72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
/*
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* Copyright (c) 2014 Advanced Micro Devices, Inc.
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* Copyright (c) 2016 Aaron Watry
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*
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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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*
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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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*
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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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#if __CLC_FPSIZE == 32
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#ifdef __CLC_SCALAR
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_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, __CLC_GENTYPE y) {
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if (__builtin_isnan(x) || __builtin_isnan(y))
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return as_float(QNANBITPATT_SP32);
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return fmax(x - y, 0.0f);
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}
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#define __CLC_FDIM_VEC(width) \
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_CLC_OVERLOAD _CLC_DEF float##width fdim(float##width x, float##width y) { \
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/* Determine if x or y is NaN. */ \
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/* Vector true is -1, i.e. all-bits-set, and NaN==NaN is false. */ \
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/* If either is NaN, then ~((x==x) & (y==y)) will be 0 (e.g. ~(-1)), as will n. */ \
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int##width n = ~((x == x) & (y == y)) & QNANBITPATT_SP32; \
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/* Calculate x-y if x>y, otherwise positive 0, again taking */ \
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/* advantage of vector true being all-bits-set. */ \
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int##width r = (x > y) & as_int##width(x - y); \
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return as_float##width(n | r); \
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}
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__CLC_FDIM_VEC(2)
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__CLC_FDIM_VEC(3)
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__CLC_FDIM_VEC(4)
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__CLC_FDIM_VEC(8)
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__CLC_FDIM_VEC(16)
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#undef __CLC_FDIM_VEC
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#endif
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#endif
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#if __CLC_FPSIZE == 64
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#ifdef __CLC_SCALAR
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_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, private __CLC_GENTYPE y) {
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long n = -(isnan(x) | isnan(y)) & QNANBITPATT_DP64;
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long r = -(x > y) & as_long(x - y);
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return as_double(n | r);
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}
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#define __CLC_FDIM_VEC(width) \
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_CLC_OVERLOAD _CLC_DEF double##width fdim(double##width x, double##width y) { \
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/* See comment in float implementation for explanation. */ \
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long##width n = ~((x == x) & (y == y)) & QNANBITPATT_DP64; \
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long##width r = (x > y) & as_long##width(x - y); \
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return as_double##width(n | r); \
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}
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__CLC_FDIM_VEC(2)
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__CLC_FDIM_VEC(3)
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__CLC_FDIM_VEC(4)
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__CLC_FDIM_VEC(8)
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__CLC_FDIM_VEC(16)
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#undef __CLC_FDIM_VEC
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#endif
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#endif
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