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bcf124c07d3f4ec753e7e09007dda27a2e4e9c27
ladybird/Userland/Libraries/LibC
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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
..
arch
LibC: Implement a faster memset routine for x86-64 in assembly
2022-05-01 12:42:01 +02:00
arpa
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bits
LibC: Implement __fseterr
2022-04-03 19:15:14 +02:00
net
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netinet
LibC: Add TCP_MAXSEG to tcp.h
2022-03-02 11:40:37 +01:00
sys
LibC: Add MIN, MAX and howmany macros to sys/param.h
2022-04-29 22:01:27 +02:00
alloca.h
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assert.cpp
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assert.h
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byteswap.h
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CMakeLists.txt
LibC: Implement a faster memset routine for x86-64 in assembly
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crt0_shared.cpp
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crt0.cpp
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ctype.cpp
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ctype.h
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cxxabi.cpp
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dirent.cpp
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dirent.h
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dlfcn.cpp
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elf.h
LibELF: Add support for IFUNCs
2022-05-01 12:42:01 +02:00
endian.h
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errno_codes.h
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errno.h
LibC: Implement errno via a __errno_location() function
2022-04-21 11:49:48 +02:00
fcntl.cpp
LibC: Implement posix_fadvise() (as a harmless no-op)
2022-04-29 22:01:30 +02:00
fcntl.h
LibC: Add all the POSIX_FADV_* constants
2022-04-30 16:22:40 +02:00
fd_set.h
LibC: Remove semicolon in definition of FD_ZERO
2022-03-06 13:00:42 +01:00
fenv.cpp
LibC: Actually set the FPU environment instead of its pointer
2022-04-29 22:01:06 +02:00
fenv.h
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float.h
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fnmatch.cpp
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fnmatch.h
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getopt.cpp
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getopt.h
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grp.cpp
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grp.h
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iconv.h
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ifaddrs.cpp
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ifaddrs.h
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inttypes.cpp
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inttypes.h
LibC: Use correct inttypes.h format strings on Aarch64
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ioctl.cpp
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langinfo.cpp
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langinfo.h
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libcinit.cpp
LibC: Implement errno via a __errno_location() function
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libgen.cpp
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libgen.h
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limits.h
LibC: Unconditionally include bits/posix1_lim.h from limits.h
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link.cpp
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link.h
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locale.cpp
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locale.h
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malloc.cpp
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mallocdefs.h
LibC: Increase alignment for malloc() BigAllocationBlocks to 16 bytes
2022-03-02 11:40:37 +01:00
memory.h
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mntent.cpp
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mntent.h
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net.cpp
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netdb.cpp
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netdb.h
LibC: Make nameinfo (NI_*) constants bitfield-friendly
2022-04-21 11:50:38 +02:00
nl_types.h
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paths.h
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poll.cpp
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poll.h
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priority.cpp
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pthread_forward.cpp
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pthread_integration.cpp
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pthread_tls.cpp
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pty.cpp
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pty.h
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pwd.cpp
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pwd.h
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qsort.cpp
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regex.cpp
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regex.h
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resolv.cpp
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resolv.h
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scanf.cpp
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sched.cpp
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sched.h
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search.cpp
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search.h
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serenity.cpp
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serenity.h
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setjmp.h
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shadow.cpp
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shadow.h
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signal_numbers.h
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signal.cpp
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signal.h
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spawn.cpp
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spawn.h
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ssp.cpp
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stat.cpp
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stdarg.h
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stddef.h
LibC: Define offsetof in stddef.h instead of sys/cdefs.h
2022-02-28 20:28:01 -08:00
stdint.h
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stdio_ext.h
LibC: Implement __fseterr
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stdio.cpp
LibC: Implement __fseterr
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stdio.h
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stdlib.cpp
LibC: Stub out posix_memalign()
2022-04-21 11:50:38 +02:00
stdlib.h
LibC: Stub out posix_memalign()
2022-04-21 11:50:38 +02:00
string.cpp
LibC: Implement a faster memset routine for x86-64 in assembly
2022-05-01 12:42:01 +02:00
string.h
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strings.cpp
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strings.h
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stubs.cpp
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sysexits.h
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syslog.cpp
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syslog.h
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termcap.cpp
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termcap.h
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termios.cpp
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termios.h
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time.cpp
LibC: Return early in time_to_tm for large time_t
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time.h
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times.cpp
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ulimit.cpp
LibC: Add a wrapper for the getrusage syscall
2022-02-28 20:09:37 +01:00
ulimit.h
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unistd.cpp
Kernel+LibC+LibCore: Implement the unlinkat(2) syscall
2022-04-23 10:43:32 -07:00
unistd.h
LibC: Add more _POSIX_FOO constants to unistd.h
2022-04-29 22:01:27 +02:00
utime.cpp
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utime.h
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utmp.h
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utsname.cpp
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wchar.cpp
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wchar.h
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wctype.cpp
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wctype.h
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wstdio.cpp
LibC: Automatically append null terminator in vswprintf
2022-03-20 08:40:36 -04:00