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nuttx/libs/libc
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ganjing a0fcbb7957 libs/libc/risc-v: Refresh memcpy and memset with XLEN-adaptive loops. 
Rewrite arch_memcpy.S and arch_memset.S to be register-width aware on
both RV32 and RV64 using REG_L/REG_S/SZREG macros from asm.h.

memcpy gains:
 - 16xSZREG unrolled main loop (128B/iter on RV64, 64B on RV32).
 - Shift-merge path for misaligned src: reads two aligned words
   straddling each output word and shifts them together, so no load
   or store is ever misaligned.
 - Single SZREG and byte loops for remainder and small copies.

memset gains:
 - 32xSZREG unrolled main loop (256B/iter on RV64, 128B on RV32)
   using Duff's device for non-power-of-two remainders.
 - .option norvc ensures fixed 4-byte instruction width for correct
   jump offset calculation in the Duff's device entry.
 - Zero-length input handled correctly (branch to guarded tail).

The old memcpy always used lw/sw even on RV64, wasting half the
memory bandwidth. The old memset unrolled only 16 bytes per iteration.

Signed-off-by: ganjing <ganjing@xiaomi.com>
2026-08-12 10:24:01 +08:00
..
aio include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
assert lib_stackchk.c: a duplicate implementation error reported during compilation 2026-02-02 13:22:07 +08:00
audio include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
builtin libc/builtin: support per-application priority/stacksize under KERNEL build. 2026-07-13 15:23:39 -03:00
ctype style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
dirent libs/libc/dirent: preserve errno on readdir() end-of-directory 2026-06-02 23:34:25 +08:00
dlfcn libc/dlfcn: Count opens so a library can be shared. 2026-08-04 11:12:49 -03:00
elf cmake: Use NUTTX(_DIR/_BIN_DIR) instead CMAKE(_SRC_DIR/_BIN_DIR) 2026-08-09 11:13:08 -03:00
errno libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
eventfd libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
fdt cmake: Use NUTTX(_DIR/_BIN_DIR) instead CMAKE(_SRC_DIR/_BIN_DIR) 2026-08-09 11:13:08 -03:00
fixedmath !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
gdbstub arch/arm64: fix backtrace register access and gdbstub config guard 2026-01-16 08:55:47 -03:00
gnssutils cmake: Use NUTTX(_DIR/_BIN_DIR) instead CMAKE(_SRC_DIR/_BIN_DIR) 2026-08-09 11:13:08 -03:00
grp libc/grp: add getgrouplist() 2026-06-23 23:09:22 +08:00
hex2bin include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
inttypes !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
libgen libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
locale style/FAR: remove FAR qualifier 2025-11-10 10:56:29 +01:00
lzf !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
machine libs/libc/risc-v: Refresh memcpy and memset with XLEN-adaptive loops. 2026-08-12 10:24:01 +08:00
misc libc/crc32: add IEEE-compatible crc32_ieee for Linux/zlib interop 2026-07-03 10:18:28 +08:00
net include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
netdb libs/libc/netdb: Size an answer header by its header, not by its union. 2026-08-08 15:02:15 -03:00
obstack include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
pthread arch, sched/signal: Fix compilation with ENABLE_PARTIAL_SIGNALS=y 2026-06-16 17:07:32 +08:00
pwd libc/pwd: default ostest multiuser passwd path to /tmp/ostest_passwd 2026-07-30 09:48:10 +08:00
queue libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
regex libs/libc/regex: remove logically dead code in regcomp.c 2026-01-24 19:28:56 +08:00
sched include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
search libc/search: add foreach api for hcreate_data 2025-12-25 09:39:03 +08:00
semaphore sched/semaphore: Keep a negative task id out of the mutex holder. 2026-08-09 10:05:30 +08:00
signal sched/signal: Add support for disabling all signal functions 2026-01-18 08:24:13 -03:00
spawn spawn: allow zero stacksize/priority to use binary loader defaults 2026-07-15 12:24:44 -03:00
stdio !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
stdlib libs/libc: support explicit bases up to 36 2026-08-01 20:08:32 +08:00
stream libc/stream: Check lowout bounds before access 2026-07-06 09:02:22 +02:00
string !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
symtab libs/libc/symtab: fix bogus symbol size under SYMTAB_ORDEREDBYNAME 2026-08-05 21:51:25 +08:00
syslog drivers/syslog: Add RFC 5424 protocol support 2025-06-13 20:26:57 +08:00
termios drivers/serial: add job-control TTY ioctls and libc wrappers 2026-06-23 16:26:53 -03:00
time libc/time: Fix POSIX timezone string parsing. 2026-07-25 19:54:18 +08:00
tls libc/tls: update preprocessor condition comment to match implementation 2026-01-31 02:49:10 +08:00
uio move readv/writev to the kernel 2024-10-30 17:07:54 +08:00
unistd !sched/arch/libc: Give fork() and vfork() their real, separate semantics. 2026-08-10 08:57:30 -03:00
userfs include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
uuid libc: Refine the arc4random_buf implementation 2024-10-26 18:04:21 -03:00
wchar style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
wctype libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
wqueue !sched/clock: remove CONFIG_SYSTEM_TIME64 and always use 64-bit time 2026-05-19 16:21:28 +08:00
zoneinfo tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00
.gitignore libc/elf: rename modlib to libelf 2025-04-11 09:43:22 +08:00
CMakeLists.txt libs/libc: migrate to SPDX identifier 2024-10-01 12:25:52 +08:00
Kconfig libc/elf: rename modlib to libelf 2025-04-11 09:43:22 +08:00
libc.csv !sched/arch/libc: Give fork() and vfork() their real, separate semantics. 2026-08-10 08:57:30 -03:00
libc.h libs/libc/risc-v: Add optimized string and memory functions. 2026-08-12 10:23:47 +08:00
limits_check.c libs/libc: add limits checks 2026-07-02 09:02:21 -03:00
Makefile tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00