Fixed double memory accesses of several pointwise operations.#5068
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soumith merged 1 commit intopytorch:masterfrom Feb 6, 2018
Merged
Fixed double memory accesses of several pointwise operations.#5068soumith merged 1 commit intopytorch:masterfrom
soumith merged 1 commit intopytorch:masterfrom
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Because nvcc does not know that in/out pointers do not alias each other, if we assign a value to *out and then use *in again, the kernel has to emit a write to *out and then another read from *in. (Affected kernels become marginally faster after the fix.)
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@pytorchbot retest this please |
soumith
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Feb 6, 2018
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Another possibility would be to use |
soumith
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Because nvcc does not know that in/out pointers do not alias each other, if we assign a value to *out and then use *in again, the kernel has to emit a write to *out and then another read from *in. (Affected kernels become marginally faster after the fix.)
laurentdupin
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Apr 24, 2026
…h#5068) Because nvcc does not know that in/out pointers do not alias each other, if we assign a value to *out and then use *in again, the kernel has to emit a write to *out and then another read from *in. (Affected kernels become marginally faster after the fix.)
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Because nvcc does not know that in/out pointers do not alias each other,
if we assign a value to *out and then use *in again, the kernel has to
emit a write to *out and then another read from *in.
(Affected kernels become marginally faster after the fix.)