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Merged
xiaoxiang781216 merged 3 commits into from
Aug 12, 2026
Merged

libs/libc/risc-v: Add optimized string and memory functions. #19782

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50539fb
libs/libc/risc-v: Add optimized string and memory functions.
Shanks0224 Aug 11, 2026
a0ef962
libs/libc/risc-v: Unroll memcmp with 4-word XOR|OR folding.
Shanks0224 Aug 11, 2026
b66728b
libs/libc/risc-v: Add optimized strlcpy.
Shanks0224 Aug 11, 2026
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10 changes: 10 additions & 0 deletions libs/libc/libc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,16 @@
# define LIBC_BUILD_STRRCHR
#endif

#if ((!defined(CONFIG_LIBC_PREVENT_STPCPY_USER) && !defined(__KERNEL__)) || \
(!defined(CONFIG_LIBC_PREVENT_STPCPY_KERNEL) && defined(__KERNEL__)))
# define LIBC_BUILD_STPCPY
#endif

#if ((!defined(CONFIG_LIBC_PREVENT_STPNCPY_USER) && !defined(__KERNEL__)) || \
(!defined(CONFIG_LIBC_PREVENT_STPNCPY_KERNEL) && defined(__KERNEL__)))
# define LIBC_BUILD_STPNCPY
#endif

#ifdef CONFIG_MM_KASAN
# define ARCH_LIBCFUN(x) arch_##x
#else
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60 changes: 60 additions & 0 deletions libs/libc/machine/risc-v/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,70 @@ if(CONFIG_RISCV_MEMSET)
list(APPEND SRCS arch_memset.S)
endif()

if(CONFIG_RISCV_MEMMOVE)
list(APPEND SRCS arch_memmove.S)
endif()

if(CONFIG_RISCV_MEMCMP)
list(APPEND SRCS arch_memcmp.S)
endif()

if(CONFIG_RISCV_MEMCHR)
list(APPEND SRCS arch_memchr.S)
endif()

if(CONFIG_RISCV_STRCMP)
list(APPEND SRCS arch_strcmp.S)
endif()

if(CONFIG_RISCV_STRLEN)
list(APPEND SRCS arch_strlen.S)
endif()

if(CONFIG_RISCV_STRNLEN)
list(APPEND SRCS arch_strnlen.S)
endif()

if(CONFIG_RISCV_STRCPY)
list(APPEND SRCS arch_strcpy.S)
endif()

if(CONFIG_RISCV_STRNCPY)
list(APPEND SRCS arch_strncpy.S)
endif()

if(CONFIG_RISCV_STPCPY)
list(APPEND SRCS arch_stpcpy.S)
endif()

if(CONFIG_RISCV_STPNCPY)
list(APPEND SRCS arch_stpncpy.S)
endif()

if(CONFIG_RISCV_STRCHR)
list(APPEND SRCS arch_strchr.S)
endif()

if(CONFIG_RISCV_STRCHRNUL)
list(APPEND SRCS arch_strchrnul.S)
endif()

if(CONFIG_RISCV_STRRCHR)
list(APPEND SRCS arch_strrchr.S)
endif()

if(CONFIG_RISCV_STRNCMP)
list(APPEND SRCS arch_strncmp.S)
endif()

if(CONFIG_RISCV_STRLCPY)
list(APPEND SRCS arch_strlcpy.S)
endif()

if(CONFIG_RISCV_STRCAT)
list(APPEND SRCS arch_strcat.S)
endif()

if(CONFIG_ARCH_SETJMP_H)
list(APPEND SRCS arch_setjmp.S)
endif()
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134 changes: 134 additions & 0 deletions libs/libc/machine/risc-v/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,22 @@ config RISCV_STRING_FUNCTION
depends on ARCH_TOOLCHAIN_GNU
select RISCV_MEMCPY
select RISCV_MEMSET
select RISCV_MEMMOVE
select RISCV_MEMCMP
select RISCV_MEMCHR
select RISCV_STRCMP
select RISCV_STRLEN
select RISCV_STRNLEN
select RISCV_STRCPY
select RISCV_STRNCPY
select RISCV_STPCPY
select RISCV_STPNCPY
select RISCV_STRCHR
select RISCV_STRCHRNUL
select RISCV_STRRCHR
select RISCV_STRNCMP
select RISCV_STRCAT
select RISCV_STRLCPY

config RISCV_MEMCPY
bool "Enable optimized memcpy() for RISC-V"
Expand All @@ -26,6 +41,30 @@ config RISCV_MEMSET
---help---
Enable optimized RISC-V specific memset() library function

config RISCV_MEMMOVE
bool "Enable optimized memmove() for RISC-V"
default n
select LIBC_ARCH_MEMMOVE
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific memmove() library function

