smlabb v4, a3, v6, v1 /* v4 = v1 - W2*row[2] */ smlatb v3, a3, v8, v3 /* v3 += W2*row[6] */ smlabb v4, a4, v8, v4 /* v4 -= W6*row[6] */ ldrd a3, w1357idct_rows_armv5te /* a3 = W1 | (W3 << 16) */ /* a4 = W5 | (W7 << 16) */ rsb v2, v3, v2, lsl #1 /* v2 = 2*v2 - v3 */ rsb v1, v4, v1, lsl #1 /* v1 = 2*v1 - v4 */ /* all A variables are now calculated (and stored in v1, v2, v3, v4 registers) */ smulbt a2, a3, v5 /* b0 = W1*row[1] */ smultt ip, a3, v5 /* tmp = W3*row[1] */ smultt lr, a4, v6 /* -b1 = W7*row[3] */ smlatt a2, a3, v6, a2 /* b0 += W3*row[3] */ smlabt lr, a3, v7, lr /* -b1 += W1*row[5] */ smlabt a2, a4, v7, a2 /* b0 += W5*row[5] */ smlabt lr, a4, v8, lr /* -b1 += W5*row[7] */ smlatt a2, a4, v8, a2 /* b0 += W7*row[7] */ sub lr, ip, lr /* b1 = -b1 - tmp */ /* B0 is now calculated (a2), B1 is now calculated (lr) */ add ip, v1, a2 /* ip = (A0 + B0) */ sub a2, v1, a2 /* a2 = (A0 - B0) */ mov ip, ip, asr #ROW_SHIFT mov a2, a2, asr #ROW_SHIFT strh ip, [a1, #0] /* row[0] = (A0 + B0) >> ROW_SHIFT */ strh a2, [a1, #14] /* row[7] = (A0 - B0) >> ROW_SHIFT */ ldr v1, m51 /* v1 = ((-W5 & 0xFFFF) | ((-W1 & 0xFFFF) << 16)) */ add ip, v2, lr /* ip = (A1 + B1) */ sub a2, v2, lr /* ip = (A1 - B1) */ mov ip, ip, asr #ROW_SHIFT mov a2, a2, asr #ROW_SHIFT strh ip, [a1, #2] /* row[1] = (A1 + B1) >> ROW_SHIFT */ strh a2, [a1, #12] /* row[6] = (A1 - B1) >> ROW_SHIFT */ smulbt a2, a4, v5 /* b2 = W5*row[1] */ smultt v2, a4, v5 /* b3 = W7*row[1] */ smlatt a2, v1, v6, a2 /* b2 -= W1*row[3] */ smlatt v2, a3, v7, v2 /* b3 += W3*row[5] */ smlatt a2, a4, v7, a2 /* b2 += W7*row[5] */ smlatt v2, v1, v8, v2 /* b3 -= W1*row[7] */ smlatt a2, a3, v8, a2 /* b2 += W3*row[7] */ smlabt v2, v1, v6, v2 /* b3 -= W5*row[3] */ /* B2 is now calculated (a2), B3 is now calculated (v2) */ ldr lr, [sp, #4] add ip, v3, a2 /* ip = (A2 + B2) */ sub a2, v3, a2 /* a2 = (A2 - B2) */ mov ip, ip, asr #ROW_SHIFT mov a2, a2, asr #ROW_SHIFT strh ip, [a1, #4] /* row[2] = (A2 + B2) >> ROW_SHIFT */ strh a2, [a1, #10] /* row[5] = (A2 - B2) >> ROW_SHIFT */ add ip, v4, v2 /* ip = (A3 + B3) */ sub a2, v4, v2 /* a2 = (A3 - B3) */ mov ip, ip, asr #ROW_SHIFT mov a2, a2, asr #ROW_SHIFT strh ip, [a1, #6] /* row[3] = (A3 + B3) >> ROW_SHIFT */ strh a2, [a1, #8] /* row[4] = (A3 - B3) >> ROW_SHIFT */ ldrned v7, [a1, #-8]! /* v7 = row[5:4], v8 = row[7:6] */ bne 1b ldr pc, [sp], #8 .endfunc /******************************************************************************/ /* * a global pool with 32-bit constants (used from all the functions in this module), * we align it at 32 byte boundary in order to ensure that it does not cross cache * line boundary (occupies only a single cache line) */ .balign 32 simple_idct_croptbl_armv5te: .long (ff_cropTbl + MAX_NEG_CROP) m51: .long M51 w44: .long W44 xxx: .long (((1<<(COL_SHIFT-1))/W4)*W4) m7: .long (-W7) /* * Enforce 8 byte stack alignment if it is not provided by ABI. Used at the beginning * of global functions. If stack is not properly aligned, real