d12a8da1de
These functions are "shared" between integer and floating-point types, hence the directory name. They are used in several CLC internal functions such as __clc_ldexp. Note that clspv and spirv targets don't want to define these functions, so pre-processor macros replace calls to __clc_min with regular min, for example. This means they can use as much of the generic CLC source files as possible, but where CLC functions would usually call out to an external __clc_min symbol, they call out to an external min symbol. Then they opt out of defining __clc_min itself in their CLC builtins library. Preprocessor definitions for these targets have also been changed somewhat: what used to be CLC_SPIRV (the 32-bit target) is now CLC_SPIRV32, and CLC_SPIRV now represents either CLC_SPIRV32 or CLC_SPIRV64. Same goes for CLC_CLSPV. There are no differences (measured with llvm-diff) in any of the final builtins libraries for nvptx, amdgpu, or clspv. Neither are there differences in the SPIR-V targets' LLVM IR before it's actually lowered to SPIR-V.
143 lines
4.2 KiB
Common Lisp
143 lines
4.2 KiB
Common Lisp
/*
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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 "../clcmacro.h"
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#include "config.h"
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#include "math.h"
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#include <clc/clc.h>
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#include <clc/shared/clc_clamp.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 = __clc_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 =
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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 = __clc_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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#ifdef cl_khr_fp16
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#pragma OPENCL EXTENSION cl_khr_fp16 : enable
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_CLC_OVERLOAD _CLC_DEF half __clc_ldexp(half x, int n) {
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return (half)__clc_ldexp((float)x, n);
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}
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_CLC_BINARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, half, __clc_ldexp, half, int);
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#endif
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