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Utility helper to deduce scalar type from NSNumber. #9552

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Merged
shoumikhin merged 1 commit into from
Mar 25, 2025
Merged

Utility helper to deduce scalar type from NSNumber. #9552

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37 changes: 37 additions & 0 deletions extension/apple/ExecuTorch/Internal/ExecuTorchUtils.h
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Original file line number Diff line number Diff line change
Expand Up @@ -7,3 +7,40 @@
*/

#import <Foundation/Foundation.h>

#ifdef __cplusplus

#import <executorch/runtime/core/exec_aten/exec_aten.h>

namespace executorch::extension::utils {
using namespace aten;

/**
* Deduces the scalar type for a given NSNumber based on its type encoding.
*
* @param number The NSNumber instance whose scalar type is to be deduced.
* @return The corresponding ScalarType.
*/
static inline ScalarType deduceScalarType(NSNumber *number) {
auto type = [number objCType][0];
type = (type >= 'A' && type <= 'Z') ? type + ('a' - 'A') : type;
if (type == 'c') {
return ScalarType::Byte;
} else if (type == 's') {
return ScalarType::Short;
} else if (type == 'i') {
return ScalarType::Int;
} else if (type == 'q' || type == 'l') {
return ScalarType::Long;
} else if (type == 'f') {
return ScalarType::Float;
} else if (type == 'd') {
return ScalarType::Double;
}
ET_CHECK_MSG(false, "Unsupported type: %c", type);
return ScalarType::Undefined;
}

} // namespace executorch::extension::utils

#endif // __cplusplus
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