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/*
* Copyright (c) 2014 Advanced Micro Devices, Inc.
*
* Copyright (c) 2017 Michal Babej / Tampere University of Technology
*
* 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.
*/
_CL_OVERLOADABLE vtype sinpi(vtype x)
{
itype ix = as_itype(x);
itype xsgn = ix & (itype)SIGNBIT_SP32;
ix ^= xsgn;
vtype ax = as_vtype(ix);
vtype iaxv = trunc(ax);
itype iaxi = convert_itype(iaxv);
vtype r = ax - iaxv;
itype xodd = xsgn ^ ((iaxi & (itype)0x1) << 31);
// Initialize with return for +-Inf and NaN
itype ir = (itype)QNANBITPATT_SP32;
// 2^23 <= |x| < Inf, the result is always integer
ir = (ix < (itype)(EXPBITS_SP32)) ? xsgn : ir;
// 0x1.0p-7 <= |x| < 2^23, result depends on which 0.25 interval
// r < 1.0
vtype a = ((vtype)1.0f - r);
itype e = (itype)0;
// r <= 0.75
itype c = (r <= (vtype)0.75f);
a = c ? (r - (vtype)0.5f) : a;
e = c ? (itype)(-1) : e;
// r < 0.5
c = (r < (vtype)0.5f);
a = c ? ((vtype)0.5f - r) : a;
// r <= 0.25
c = (r <= 0.25f);
a = c ? r : a;
e = c ? (itype)0 : e;
v2type t = __pocl_sincosf_piby4(a * M_PI_F);
itype jr = xodd ^ as_itype(e ? t.hi : t.lo);
ir = (ix < (itype)0x4b000000) ? jr : ir;
return as_vtype(ir);
}
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