mirror of
https://github.com/libretro/RetroArch
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119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*
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The MIT License (MIT)
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Copyright (c) 2015 Lachlan Tychsen-Smith (lachlan.ts@gmail.com)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "math_neon.h"
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//vec2 scalar product
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float
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dot2_c(float v0[2], float v1[2])
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{
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float r;
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r = v0[0]*v1[0];
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r += v0[1]*v1[1];
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return r;
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}
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void
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normalize2_c(float v[2], float d[2])
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{
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float b, c, x;
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union {
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float f;
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int i;
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} a;
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x = v[0]*v[0];
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x += v[1]*v[1];
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//fast invsqrt approx
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a.f = x;
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a.i = 0x5F3759DF - (a.i >> 1); //VRSQRTE
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c = x * a.f;
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b = (3.0f - c * a.f) * 0.5; //VRSQRTS
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a.f = a.f * b;
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c = x * a.f;
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b = (3.0f - c * a.f) * 0.5;
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a.f = a.f * b;
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d[0] = v[0]*a.f;
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d[1] = v[1]*a.f;
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}
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float
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dot2_neon_hfp(float v0[2], float v1[2])
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{
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#ifdef __MATH_NEON
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asm volatile (
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"vld1.32 {d2}, [%0] \n\t" //d2={x0,y0}
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"vld1.32 {d4}, [%1] \n\t" //d4={x1,y1}
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"vmul.f32 d0, d2, d4 \n\t" //d0 = d2*d4
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"vpadd.f32 d0, d0, d0 \n\t" //d0 = d[0] + d[1]
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:: "r"(v0), "r"(v1)
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:
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);
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#endif
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}
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float
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dot2_neon_sfp(float v0[2], float v1[2])
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{
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#ifdef __MATH_NEON
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dot2_neon_hfp(v0, v1);
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asm volatile ("vmov.f32 r0, s0 \n\t");
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#else
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return dot2_c(v0, v1);
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#endif
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};
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void
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normalize2_neon(float v[2], float d[2])
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{
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#ifdef __MATH_NEON
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asm volatile (
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"vld1.32 d4, [%0] \n\t" //d4 = {x0,y0}
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"vmul.f32 d0, d4, d4 \n\t" //d0 = d2*d2
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"vpadd.f32 d0, d0 \n\t" //d0 = d[0] + d[1]
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"vmov.f32 d1, d0 \n\t" //d1 = d0
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"vrsqrte.f32 d0, d0 \n\t" //d0 = ~ 1.0 / sqrt(d0)
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"vmul.f32 d2, d0, d1 \n\t" //d2 = d0 * d1
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"vrsqrts.f32 d3, d2, d0 \n\t" //d3 = (3 - d0 * d2) / 2
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"vmul.f32 d0, d0, d3 \n\t" //d0 = d0 * d3
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"vmul.f32 d2, d0, d1 \n\t" //d2 = d0 * d1
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"vrsqrts.f32 d3, d2, d0 \n\t" //d3 = (3 - d0 * d2) / 2
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"vmul.f32 d0, d0, d3 \n\t" //d0 = d0 * d3
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"vmul.f32 d4, d4, d0[0] \n\t" //d4 = d4*d0[0]
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"vst1.32 d4, [%1] \n\t" //
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:: "r"(v), "r"(d)
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: "d0", "d1", "d2", "d3", "d4", "memory"
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);
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#else
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normalize2_c(v, d);
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#endif
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}
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