Daniel Bertalan bcf124c07d LibC: Implement a faster memset routine for x86-64 in assembly ... This commit addresses the following shortcomings of our current, simple and elegant memset function: - REP STOSB/STOSQ has considerable startup overhead, it's impractical to use for smaller sizes. - Up until very recently, AMD CPUs didn't have support for "Enhanced REP MOVSB/STOSB", so it performed pretty poorly on them. With this commit applied, I could measure a ~5% decrease in `test-js`'s runtime when I used qemu's TCG backend. The implementation is based on the following article from Microsoft: https://msrc-blog.microsoft.com/2021/01/11/building-faster-amd64-memset-routines Two versions of the routine are implemented: one that uses the ERMS extension mentioned above, and one that performs plain SSE stores. The version appropriate for the CPU is selected at load time using an IFUNC.		2022-05-01 12:42:01 +02:00
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crti.S	LibC: Use our implementation of crti.o and crtn.o	2021-07-14 13:12:25 +02:00
crtn.S	LibC: Use our implementation of crti.o and crtn.o	2021-07-14 13:12:25 +02:00
memset.cpp	LibC: Implement a faster memset routine for x86-64 in assembly	2022-05-01 12:42:01 +02:00
memset.S	LibC: Implement a faster memset routine for x86-64 in assembly	2022-05-01 12:42:01 +02:00
setjmp.S	LibC: Fix sigsetjmp on x86_64	2021-08-26 00:54:23 +02:00