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Coerce to true_ctype in tensor_factory #7856

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Merged
merged 2 commits into from
Jan 23, 2025
Merged

Coerce to true_ctype in tensor_factory #7856

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0d910f0
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swolchok Jan 22, 2025
0d365a6
Support Half/BFloat16 in prod operator (#7857)
swolchok Jan 23, 2025
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26 changes: 23 additions & 3 deletions runtime/core/exec_aten/testing_util/tensor_factory.h
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Original file line number Diff line number Diff line change
Expand Up @@ -279,7 +279,10 @@ class TensorFactory {
t = empty_strided(sizes, strides);
}
if (t.nbytes() > 0) {
memcpy(t.template data<true_ctype>(), data.data(), t.nbytes());
std::transform(
data.begin(), data.end(), t.template data<true_ctype>(), [](auto x) {
return static_cast<true_ctype>(x);
});
}
return t;
}
Expand Down Expand Up @@ -319,7 +322,10 @@ class TensorFactory {
t = empty_strided(sizes, strides);
}
if (t.nbytes() > 0) {
memcpy(t.template data<true_ctype>(), data.data(), t.nbytes());
std::transform(
data.begin(), data.end(), t.template data<true_ctype>(), [](auto x) {
return static_cast<true_ctype>(x);
});
}
return t;
}
Expand Down Expand Up @@ -721,6 +727,13 @@ class TensorFactory {
*/
using ctype = typename internal::ScalarTypeToCppTypeWrapper<DTYPE>::ctype;

/**
* The official C type for the scalar type. Used when accessing elements
* of a constructed Tensor.
*/
using true_ctype =
typename executorch::runtime::ScalarTypeToCppType<DTYPE>::type;

TensorFactory() = default;

/**
Expand Down Expand Up @@ -1019,7 +1032,14 @@ class TensorFactory {
data_.data(),
dim_order_.data(),
strides_.data(),
dynamism) {}
dynamism) {
// The only valid values for bool are 0 and 1; coerce!
if constexpr (std::is_same_v<true_ctype, bool>) {
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@kimishpatel kimishpatel Jan 23, 2025

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It seems in ifdef aten section this transformation is unconditional while here it is applied only if it is bool. I dont fully understand.

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@swolchok swolchok Jan 23, 2025

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it doesn't build with bits16 and we don't have bit_cast, otherwise I would make it unconditional here and use bit_cast.

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@kimishpatel kimishpatel Jan 23, 2025

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I am guessing bit_cast not being usable is related to it available only in c++20.

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@swolchok swolchok Jan 23, 2025

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yes; we will have access to c10::bit_cast once I get back to code sharing but currently we don't have it.

for (auto& x : data_) {
x = static_cast<true_ctype>(x);
}
}
}

std::vector<int32_t> sizes_;
std::vector<ctype> data_;
Expand Down
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