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Escape subnormal values #1953

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May 30, 2024
Merged

Escape subnormal values #1953

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10 changes: 7 additions & 3 deletions test_common/harness/imageHelpers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1125,13 +1125,15 @@ cl_ulong get_image_size_mb(image_descriptor const *imageInfo)
uint64_t gRoundingStartValue = 0;


void escape_inf_nan_values(char *data, size_t allocSize)
void escape_inf_nan_subnormal_values(char *data, size_t allocSize)
{
// filter values with 8 not-quite-highest bits
unsigned int *intPtr = (unsigned int *)data;
for (size_t i = 0; i<allocSize>> 2; i++)
{
if ((intPtr[i] & 0x7F800000) == 0x7F800000) intPtr[i] ^= 0x40000000;
else if ((intPtr[i] & 0x7F800000) == 0)
intPtr[i] ^= 0x40000000;
}

// Ditto with half floats (16-bit numbers with the 5 not-quite-highest bits
Expand All @@ -1140,6 +1142,8 @@ void escape_inf_nan_values(char *data, size_t allocSize)
for (size_t i = 0; i<allocSize>> 1; i++)
{
if ((shortPtr[i] & 0x7C00) == 0x7C00) shortPtr[i] ^= 0x4000;
else if ((shortPtr[i] & 0x7C00) == 0)
shortPtr[i] ^= 0x4000;
}
}

Expand Down Expand Up @@ -1218,7 +1222,7 @@ char *generate_random_image_data(image_descriptor *imageInfo,

// Note: inf or nan float values would cause problems, although we don't
// know this will actually be a float, so we just know what to look for
escape_inf_nan_values(data, allocSize);
escape_inf_nan_subnormal_values(data, allocSize);
return data;
}

Expand All @@ -1230,7 +1234,7 @@ char *generate_random_image_data(image_descriptor *imageInfo,

// Note: inf or nan float values would cause problems, although we don't
// know this will actually be a float, so we just know what to look for
escape_inf_nan_values(data, allocSize);
escape_inf_nan_subnormal_values(data, allocSize);

if (/*!gTestMipmaps*/ imageInfo->num_mip_levels < 2)
{
Expand Down
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