| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (float_to_s16_neon.S). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | #if defined(__ARM_NEON__) && defined(HAVE_ARM_NEON_ASM_OPTIMIZATIONS) |
| 23 | |
| 24 | #ifndef __MACH__ |
| 25 | .arm |
| 26 | #endif |
| 27 | |
| 28 | .align 4 |
| 29 | .globl convert_float_s16_asm |
| 30 | #ifndef __MACH__ |
| 31 | .type convert_float_s16_asm, %function |
| 32 | #endif |
| 33 | .globl _convert_float_s16_asm |
| 34 | #ifndef __MACH__ |
| 35 | .type _convert_float_s16_asm, %function |
| 36 | #endif |
| 37 | # convert_float_s16_asm(int16_t *out, const float *in, size_t samples) |
| 38 | convert_float_s16_asm: |
| 39 | _convert_float_s16_asm: |
| 40 | # Hacky way to get a constant of 2^15. |
| 41 | # ((2^4)^2)^2 * 0.5 = 2^15 |
| 42 | vmov.f32 q8, #16.0 |
| 43 | vmov.f32 q9, #0.5 |
| 44 | vmul.f32 q8, q8, q8 |
| 45 | vmul.f32 q8, q8, q8 |
| 46 | vmul.f32 q8, q8, q9 |
| 47 | |
| 48 | 1: |
| 49 | # Preload here? |
| 50 | vld1.f32 {q0-q1}, [r1]! |
| 51 | |
| 52 | vmul.f32 q0, q0, q8 |
| 53 | vmul.f32 q1, q1, q8 |
| 54 | |
| 55 | vcvt.s32.f32 q0, q0 |
| 56 | vcvt.s32.f32 q1, q1 |
| 57 | |
| 58 | vqmovn.s32 d4, q0 |
| 59 | vqmovn.s32 d5, q1 |
| 60 | |
| 61 | vst1.f32 {d4-d5}, [r0]! |
| 62 | |
| 63 | # Guaranteed to get samples in multiples of 8. |
| 64 | subs r2, r2, #8 |
| 65 | bne 1b |
| 66 | |
| 67 | bx lr |
| 68 | |
| 69 | #endif |