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R600: Implement accurate double precision sqrt v2

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v2:
  - Use same implementation for R600 and gcn.

llvm-svn: 241907
This commit is contained in:
Tom Stellard 2015-07-10 13:37:08 +00:00
parent 2ef5ec6b2b
commit 4f8d26230c
2 changed files with 60 additions and 0 deletions
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1
libclc/r600/lib/SOURCES
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@ -1,6 +1,7 @@
atomic/atomic.cl
math/ldexp.cl
math/nextafter.cl
math/sqrt.cl
workitem/get_num_groups.ll
workitem/get_group_id.ll
workitem/get_local_size.ll

59
libclc/r600/lib/math/sqrt.cl Normal file
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/*
* Copyright (c) 2015 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 "../../../generic/lib/clcmacro.h"
#include "math/clc_sqrt.h"
_CLC_DEFINE_UNARY_BUILTIN(float, sqrt, __clc_sqrt, float)
#ifdef cl_khr_fp64
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
_CLC_OVERLOAD _CLC_DEF double sqrt(double x) {
uint vcc = x < 0x1p-767;
uint exp0 = vcc ? 0x100 : 0;
unsigned exp1 = vcc ? 0xffffff80 : 0;
double v01 = ldexp(x, exp0);
double v23 = __builtin_amdgpu_rsq(v01);
double v45 = v01 * v23;
v23 = v23 * 0.5;
double v67 = fma(-v23, v45, 0.5);
v45 = fma(v45, v67, v45);
double v89 = fma(-v45, v45, v01);
v23 = fma(v23, v67, v23);
v45 = fma(v89, v23, v45);
v67 = fma(-v45, v45, v01);
v23 = fma(v67, v23, v45);
v23 = ldexp(v23, exp1);
return ((x == __builtin_inf()) || (x == 0.0)) ? v01 : v23;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sqrt, double);
#endif