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wangzhaode avatar wangzhaode commented on June 5, 2024

兼容更多编译器，有些低版本的gcc不支持这些汇编指令，会编译失败

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486946 avatar 486946 commented on June 5, 2024

兼容更多编译器，有些低版本的gcc不支持这些汇编指令，会编译失败
只是为了编译，但实际bfmmla需要支持armv8.6扩展，就算低版本编译器能编译过，但是不支持armv8.6扩展的硬件上还是跑不了吧？还是会报非法指令吧

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wangzhaode avatar wangzhaode commented on June 5, 2024

不会，运行时会根据CPU支持的指令集来选择计算kernel，不支持i8mm的CPU不会执行mmla代码；不支持sdot的CPU也不会执行sdot的代码；

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486946 avatar 486946 commented on June 5, 2024

不会，运行时会根据CPU支持的指令集来选择计算kernel，不支持i8mm的CPU不会执行mmla代码；不支持sdot的CPU也不会执行sdot的代码；
dot是有cpu判定；貌似bf启用没有这些cpu是否支持的判定？bf直接就是宏控制打开支持，且配置走bf16

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wangzhaode avatar wangzhaode commented on June 5, 2024

打开宏是必要条件不是充分条件；判断在这里：

MNN/source/backend/cpu/bf16/BF16Functions.cpp

Line 901 in d284430

if (gInstance->supportI8mm) {

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