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math: Add logb builtin 

Ported from the amd-builtins branch.

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Matt Arsenault <Matthew.Arsenault@amd.com>
CC: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 292335
This commit is contained in:
Aaron Watry 2017-01-18 03:14:10 +00:00
parent 900bd7eb7f
commit c606efabb7
5 changed files with 36 additions and 0 deletions
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1
libclc/generic/include/clc/clc.h
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@ -76,6 +76,7 @@
#include <clc/math/log10.h>
#include <clc/math/log1p.h>
#include <clc/math/log2.h>
#include <clc/math/logb.h>
#include <clc/math/mad.h>
#include <clc/math/modf.h>
#include <clc/math/nextafter.h>

2
libclc/generic/include/clc/math/logb.h Normal file
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@ -0,0 +1,2 @@
#define __CLC_BODY <clc/math/logb.inc>
#include <clc/math/gentype.inc>

1
libclc/generic/include/clc/math/logb.inc Normal file
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@ -0,0 +1 @@
_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE logb(__CLC_GENTYPE a);

1
libclc/generic/lib/SOURCES
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@ -104,6 +104,7 @@ math/log.cl
math/log10.cl
math/log1p.cl
math/log2.cl
math/logb.cl
math/mad.cl
math/modf.cl
math/native_log.cl

31
libclc/generic/lib/math/logb.cl Normal file
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@ -0,0 +1,31 @@
#include <clc/clc.h>
#include "math.h"
#include "../clcmacro.h"
_CLC_OVERLOAD _CLC_DEF float logb(float x) {
int ax = as_int(x) & EXSIGNBIT_SP32;
float s = -118 - clz(ax);
float r = (ax >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
r = ax >= PINFBITPATT_SP32 ? as_float(ax) : r;
r = ax < 0x00800000 ? s : r;
r = ax == 0 ? as_float(NINFBITPATT_SP32) : r;
return r;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, logb, float);
#ifdef cl_khr_fp64
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
_CLC_OVERLOAD _CLC_DEF double logb(double x) {
long ax = as_long(x) & EXSIGNBIT_DP64;
double s = -1011L - clz(ax);
double r = (int) (ax >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
r = ax >= PINFBITPATT_DP64 ? as_double(ax) : r;
r = ax < 0x0010000000000000L ? s : r;
r = ax == 0L ? as_double(NINFBITPATT_DP64) : r;
return r;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, logb, double)
#endif