📄 motion_est_mvi_asm.s
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/* * Alpha optimized DSP utils * Copyright (c) 2002 Falk Hueffner <falk@debian.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */#include "regdef.h"#ifdef HAVE_AV_CONFIG_H #include "config.h"#endif/* Some nicer register names. */#define ta t10#define tb t11#define tc t12#define td AT/* Danger: these overlap with the argument list and the return value */#define te a5#define tf a4#define tg a3#define th v0 .set noat .set noreorder .arch pca56 .text/***************************************************************************** * int pix_abs16x16_mvi_asm(uint8_t *pix1, uint8_t *pix2, int line_size) * * This code is written with a pca56 in mind. For ev6, one should * really take the increased latency of 3 cycles for MVI instructions * into account. * * It is important to keep the loading and first use of a register as * far apart as possible, because if a register is accessed before it * has been fetched from memory, the CPU will stall. */ .align 4 .globl pix_abs16x16_mvi_asm .ent pix_abs16x16_mvi_asmpix_abs16x16_mvi_asm: .frame sp, 0, ra, 0 .prologue 0#ifdef HAVE_GPROF lda AT, _mcount jsr AT, (AT), _mcount#endif and a1, 7, t0 clr v0 lda a3, 16 beq t0, $aligned .align 4$unaligned: /* Registers: line 0: t0: left_u -> left lo -> left t1: mid t2: right_u -> right hi -> right t3: ref left t4: ref right line 1: t5: left_u -> left lo -> left t6: mid t7: right_u -> right hi -> right t8: ref left t9: ref right temp: ta: left hi tb: right lo tc: error left td: error right */ /* load line 0 */ ldq_u t0, 0(a1) # left_u ldq_u t1, 8(a1) # mid ldq_u t2, 16(a1) # right_u ldq t3, 0(a0) # ref left ldq t4, 8(a0) # ref right addq a0, a2, a0 # pix1 addq a1, a2, a1 # pix2 /* load line 1 */ ldq_u t5, 0(a1) # left_u ldq_u t6, 8(a1) # mid ldq_u t7, 16(a1) # right_u ldq t8, 0(a0) # ref left ldq t9, 8(a0) # ref right addq a0, a2, a0 # pix1 addq a1, a2, a1 # pix2 /* calc line 0 */ extql t0, a1, t0 # left lo extqh t1, a1, ta # left hi extql t1, a1, tb # right lo or t0, ta, t0 # left extqh t2, a1, t2 # right hi perr t3, t0, tc # error left or t2, tb, t2 # right perr t4, t2, td # error right addq v0, tc, v0 # add error left addq v0, td, v0 # add error left /* calc line 1 */ extql t5, a1, t5 # left lo extqh t6, a1, ta # left hi extql t6, a1, tb # right lo or t5, ta, t5 # left extqh t7, a1, t7 # right hi perr t8, t5, tc # error left or t7, tb, t7 # right perr t9, t7, td # error right addq v0, tc, v0 # add error left addq v0, td, v0 # add error left /* loop */ subq a3, 2, a3 # h -= 2 bne a3, $unaligned ret .align 4$aligned: /* load line 0 */ ldq t0, 0(a1) # left ldq t1, 8(a1) # right addq a1, a2, a1 # pix2 ldq t2, 0(a0) # ref left ldq t3, 8(a0) # ref right addq a0, a2, a0 # pix1 /* load line 1 */ ldq t4, 0(a1) # left ldq t5, 8(a1) # right addq a1, a2, a1 # pix2 ldq t6, 0(a0) # ref left ldq t7, 8(a0) # ref right addq a0, a2, a0 # pix1 /* load line 2 */ ldq t8, 0(a1) # left ldq t9, 8(a1) # right addq a1, a2, a1 # pix2 ldq ta, 0(a0) # ref left ldq tb, 8(a0) # ref right addq a0, a2, a0 # pix1 /* load line 3 */ ldq tc, 0(a1) # left ldq td, 8(a1) # right addq a1, a2, a1 # pix2 ldq te, 0(a0) # ref left ldq tf, 8(a0) # ref right /* calc line 0 */ perr t0, t2, t0 # error left addq a0, a2, a0 # pix1 perr t1, t3, t1 # error right addq v0, t0, v0 # add error left /* calc line 1 */ perr t4, t6, t0 # error left addq v0, t1, v0 # add error right perr t5, t7, t1 # error right addq v0, t0, v0 # add error left /* calc line 2 */ perr t8, ta, t0 # error left addq v0, t1, v0 # add error right perr t9, tb, t1 # error right addq v0, t0, v0 # add error left /* calc line 3 */ perr tc, te, t0 # error left addq v0, t1, v0 # add error right perr td, tf, t1 # error right addq v0, t0, v0 # add error left addq v0, t1, v0 # add error right /* loop */ subq a3, 4, a3 # h -= 4 bne a3, $aligned ret .end pix_abs16x16_mvi_asm⌨️ 快捷键说明
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