| /* |
| * Copyright (c) 2014 Advanced Micro Devices, Inc. |
| * |
| * 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 "math32.h" |
| #include "sincospiF_piby4.h" |
| #if !defined(SUBNORMALS_SUPPORTED) |
| #include "floattointconversion.h" |
| #endif //SUBNORMALS_SUPPORTED |
| |
| |
| __attribute__((overloadable)) float |
| sinpi(float x) |
| { |
| const float pi = 3.1415926535897932F; |
| |
| int ix = as_int(x); |
| int xsgn = ix & 0x80000000; |
| ix ^= xsgn; |
| float ax = as_float(ix); |
| int iax = (int)ax; |
| float r = ax - iax; |
| int xodd = xsgn ^ (iax & 0x1 ? 0x80000000 : 0); |
| |
| // Initialize with return for +-Inf and NaN |
| int ir = 0x7fc00000; |
| |
| // 2^23 <= |x| < Inf, the result is always integer |
| ir = ix < 0x7f800000 ? xsgn : ir; |
| |
| // 0x1.0p-7 <= |x| < 2^23, result depends on which 0.25 interval |
| |
| // r < 1.0 |
| float a = 1.0f - r; |
| int e = 0; |
| |
| // r <= 0.75 |
| int c = r <= 0.75f; |
| a = c ? r - 0.5f : a; |
| e = c ? 1 : e; |
| |
| // r < 0.5 |
| c = r < 0.5f; |
| a = c ? 0.5f - r : a; |
| |
| // 0 < r <= 0.25 |
| c = r <= 0.25f; |
| a = c ? r : a; |
| e = c ? 0 : e; |
| |
| float2 t = sincosf_piby4(a * pi); |
| int jr = xodd ^ as_int(e ? t.hi : t.lo); |
| |
| ir = ix < 0x4b000000 ? jr : ir; |
| |
| |
| #if !defined(SUBNORMALS_SUPPORTED) |
| if(ax <= 0.) |
| { |
| double d = float_uint_to_double(as_uint(x)); |
| ir = (double_to_float_uint(d*pi)); |
| } |
| #endif //SUBNORMALS_SUPPORTED |
| |
| return as_float(ir); |
| } |
| |