config RISCV_MEMCMP
bool "Enable optimized memcmp() for RISC-V"
default n
select LIBC_ARCH_MEMCMP
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific memcmp() library function

config RISCV_MEMCHR
bool "Enable optimized memchr() for RISC-V"
default n
select LIBC_ARCH_MEMCHR
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific memchr() library function

config RISCV_STRCMP
bool "Enable optimized strcmp() for RISC-V"
default n
Expand All @@ -34,3 +73,98 @@ config RISCV_STRCMP
---help---
Enable optimized RISC-V specific strcmp() library function

config RISCV_STRLEN
bool "Enable optimized strlen() for RISC-V"
default n
select LIBC_ARCH_STRLEN
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strlen() library function

config RISCV_STRNLEN
bool "Enable optimized strnlen() for RISC-V"
default n
select LIBC_ARCH_STRNLEN
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strnlen() library function

config RISCV_STRCPY
bool "Enable optimized strcpy() for RISC-V"
default n
select LIBC_ARCH_STRCPY
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strcpy() library function

config RISCV_STRNCPY
bool "Enable optimized strncpy() for RISC-V"
default n
select LIBC_ARCH_STRNCPY
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strncpy() library function

config RISCV_STPCPY
bool "Enable optimized stpcpy() for RISC-V"
default n
select LIBC_ARCH_STPCPY
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific stpcpy() library function

config RISCV_STPNCPY
bool "Enable optimized stpncpy() for RISC-V"
default n
select LIBC_ARCH_STPNCPY
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific stpncpy() library function

config RISCV_STRCHR
bool "Enable optimized strchr() for RISC-V"
default n
select LIBC_ARCH_STRCHR
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strchr() library function

config RISCV_STRCHRNUL
bool "Enable optimized strchrnul() for RISC-V"
default n
select LIBC_ARCH_STRCHRNUL
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strchrnul() library function

config RISCV_STRRCHR
bool "Enable optimized strrchr() for RISC-V"
default n
select LIBC_ARCH_STRRCHR
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strrchr() library function

config RISCV_STRNCMP
bool "Enable optimized strncmp() for RISC-V"
default n
select LIBC_ARCH_STRNCMP
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strncmp() library function

config RISCV_STRCAT
bool "Enable optimized strcat() for RISC-V"
default n
select LIBC_ARCH_STRCAT
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strcat() library function

config RISCV_STRLCPY
bool "Enable optimized strlcpy() for RISC-V"
default n
select LIBC_ARCH_STRLCPY
depends on ARCH_TOOLCHAIN_GNU
---help---
Enable optimized RISC-V specific strlcpy() library function
60 changes: 60 additions & 0 deletions libs/libc/machine/risc-v/Make.defs
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,70 @@ ifeq ($(CONFIG_RISCV_MEMSET),y)
ASRCS += arch_memset.S
endif

ifeq ($(CONFIG_RISCV_MEMMOVE),y)
ASRCS += arch_memmove.S
endif

ifeq ($(CONFIG_RISCV_MEMCMP),y)
ASRCS += arch_memcmp.S
endif

ifeq ($(CONFIG_RISCV_MEMCHR),y)
ASRCS += arch_memchr.S
endif

ifeq ($(CONFIG_RISCV_STRCMP),y)
ASRCS += arch_strcmp.S
endif

ifeq ($(CONFIG_RISCV_STRLEN),y)
ASRCS += arch_strlen.S
endif

ifeq ($(CONFIG_RISCV_STRNLEN),y)
ASRCS += arch_strnlen.S
endif

ifeq ($(CONFIG_RISCV_STRCPY),y)
ASRCS += arch_strcpy.S
endif

ifeq ($(CONFIG_RISCV_STRNCPY),y)
ASRCS += arch_strncpy.S
endif

ifeq ($(CONFIG_RISCV_STPCPY),y)
ASRCS += arch_stpcpy.S
endif

ifeq ($(CONFIG_RISCV_STPNCPY),y)
ASRCS += arch_stpncpy.S
endif

ifeq ($(CONFIG_RISCV_STRCHR),y)
ASRCS += arch_strchr.S
endif

ifeq ($(CONFIG_RISCV_STRCHRNUL),y)
ASRCS += arch_strchrnul.S
endif

ifeq ($(CONFIG_RISCV_STRRCHR),y)
ASRCS += arch_strrchr.S
endif

ifeq ($(CONFIG_RISCV_STRNCMP),y)
ASRCS += arch_strncmp.S
endif

ifeq ($(CONFIG_RISCV_STRLCPY),y)
ASRCS += arch_strlcpy.S
endif

ifeq ($(CONFIG_RISCV_STRCAT),y)
ASRCS += arch_strcat.S
endif

ifeq ($(CONFIG_ARCH_SETJMP_H),y)
ASRCS += arch_setjmp.S
endif
Expand Down
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