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129 lines
3.8 KiB
129 lines
3.8 KiB
/*
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* Copyright (c) 2014 Advanced Micro Devices, Inc.
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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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#include <clc/clc.h>
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#include "config.h"
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#include "../clcmacro.h"
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#include "math.h"
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_CLC_DEF _CLC_OVERLOAD float __clc_ldexp(float x, int n) {
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if (!__clc_fp32_subnormals_supported()) {
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// This treats subnormals as zeros
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int i = as_int(x);
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int e = (i >> 23) & 0xff;
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int m = i & 0x007fffff;
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int s = i & 0x80000000;
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int v = add_sat(e, n);
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v = clamp(v, 0, 0xff);
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int mr = e == 0 | v == 0 | v == 0xff ? 0 : m;
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int c = e == 0xff;
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mr = c ? m : mr;
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int er = c ? e : v;
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er = e ? er : e;
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return as_float( s | (er << 23) | mr );
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}
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/* supports denormal values */
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const int multiplier = 24;
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float val_f;
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uint val_ui;
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uint sign;
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int exponent;
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val_ui = as_uint(x);
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sign = val_ui & 0x80000000;
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val_ui = val_ui & 0x7fffffff;/* remove the sign bit */
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int val_x = val_ui;
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exponent = val_ui >> 23; /* get the exponent */
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int dexp = exponent;
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/* denormal support */
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int fbh = 127 - (as_uint((float)(as_float(val_ui | 0x3f800000) - 1.0f)) >> 23);
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int dexponent = 25 - fbh;
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uint dval_ui = (( (val_ui << fbh) & 0x007fffff) | (dexponent << 23));
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int ex = dexponent + n - multiplier;
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dexponent = ex;
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uint val = sign | (ex << 23) | (dval_ui & 0x007fffff);
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int ex1 = dexponent + multiplier;
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ex1 = -ex1 +25;
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dval_ui = (((dval_ui & 0x007fffff )| 0x800000) >> ex1);
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dval_ui = dexponent > 0 ? val :dval_ui;
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dval_ui = dexponent > 254 ? 0x7f800000 :dval_ui; /*overflow*/
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dval_ui = dexponent < -multiplier ? 0 : dval_ui; /*underflow*/
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dval_ui = dval_ui | sign;
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val_f = as_float(dval_ui);
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exponent += n;
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val = sign | (exponent << 23) | (val_ui & 0x007fffff);
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ex1 = exponent + multiplier;
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ex1 = -ex1 +25;
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val_ui = (((val_ui & 0x007fffff )| 0x800000) >> ex1);
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val_ui = exponent > 0 ? val :val_ui;
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val_ui = exponent > 254 ? 0x7f800000 :val_ui; /*overflow*/
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val_ui = exponent < -multiplier ? 0 : val_ui; /*underflow*/
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val_ui = val_ui | sign;
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val_ui = dexp == 0? dval_ui : val_ui;
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val_f = as_float(val_ui);
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val_f = isnan(x) | isinf(x) | val_x == 0 ? x : val_f;
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return val_f;
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}
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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_CLC_DEF _CLC_OVERLOAD double __clc_ldexp(double x, int n) {
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long l = as_ulong(x);
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int e = (l >> 52) & 0x7ff;
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long s = l & 0x8000000000000000;
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ulong ux = as_ulong(x * 0x1.0p+53);
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int de = ((int)(ux >> 52) & 0x7ff) - 53;
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int c = e == 0;
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e = c ? de: e;
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ux = c ? ux : l;
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int v = e + n;
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v = clamp(v, -0x7ff, 0x7ff);
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ux &= ~EXPBITS_DP64;
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double mr = as_double(ux | ((ulong)(v+53) << 52));
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mr = mr * 0x1.0p-53;
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mr = v > 0 ? as_double(ux | ((ulong)v << 52)) : mr;
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mr = v == 0x7ff ? as_double(s | PINFBITPATT_DP64) : mr;
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mr = v < -53 ? as_double(s) : mr;
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mr = ((n == 0) | isinf(x) | (x == 0) ) ? x : mr;
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return mr;
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}
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#endif
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