return address is * pushed to stack (thus fixing stack alignment) and lr register is set to a thunk * function 'unaligned_return_thunk_armv5te' which is responsible for providing * correct return from the function in this case. */ .macro idct_stackalign_armv5te #ifndef DWORD_ALIGNED_STACK tst sp, #4 strne lr, [sp, #-4]! adrne lr, unaligned_return_thunk_armv5te #endif .endm /* * Process two columns at once. * * Registers usage within this macro: * a1 - column address * a2 - temporary register * A0b (v1), A0t (v2), A1b (v3), A1t (v4), A2b (v5), A2t (v6), A3b (v7), A3t (v8) * B0b (v1), B0t (v2), B1b (v3), B1t (v4), B2b (v5), B2t (v6), B3b (v7), B3t (v8) * a3, a4 - used for loading constants * ip - temporary register * lr - temporary register * * Data on exit ('b' suffix - first column (also bottom 16-bits of a register), * 't' suffix - second column (also top 16-bits of a register)): * A0b, A0t, A1b, A1t, A2b, A2t, A3b, A3t - are returned in stack * B0b, B0t, B1b, B1t, B2b, B2t, B3b, B3t - are returned in v1, v2, v3, v4, v5, v6, v7, v8 registers * a1 - address of the next pair of columns */ .macro idct_two_col_armv5te DWORD_CONST_SUFFIX ldr v4, [a1], #4 /* v4 = col_t[0]:col_b[0] */ ldr a2, w44 /* a2 = -W4 | (W4 << 16) */ ldr v1, xxx /* v1 = (((1<<(COL_SHIFT-1))/W4)*W4) */ ldr ip, [a1, #(16*4 - 4)] /* ip = col_t[4]:col_b[4] */ ldrd a3, w2266\DWORD_CONST_SUFFIX /* a3 = -W2 | (W2 << 16) */ /* a4 = -W6 | (W6 << 16) */ smlatt v2, a2, v4, v1 /* A0t = W4 * (col_t[0] + ((1<<(COL_SHIFT-1))/W4)) */ smlatb v1, a2, v4, v1 /* A0b = W4 * (col_b[0] + ((1<<(COL_SHIFT-1))/W4)) */ ldr lr, [a1, #(16*2 - 4)] /* lr = col_t[2]:col_b[2] */ smlabb v3, a2, ip, v1 /* A1b = A0b - W4*col_b[4] */ smlatb v1, a2, ip, v1 /* A0b = A0b + W4*col_b[4] */ smlabt v4, a2, ip, v2 /* A1t = A0t - W4*col_t[4] */ smlatt v2, a2, ip, v2 /* A0t = A0t + W4*col_t[4] */ ldr ip, [a1, #(16*6 - 4)] /* ip = col_t[6]:col_b[6] */ smlabb v5, a4, lr, v3 /* A2b = A1b - W6*col_b[2] */ smlabb v7, a3, lr, v1 /* A3b = A0b - W2*col_b[2] */ smlabt v6, a4, lr, v4 /* A2t = A1t - W6*col_t[2] */ smlabt v8, a3, lr, v2 /* A3t = A0t - W2*col_t[2] */ ldr lr, [a1, #(16*1 - 4)] /* lr = col_t[1]:col_b[1] */ smlatb v5, a3, ip, v5 /* A2b += W2*col_b[6] */ smlabb v7, a4, ip, v7 /* A3b -= W6*col_b[6] */ smlatt v6, a3, ip, v6 /* A2t += W2*col_t[6] */ smlabt v8, a4, ip, v8 /* A3t -= W6*col_t[6] */ ldrd a3, w1357\DWORD_CONST_SUFFIX /* a3 = W1 | (W3 << 16) */ /* a4 = W5 | (W7 << 16) */ rsb v3, v5, v3, lsl #1 /* A1b = 2*A1b - A2b */ rsb v1, v7, v1, lsl #1 /* A0b = 2*A0b - A3b */ rsb v4, v6, v4, lsl #1 /* A1t = 2*A1t - A2t */ rsb v2, v8, v2, lsl #1 /* A0t = 2*A0t - A3t */ ldr ip, [a1, #(16*5 - 4)] /* ip = col_t[5]:col_b[5] */ ldr a2, m51 /* a2 = ((-W5 & 0xFFFF) | ((-W1 & 0xFFFF) << 16)) */ stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8} smulbb v1, a3, lr /* B0b = W1*col_b[1] */ smulbt v2, a3, lr /* B0t = W1*col_t[1] */ smultb v3, a3, lr /* B1b = W3*col_b[1] */ smultt v4, a3, lr /* B1t = W3*col_t[1] */ smulbb v5, a4, lr /* B2b = W5*col_b[1] */ smulbt v6, a4, lr /* B2t = W5*col_t[1] */ smultb v7, a4, lr /* B3b = W7*col_b[1] */ smultt v8, a4, lr /* B3t = W7*col_t[1] */ ldr lr, [a1, #(16*7 - 4)] /* lr = col_t[7]:col_b[7] */ cmp ip, #0 beq 2f /* jump probability is typically more than 75% */ smlabt v2, a4, ip, v2 /* B0t += W5*col_t[5] */ smlatt v4, a2, ip, v4 /* B1t -= W1*col_t[5] */ smlatt v6, a4, ip, v6 /* B2t += W7*col_t[5] */ smlatt v8, a3, ip, v8 /* B3t += W3*col_t[5] */ smlabb v1, a4, ip, v1 /* B0b += W5*col_b[5] */ smlatb v3, a2, ip, v3 /* B1b -= W1*col_b[5] */ smlatb v5, a4, ip, v5 /* B2b += W7*col_b[5] */ smlatb v7, a3, ip, v7 /* B3b += W3*col_b[5] */ 2: ldr ip, [a1, #(16*3 - 4)] /* ip = col_t[3]:col_b[3] */ cmp lr, #0 beq 3f /* jump probability is typically more than 90% */ smlatt v2, a4, lr, v2 /* B0t += W7*col_t[7] */ smlabt v4, a2, lr, v4 /* B1t -= W5*col_t[7] */ smlatt v6, a3, lr, v6 /* B2t += W3*col_t[7] */ smlatt v8, a2, lr, v8 /* B3t -= W1*col_t[7] */ smlatb v1, a4, lr, v1 /* B0b += W7*col_b[7] */ smlabb v3, a2, lr, v3 /* B1b -= W5*col_b[7] */ smlatb v5, a3, lr, v5 /* B2b += W3*col_b[7] */ smlatb v7, a2, lr, v7 /* B3b -= W1*col_b[7] */ 3: cmp ip, #0 beq 4f /* jump probability is typically more than 65% */ ldr a4, m7 smlatt v2, a3, ip, v2 /* B0t += W3*col_t[3] */ smlatt v6, a2, ip, v6 /* B2t -= W1*col_t[3] */ smlabt v8, a2, ip, v8 /* B3t -= W5*col_t[3] */ smlabt v4, a4, ip, v4 /* B1t -= W7*col_t[3] */ smlatb v1, a3, ip, v1 /* B0b += W3*col_b[3] */ smlatb v5, a2, ip, v5 /* B2b -= W1*col_b[3] */ smlabb v7, a2, ip, v7 /* B3b -= W5*col_b[3] */ smlabb v3, a4, ip, v3 /* B1b -= W7*col_b[3] */ 4: .endm /******************************************************************************/ /* * a local pool with 64-bit constants for 'simple_idct_put_armv5te' function, * we align it at 16 byte boundary in order to ensure that it does not cross * cache line boundary (occupies only a single cache line) */ .balign 16 w2266simple_idct_put_armv5te: .long W22 .long W66 w1357simple_idct_put_armv5te: .long W13 .long W57 .balign 32 .global simple_idct_put_armv5te .type simple_idct_put_armv5te, %function .func simple_idct_put_armv5te simple_idct_put_armv5te: idct_stackalign_armv5te stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, lr} strd a1, [sp, #-12]! mov a1, a3 bl idct_rows_armv5te add a2, a1, #16 strd a1, [sp, #-8]! 1: idct_two_col_armv5te simple_idct_put_armv5te str a1, [sp, #(0 + 32)] ldrd a3, [sp, #(8 + 32)] ldr lr, simple_idct_croptbl_armv5te ldrd a1, [sp], #8 add ip, a3, #2 str ip, [sp, #(8 + 32 - 8)] add ip, a1, v1 sub v1, a1, v1 add a1, a2, v2 sub v2, a2, v2 ldrb a1, [lr, a1, asr #COL_SHIFT] ldrb ip, [lr, ip, asr #COL_SHIFT] ldrb v2, [lr, v2, asr #COL_SHIFT] ldrb v1, [lr, v1, asr #COL_SHIFT] orr ip, ip, a1, asl #8 ldrd a1, [sp], #8 orr v1, v1, v2, asl #8 strh ip, [a3], a4 add ip, a1, v3 sub v3, a1, v3 add a1, a2, v4 sub v4, a2, v4 ldrb a1, [lr, a1, asr #COL_SHIFT] ldrb ip, [lr, ip, asr #COL_SHIFT] ldrb v4, [lr, v4, asr #COL_SHIFT] ldrb v3, [lr, v3, asr #COL_SHIFT] orr ip, ip, a1, asl #8 ldrd a1, [sp], #8 orr v3, v3, v4, asl #8 strh ip, [a3], a4 add ip, a1, v5 sub v5, a1, v5 add a1, a2, v6 sub v6, a2, v6 ldrb a1, [lr, a1, asr #COL_SHIFT] ldrb ip, [lr, ip, asr #COL_SHIFT] ldrb v6, [lr, v6, asr #COL_SHIFT] ldrb v5, [lr, v5, asr #COL_SHIFT] orr ip, ip, a1, asl #8 ldrd a1, [sp], #8 orr v5, v5, v6, asl #8 strh ip, [a3], a4 add ip, a1, v7 sub v7, a1, v7 add a1, a2, v8 sub v8, a2, v8 ldrb a1, [lr, a1, asr #COL_SHIFT] ldrb ip, [lr, ip, asr #COL_SHIFT] ldrb v8, [lr, v8, asr #COL_SHIFT] ldrb v7, [lr, v7, asr #COL_SHIFT] orr ip, ip, a1, asl #8 strh ip, [a3], a4 ldrd a1, [sp, #0] orr v7, v7, v8, asl #8 strh v7, [a3], a4 strh v5, [a3], a4 cmp a1, a2 strh v3, [a3], a4 strh v1, [a3], a4 bne 1b add sp, sp, #20 ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, pc} .endfunc /******************************************************************************/ /* * a local pool with 64-bit constants for 'simple_idct_add_armv5te' function, we * align it at 16 byte boundary in order to ensure that it does not cross * cache line boundary (occupies only a single cache line) */ .balign 16 w2266simple_idct_add_armv5te: .long W22 .long W66 w1357simple_idct_add_armv5te: .long W13 .long W57 .balign 32 .global simple_idct_add_armv5te .type simple_idct_add_armv5te, %function .func simple_idct_add_armv5te simple_idct_add_armv5te: idct_stackalign_armv5te stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, lr} strd a1, [sp, #-12]! mov a1, a3 bl idct_rows_armv5te add a2, a1, #16 strd a1, [sp, #-8]! sub sp, sp, #8 1: idct_two_col_armv5te simple_idct_add_armv5te ldrd a3, [sp, #(8 + 40)] str a1, [sp, #(0 + 40)] ldrd a1, [sp], #8 add ip, a3, #2 str ip, [sp, #(8 + 40 - 8)] add ip, a1, v1 sub v1, a1, v1 add a1, a2, v2 sub v2, a2, v2 strd v1, [sp, #(32 - 8)] /* save v1 and v2 to stack in order to use them as temporary registers */ ldrb v1, [a3, #1] ldrb v2, [a3] ldr lr, simple_idct_croptbl_armv5te add v1, v1, a1, asr #COL_SHIFT ldrd a1, [sp], #8 add ip, v2, ip, asr #COL_SHIFT ldrb v2, [lr, v1] ldrb ip, [lr, ip] add v1, a1, v3 sub v3, a1, v3 ldrb a1, [a3, a4] orr ip, ip, v2, asl #8 strh ip, [a3], a4 ldrb v2, [a3, #1] add ip, a2, v4 sub v4, a2, v4 add ip, v2, ip, asr #COL_SHIFT add v1, a1, v1, asr #COL_SHIFT ldrb v2, [lr, ip] ldrb ip, [lr, v1] ldrb v1, [a3, a4] ldrd a1, [sp], #8 orr ip, ip, v2, asl #8 strh ip, [a3], a4 ldrb v2, [a3, #1] add ip, a1, v5 sub v5, a1, v5 add a1, a2, v6 sub v6, a2, v6 add a1, v2, a1, asr #COL_SHIFT add ip, v1, ip, asr #COL_SHIFT ldrb v2, [lr, a1] ldrb ip, [lr, ip] ldrb v1, [a3, a4] ldrd a1, [sp], #8 orr ip, ip, v2, asl #8 strh ip, [a3], a4 ldrb v2, [a3, #1] add ip, a1, v7 sub v7, a1, v7 add a1, a2, v8 sub v8, a2, v8 add a1, v2, a1, asr #COL_SHIFT add ip, v1, ip, asr #COL_SHIFT ldrb v2, [lr, a1] ldrb ip, [lr, ip] ldrb v1, [a3, a4] add a2, lr, v7, asr #COL_SHIFT orr ip, ip, v2, asl #8 strh ip, [a3], a4 ldrb