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Use float<->half conversion routines from the OpenCL headers (#884)

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* Use float<->half conversion routines from the OpenCL headers

Fixes #870

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

* Use cl_half_from_double

* Fix windows build errors

* Fix more build errors

* Code formatting

* Remove TEST class
This commit is contained in:
Kévin Petit
2020-08-14 13:50:14 +01:00
committed by GitHub
parent 655d83db80
commit ed50fcad2d
15 changed files with 64 additions and 941 deletions
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45
test_common/harness/errorHelpers.cpp
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@@ -22,6 +22,8 @@
#include "parseParameters.h"
#include <CL/cl_half.h>
const char *IGetErrorString( int clErrorCode )
{
switch( clErrorCode )
@@ -287,7 +289,6 @@ const char *GetDataVectorString( void *dataBuffer, size_t typeSize, size_t vecSi
#endif
static float Ulp_Error_Half_Float( float test, double reference );
static inline float half2float( cl_ushort half );
// taken from math tests
#define HALF_MIN_EXP -13
@@ -334,49 +335,9 @@ static float Ulp_Error_Half_Float( float test, double reference )
return (float) scalbn( testVal - reference, ulp_exp );
}
// Taken from vLoadHalf test
static inline float half2float( cl_ushort us )
{
uint32_t u = us;
uint32_t sign = (u << 16) & 0x80000000;
int32_t exponent = (u & 0x7c00) >> 10;
uint32_t mantissa = (u & 0x03ff) << 13;
union{ unsigned int u; float f;}uu;
if( exponent == 0 )
{
if( mantissa == 0 )
return sign ? -0.0f : 0.0f;
int shift = __builtin_clz( mantissa ) - 8;
exponent -= shift-1;
mantissa <<= shift;
mantissa &= 0x007fffff;
}
else
if( exponent == 31)
{
uu.u = mantissa | sign;
if( mantissa )
uu.u |= 0x7fc00000;
else
uu.u |= 0x7f800000;
return uu.f;
}
exponent += 127 - 15;
exponent <<= 23;
exponent |= mantissa;
uu.u = exponent | sign;
return uu.f;
}
float Ulp_Error_Half( cl_ushort test, float reference )
{
return Ulp_Error_Half_Float( half2float(test), reference );
return Ulp_Error_Half_Float(cl_half_to_float(test), reference);
}