diff options
Diffstat (limited to 'generic/lib/math/fdim.inc')
-rw-r--r-- | generic/lib/math/fdim.inc | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/generic/lib/math/fdim.inc b/generic/lib/math/fdim.inc new file mode 100644 index 0000000..a67c76e --- /dev/null +++ b/generic/lib/math/fdim.inc @@ -0,0 +1,71 @@ +/* + * Copyright (c) 2014 Advanced Micro Devices, Inc. + * Copyright (c) 2016 Aaron Watry + * + * 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. + */ +#if __CLC_FPSIZE == 32 +#ifdef __CLC_SCALAR +_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, __CLC_GENTYPE y) { + if (__builtin_isnan(x) || __builtin_isnan(y)) + return as_float(QNANBITPATT_SP32); + return __builtin_fmax(x - y, 0); +} +#define __CLC_FDIM_VEC(width) \ +_CLC_OVERLOAD _CLC_DEF float##width fdim(float##width x, float##width y) { \ + /* Determine if x or y is NaN. */ \ + /* Vector true is -1, i.e. all-bits-set, and NaN==NaN is false. */ \ + /* If either is NaN, then ~((x==x) & (y==y)) will be 0 (e.g. ~(-1)), as will n. */ \ + int##width n = ~((x == x) & (y == y)) & QNANBITPATT_SP32; \ + /* Calculate x-y if x>y, otherwise positive 0, again taking */ \ + /* advantage of vector true being all-bits-set. */ \ + int##width r = (x > y) & as_int##width(x - y); \ + return as_float##width(n | r); \ +} +__CLC_FDIM_VEC(2) +__CLC_FDIM_VEC(3) +__CLC_FDIM_VEC(4) +__CLC_FDIM_VEC(8) +__CLC_FDIM_VEC(16) +#undef __CLC_FDIM_VEC +#endif +#endif + +#if __CLC_FPSIZE == 64 +#ifdef __CLC_SCALAR +_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, private __CLC_GENTYPE y) { + long n = -(isnan(x) | isnan(y)) & QNANBITPATT_DP64; + long r = -(x > y) & as_long(x - y); + return as_double(n | r); +} +#define __CLC_FDIM_VEC(width) \ +_CLC_OVERLOAD _CLC_DEF double##width fdim(double##width x, double##width y) { \ + /* See comment in float implementation for explanation. */ \ + long##width n = ~((x == x) & (y == y)) & QNANBITPATT_DP64; \ + long##width r = (x > y) & as_long##width(x - y); \ + return as_double##width(n | r); \ +} +__CLC_FDIM_VEC(2) +__CLC_FDIM_VEC(3) +__CLC_FDIM_VEC(4) +__CLC_FDIM_VEC(8) +__CLC_FDIM_VEC(16) +#undef __CLC_FDIM_VEC +#endif +#endif |