mirror of
https://github.com/libretro/RetroArch
synced 2025-02-03 08:54:13 +00:00
c8067ba0c0
* Squashed 'deps/math-neon/' content from commit 0050735 git-subtree-dir: deps/math-neon git-subtree-split: 0050735ae8f18281c1e6fbe2dc80546e402b7fc5 * Squashed 'deps/vitaGL/' content from commit 694b387 git-subtree-dir: deps/vitaGL git-subtree-split: 694b387a6eacf7e179f07ff621e5772ae4253315 * (Vita) Add baked math-neon and vitaGL
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
|
|
The MIT License (MIT)
|
|
|
|
Copyright (c) 2015 Lachlan Tychsen-Smith (lachlan.ts@gmail.com)
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
*/
|
|
|
|
#include "math.h"
|
|
#include "math_neon.h"
|
|
|
|
/*
|
|
TanH = (e^x - e^-x) / (e^x + e^-x)
|
|
TanH = (e^x - e^-x)(e^x) / (e^x + e^-x)(e^x)
|
|
TanH = (e^2x - 1) / (e^2x + 1)
|
|
|
|
*/
|
|
|
|
float tanhf_c(float x)
|
|
{
|
|
float a, b, c;
|
|
int m;
|
|
union{
|
|
float f;
|
|
int i;
|
|
} xx;
|
|
|
|
x = 2.0f * x;
|
|
a = expf_c(x);
|
|
c = a + 1.0f;
|
|
|
|
//reciporical approx.
|
|
xx.f = c;
|
|
m = 0x3F800000 - (xx.i & 0x7F800000);
|
|
xx.i = xx.i + m;
|
|
xx.f = 1.41176471f - 0.47058824f * xx.f;
|
|
xx.i = xx.i + m;
|
|
b = 2.0 - xx.f * c;
|
|
xx.f = xx.f * b;
|
|
b = 2.0 - xx.f * c;
|
|
xx.f = xx.f * b;
|
|
c = a - 1.0;
|
|
xx.f *= c;
|
|
return xx.f;
|
|
}
|
|
|
|
|
|
float tanhf_neon_hfp(float x)
|
|
{
|
|
#ifdef __MATH_NEON
|
|
asm volatile ("vadd.f32 d0, d0, d0 \n\t");
|
|
expf_neon_hfp(x);
|
|
asm volatile (
|
|
"vmov.f32 d2, #1.0 \n\t"
|
|
"vsub.f32 d3, d0, d2 \n\t"
|
|
"vadd.f32 d0, d0, d2 \n\t"
|
|
|
|
"vrecpe.f32 d1, d0 \n\t" //d1 = ~ 1 / d0;
|
|
"vrecps.f32 d2, d1, d0 \n\t" //d2 = 2.0 - d1 * d0;
|
|
"vmul.f32 d1, d1, d2 \n\t" //d1 = d1 * d2;
|
|
"vrecps.f32 d2, d1, d0 \n\t" //d2 = 2.0 - d1 * d0;
|
|
"vmul.f32 d0, d1, d2 \n\t" //d0 = d1 * d2;
|
|
"vmul.f32 d0, d0, d3 \n\t" //d0 = d0 * d3;
|
|
::: "d0", "d1", "d2", "d3"
|
|
);
|
|
#endif
|
|
}
|
|
|
|
float tanhf_neon_sfp(float x)
|
|
{
|
|
#ifdef __MATH_NEON
|
|
asm volatile ("vmov.f32 s0, r0 \n\t");
|
|
tanhf_neon_hfp(x);
|
|
asm volatile ("vmov.f32 r0, s0 \n\t");
|
|
#else
|
|
return tanhf_c(x);
|
|
#endif
|
|
};
|
|
|