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Implement log10

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v2: Use constant and multiplication instead of division
v3: Use hex constants

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 227585
This commit is contained in:
Jan Vesely 2015-01-30 18:00:34 +00:00
parent 206d1160ce
commit 51702e6e75
5 changed files with 32 additions and 0 deletions
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1
libclc/generic/include/clc/clc.h
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@ -50,6 +50,7 @@
#include <clc/math/fmod.h>
#include <clc/math/hypot.h>
#include <clc/math/log.h>
#include <clc/math/log10.h>
#include <clc/math/log1p.h>
#include <clc/math/log2.h>
#include <clc/math/mad.h>

9
libclc/generic/include/clc/math/log10.h Normal file
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@ -0,0 +1,9 @@
#undef log10
#define __CLC_BODY <clc/math/unary_decl.inc>
#define __CLC_FUNCTION log10
#include <clc/math/gentype.inc>
#undef __CLC_BODY
#undef __CLC_FUNCTION

1
libclc/generic/lib/SOURCES
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@ -63,6 +63,7 @@ math/fmax.cl
math/fmin.cl
math/fmod.cl
math/hypot.cl
math/log10.cl
math/log1p.cl
math/mad.cl
math/mix.cl

8
libclc/generic/lib/math/log10.cl Normal file
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@ -0,0 +1,8 @@
#include <clc/clc.h>
#ifdef cl_khr_fp64
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
#endif
#define __CLC_BODY <log10.inc>
#include <clc/math/gentype.inc>

13
libclc/generic/lib/math/log10.inc Normal file
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@ -0,0 +1,13 @@
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE log10(__CLC_GENTYPE val) {
// log10(x) = log2(x) / log2(10)
// 1 / log2(10) = 0.30102999566 = log10(2)
// SP representation is 0.30103 (0x1.344136p-2)
// DP representation is 0.301029995659999993762312442414(0x1.34413509E61D8p-2)
#if __CLC_FPSIZE == 32
return log2(val) * 0x1.344136p-2f;
#elif __CLC_FPSIZE == 64
return log2(val) * 0x1.34413509E61D8p-2;
#else
#error unknown _CLC_FPSIZE
#endif
}