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081c1687c8
Accessing the inactive member of a union is undefined behavior. Fortunately, we have c10::bit_cast. Differential Revision: [D65888680](https://our.internmc.facebook.com/intern/diff/D65888680/) Pull Request resolved: https://github.com/pytorch/pytorch/pull/140567 Approved by: https://github.com/Skylion007, https://github.com/malfet ghstack dependencies: #140564, #140565, #140566
34 lines
798 B
C++
34 lines
798 B
C++
#pragma once
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#include <c10/macros/Macros.h>
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#include <c10/util/bit_cast.h>
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#include <cstdint>
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namespace c10::detail {
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C10_HOST_DEVICE inline float fp32_from_bits(uint32_t w) {
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#if defined(__OPENCL_VERSION__)
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return as_float(w);
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#elif defined(__CUDA_ARCH__) || defined(__HIP_DEVICE_COMPILE__)
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return __uint_as_float((unsigned int)w);
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#elif defined(__INTEL_COMPILER)
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return _castu32_f32(w);
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#else
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return c10::bit_cast<float>(w);
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#endif
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}
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C10_HOST_DEVICE inline uint32_t fp32_to_bits(float f) {
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#if defined(__OPENCL_VERSION__)
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return as_uint(f);
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#elif defined(__CUDA_ARCH__) || defined(__HIP_DEVICE_COMPILE__)
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return (uint32_t)__float_as_uint(f);
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#elif defined(__INTEL_COMPILER)
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return _castf32_u32(f);
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#else
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return c10::bit_cast<uint32_t>(f);
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#endif
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}
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} // namespace c10::detail
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