| Thomas Tsou | 7e4e536 | 2013-10-30 21:18:55 -0400 | [diff] [blame] | 1 | /* |
| 2 | * ARM NEON Scaling |
| 3 | * Copyright (C) 2013 Thomas Tsou <tom@tsou.cc> |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | .syntax unified |
| 21 | .text |
| 22 | .align 2 |
| 23 | .global neon_scale_4n |
| 24 | .type neon_scale_4n, %function |
| 25 | neon_scale_4n: |
| 26 | push {r4, lr} |
| 27 | ldr r4, =32 |
| 28 | |
| 29 | vld1.64 d0, [r1] |
| 30 | vmov.32 s4, s1 |
| 31 | vmov.32 s1, s0 |
| 32 | vmov.64 d1, d0 |
| 33 | vmov.32 s5, s4 |
| 34 | vmov.64 d3, d2 |
| 35 | .loop_mul_const: |
| 36 | vld2.32 {q2-q3}, [r0], r4 |
| 37 | |
| 38 | vmul.f32 q8, q0, q2 |
| 39 | vmul.f32 q9, q1, q3 |
| 40 | vmul.f32 q10, q0, q3 |
| 41 | vmul.f32 q11, q1, q2 |
| 42 | vsub.f32 q8, q8, q9 |
| 43 | vadd.f32 q9, q10, q11 |
| 44 | |
| 45 | vst2.32 {q8-q9}, [r2]! |
| 46 | subs r3, #1 |
| 47 | bne .loop_mul_const |
| 48 | pop {r4, pc} |
| 49 | .size neon_scale_4n, .-neon_scale_4n |
| 50 | .section .note.GNU-stack,"",%progbits |