Standard glibc memcpy() vs. RISC-V Vector extension version on the Allwinner D1
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Re: Standard glibc memcpy() vs. RISC-V Vector extension version on the Allwinner D1
#2That's a pretty nice 3x speedup at 128 byte copy size.
Remarkable that the execution time is absolutely identical for anything from 0 to 128 bytes.
And the code is 1/24th the size.
Re: Standard glibc memcpy() vs. RISC-V Vector extension version on the Allwinner D1
#3I've now done the same thing for strcpy(). It's even more dramatic:
Re: Standard glibc memcpy() vs. RISC-V Vector extension version on the Allwinner D1
#4That's a pretty nice 3x speedup at 128 byte copy size. Remarkable that the execution time is absolutely identical for anything from 0 to 128 bytes. And the code is 1/24th the size.
I've reduced the time for lengths from 0 to 64 bytes from 46.8 ns to 30.9 ns without adversely affecting longer lengths. I also knocked 2 bytes off the code size, from 26 to 24 bytes.