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3719602c PC |
1 | /* Copyright (C) 2010-2020 The RetroArch team |
2 | * | |
3 | * --------------------------------------------------------------------------------------- | |
4 | * The following license statement only applies to this file (s16_to_float_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_s16_float_asm | |
30 | #ifndef __MACH__ | |
31 | .type convert_s16_float_asm, %function | |
32 | #endif | |
33 | .globl _convert_s16_float_asm | |
34 | #ifndef __MACH__ | |
35 | .type _convert_s16_float_asm, %function | |
36 | #endif | |
37 | # convert_s16_float_asm(float *out, const int16_t *in, size_t samples, const float *gain) | |
38 | convert_s16_float_asm: | |
39 | _convert_s16_float_asm: | |
40 | # Hacky way to get a constant of 2^-15. | |
41 | # Might be faster to just load a constant from memory. | |
42 | # It's just done once however ... | |
43 | vmov.f32 q8, #0.25 | |
44 | vmul.f32 q8, q8, q8 | |
45 | vmul.f32 q8, q8, q8 | |
46 | vmul.f32 q8, q8, q8 | |
47 | vadd.f32 q8, q8, q8 | |
48 | ||
49 | # Apply gain | |
50 | vld1.f32 {d6[0]}, [r3] | |
51 | vmul.f32 q8, q8, d6[0] | |
52 | ||
53 | 1: | |
54 | # Preload here? | |
55 | vld1.s16 {q0}, [r1]! | |
56 | ||
57 | # Widen to 32-bit | |
58 | vmovl.s16 q1, d0 | |
59 | vmovl.s16 q2, d1 | |
60 | ||
61 | # Convert to float | |
62 | vcvt.f32.s32 q1, q1 | |
63 | vcvt.f32.s32 q2, q2 | |
64 | ||
65 | vmul.f32 q1, q1, q8 | |
66 | vmul.f32 q2, q2, q8 | |
67 | ||
68 | vst1.f32 {q1-q2}, [r0]! | |
69 | ||
70 | # Guaranteed to get samples in multiples of 8. | |
71 | subs r2, r2, #8 | |
72 | bne 1b | |
73 | ||
74 | bx lr | |
75 | ||
76 | #endif |