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pytorch / cpuinfo

CPU INFOrmation library (x86/x86-64/ARM/ARM64, Linux/Windows/Android/macOS/iOS)
BSD 2-Clause "Simplified" License
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IOS A12 neon dot error #94

Closed chenqy4933 closed 2 years ago

chenqy4933 commented 2 years ago

I use cpuinfo in ios, and detect the arm neon dot instruction, and get the result:

ios-gtest: Begin to check cpu information, !!!!!!!!!!!!!!!!!!!!!!!!!!! ios-gtest: cpuinfo_get_package(0)->name: Apple A12 ios-gtest: cpu processor count is : 6 ios-gtest: cpu support neon: 1 ios-gtest: cpu support fp16: 1 ios-gtest: cpu support dot: 0

It seems the A12 processor is not support neon dot instruction? but A12 arch is above than armv8.2, I don't know the reason, maybe there is a bug?

Maratyszcza commented 2 years ago

NEON-DOT is optional in ARMv8.2, required in ARMv8.4. Apple SoCs before A13 doesn't support dot production instructions.

chenqy4933 commented 2 years ago

NEON-DOT is optional in ARMv8.2, required in ARMv8.4. Apple SoCs before A13 doesn't support dot production instructions.

yes，yes，the most android arm processor supported dot mislead me。

thanks！