v2, [a3, #1] add v8, lr, v8, asr #COL_SHIFT mov v7, a3 /* a good news, now we have two more spare registers v7 and v8 */ ldrb ip, [a2, v1] ldrb v8, [v8, v2] ldrb v1, [v7, a4]! ldrb v2, [v7, #1] orr ip, ip, v8, asl #8 strh ip, [a3], a4 ldrb a1, [v7, a4]! ldrb a2, [v7, #1] add v6, v2, v6, asr #COL_SHIFT add v5, v1, v5, asr #COL_SHIFT ldrb v6, [lr, v6] ldrb v5, [lr, v5] ldrd v1, [sp, #0] /* restore v1 and v2 that were saved earlier */ orr v5, v5, v6, asl #8 strh v5, [a3], a4 ldrb v5, [v7, a4]! ldrb v6, [v7, #1] add v4, a2, v4, asr #COL_SHIFT add v3, a1, v3, asr #COL_SHIFT ldrb v4, [lr, v4] ldrb v3, [lr, v3] ldrd a1, [sp, #8] add v2, v6, v2, asr #COL_SHIFT add v1, v5, v1, asr #COL_SHIFT ldrb v2, [lr, v2] ldrb v1, [lr, v1] cmp a1, a2 orr v3, v3, v4, asl #8 strh v3, [a3], a4 orr v1, v1, v2, asl #8 strh v1, [a3], a4 bne 1b add sp, sp, #28 ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, pc} .endfunc /******************************************************************************/ /* * a local pool with 64-bit constants for 'simple_idct_armv5te' function, we * align it at 16 byte boundary in order to ensure that it does not cross * cache line boundary (occupies only a single cache line) */ .balign 16 w2266simple_idct_armv5te: .long W22 .long W66 w1357simple_idct_armv5te: .long W13 .long W57 .balign 32 .global simple_idct_armv5te .type simple_idct_armv5te, %function .func simple_idct_armv5te simple_idct_armv5te: idct_stackalign_armv5te stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, lr} strd a1, [sp, #-12]! bl idct_rows_armv5te add a2, a1, #16 str a2, [sp, #-8]! 1: idct_two_col_armv5te simple_idct_armv5te ldr lr, [sp, #32] ldrd a3, [sp], #8 cmp lr, a1 add a2, a3, v1 add ip, a4, v2 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*0 - 4)] strh ip, [a1, #(16*0 + 2 - 4)] sub a2, a3, v1 sub ip, a4, v2 ldrd a3, [sp], #8 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*7 - 4)] strh ip, [a1, #(16*7 + 2 - 4)] add a2, a3, v3 add ip, a4, v4 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*1 - 4)] strh ip, [a1, #(16*1 + 2 - 4)] sub a2, a3, v3 sub ip, a4, v4 ldrd a3, [sp], #8 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*6 - 4)] strh ip, [a1, #(16*6 + 2 - 4)] add a2, a3, v5 add ip, a4, v6 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*2 - 4)] strh ip, [a1, #(16*2 + 2 - 4)] sub a2, a3, v5 sub ip, a4, v6 ldrd a3, [sp], #8 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*5 - 4)] strh ip, [a1, #(16*5 + 2 - 4)] add a2, a3, v7 add ip, a4, v8 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*3 - 4)] strh ip, [a1, #(16*3 + 2 - 4)] sub a2, a3, v7 sub ip, a4, v8 mov a2, a2, asr #COL_SHIFT mov ip, ip, asr #COL_SHIFT strh a2, [a1, #(16*4 - 4)] strh ip, [a1, #(16*4 + 2 - 4)] bne 1b add sp, sp, #20 ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, v8, pc} .endfunc /******************************************************************************/ unaligned_return_thunk_armv5te: ldr pc, [sp], #4