[cl] Permit size 0 in clEnqueue(Read|Write|Copy|Fill)Buffer #387
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frasercrmck
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This is not explicitly forbidden by the current unified OpenCL specification for clEnqueueReadBuffer, clEnqueueWriteBuffer, or clEnqueueCopyBuffer; though it *was* forbidden up to and including OpenCL 2.0. Therefore, make the checks for size 0 dependent on the OpenCL version being built. A size of zero for clEnqueueFillBuffer has always been valid, so explicitly test that. The muxCommandFillBuffer function forbids a size of 0, so it was a bug to call that function when size was 0. This requires updating the mux specification to allow sizes of 0 in all of these functions. It also implicitly allows the same in the HAL, though this is not as tightly specified.
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hvdijk
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Mar 4, 2024
| inBuffer, 0, nullptr, nullptr)); | ||
| TEST_F(clEnqueueReadBufferTest, SizeZero) { | ||
| // An error when size == 0 was removed starting with OpenCL 2.1. | ||
| if (UCL::isDeviceVersionAtLeast({2, 1})) { |
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Do we test OpenCL <3.0 anywhere?
hvdijk
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Mar 4, 2024
| } | ||
| if (!mem_write(dst, temp.data(), size, locker)) { | ||
| return false; | ||
| if (size) { |
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I'm assuming this is because mem_read and mem_write still require size to be greater than zero? Are they used anywhere directly where a size of zero should be allowed?
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Hi @frasercrmck, do you think we should just close this one now? |
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Blast from the past. I've personally no drive to get this over the line - I can't even remember why it was required/desired? I'm happy if you want to close it. Presumably it can't be that important if you hadn't needed it in over a year. |
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This is not explicitly forbidden by the current unified OpenCL specification for
clEnqueueReadBuffer,clEnqueueWriteBuffer, orclEnqueueCopyBuffer; though it was forbidden up to and including OpenCL 2.0.Therefore, make the checks for size 0 dependent on the OpenCL version being built.
A size of zero for
clEnqueueFillBufferhas always been valid, so explicitly test that. ThemuxCommandFillBufferfunction forbids a size of 0, so it was a bug to call that function when size was 0.