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armclang and memcpy: Weird behavior

42Bastian Schick

Just for info:

armclang optimizes memcpy() in a weird way (seen for ARMv7e-M), not respecting the order of access.

So a memcpy(RBAR, mputable,...) failes :(

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  • 0 in reply to Ronan Synnott

    Roman, the problem is not the MPU programming. But the strange order of memory accesses of the memcpy. Any device which wants a linear order of accesses would fail. I am using memcpy on a lot of different platforms with a multitude of compilers, and never saw a behavior like this. But maybe the C standard allows it, I do not know.

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  • 0 in reply to Ronan Synnott

    Roman, the problem is not the MPU programming. But the strange order of memory accesses of the memcpy. Any device which wants a linear order of accesses would fail. I am using memcpy on a lot of different platforms with a multitude of compilers, and never saw a behavior like this. But maybe the C standard allows it, I do not know.

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