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