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Revert "[BLAS] Avoid downcasts for fp16fp16->fp32 BLAS (#161999)"

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This reverts commit 02c83f1334.

Reverted https://github.com/pytorch/pytorch/pull/161999 on behalf of https://github.com/jeanschmidt due to break a few internal tests ([comment](https://github.com/pytorch/pytorch/pull/161999#issuecomment-3255381925))
This commit is contained in:
PyTorch MergeBot 2025-09-04 19:56:48 +00:00
parent afa6e5604d
commit c3d54dea9f
1 changed files with 5 additions and 5 deletions
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10
aten/src/ATen/native/CPUBlas.cpp
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@ -496,18 +496,18 @@ void gemm(
// for the fallback path, first compute gemm with beta = 0,
// and then add c in full precision.
int64_t c_size = n * m;
std::vector<float> float_c(c_size, 0.f);
gemm_no_downcast_stub(
std::vector<at::Half> float16_c(c_size, 0.f);
gemm_stub(
at::kCPU, at::kHalf,
transa, transb, m, n, k, alpha, a, lda, b, ldb, 0.f, float_c.data(), m);
transa, transb, m, n, k, alpha, a, lda, b, ldb, 0.f, float16_c.data(), m);
for (const auto j : c10::irange(n)) {
for (const auto i : c10::irange(m)) {
auto offset = j * ldc + i;
// beta == 0 won't propagate NaN from C
if (beta == 0.f) {
c[offset] = float_c[j * m + i];
c[offset] = c10::convert<float>(float16_c[j * m + i]);
} else {
c[offset] = beta * c[offset] + float_c[j * m + i];
c[offset] = beta * c[offset] + c10::convert<float>(float16_c[j * m + i]);
}
}
}