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- From: Felix Fietkau <nbd@nbd.name>
- Subject: [PATCH] mips: allow the compiler to optimize memset, memcmp, memcpy for better performance and (in some instances) smaller code
- lede-commit: 07e59c7bc7f375f792ec9734be42fe4fa391a8bb
- Signed-off-by: Felix Fietkau <nbd@nbd.name>
- ---
- arch/mips/boot/compressed/Makefile | 3 ++-
- arch/mips/include/asm/string.h | 38 ++++++++++++++++++++++++++++++++++++++
- arch/mips/lib/Makefile | 2 +-
- arch/mips/lib/memcmp.c | 22 ++++++++++++++++++++++
- 4 files changed, 63 insertions(+), 2 deletions(-)
- create mode 100644 arch/mips/lib/memcmp.c
- --- a/arch/mips/boot/compressed/Makefile
- +++ b/arch/mips/boot/compressed/Makefile
- @@ -23,7 +23,8 @@ KBUILD_CFLAGS := $(filter-out -pg, $(KBU
- KBUILD_CFLAGS := $(filter-out -fstack-protector, $(KBUILD_CFLAGS))
-
- KBUILD_CFLAGS := $(KBUILD_CFLAGS) -D__KERNEL__ \
- - -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull"
- + -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull" \
- + -D__ZBOOT__
-
- KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
- -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
- --- a/arch/mips/include/asm/string.h
- +++ b/arch/mips/include/asm/string.h
- @@ -140,4 +140,42 @@ extern void *memcpy(void *__to, __const_
- #define __HAVE_ARCH_MEMMOVE
- extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
-
- +#ifndef __ZBOOT__
- +#define memset(__s, __c, len) \
- +({ \
- + size_t __len = (len); \
- + void *__ret; \
- + if (__builtin_constant_p(len) && __len >= 64) \
- + __ret = memset((__s), (__c), __len); \
- + else \
- + __ret = __builtin_memset((__s), (__c), __len); \
- + __ret; \
- +})
- +
- +#define memcpy(dst, src, len) \
- +({ \
- + size_t __len = (len); \
- + void *__ret; \
- + if (__builtin_constant_p(len) && __len >= 64) \
- + __ret = memcpy((dst), (src), __len); \
- + else \
- + __ret = __builtin_memcpy((dst), (src), __len); \
- + __ret; \
- +})
- +
- +#define memmove(dst, src, len) \
- +({ \
- + size_t __len = (len); \
- + void *__ret; \
- + if (__builtin_constant_p(len) && __len >= 64) \
- + __ret = memmove((dst), (src), __len); \
- + else \
- + __ret = __builtin_memmove((dst), (src), __len); \
- + __ret; \
- +})
- +
- +#define __HAVE_ARCH_MEMCMP
- +#define memcmp(src1, src2, len) __builtin_memcmp((src1), (src2), (len))
- +#endif
- +
- #endif /* _ASM_STRING_H */
- --- a/arch/mips/lib/Makefile
- +++ b/arch/mips/lib/Makefile
- @@ -5,7 +5,7 @@
-
- lib-y += bitops.o csum_partial.o delay.o memcpy.o memset.o \
- mips-atomic.o strncpy_user.o \
- - strnlen_user.o uncached.o
- + strnlen_user.o uncached.o memcmp.o
-
- obj-y += iomap.o iomap_copy.o
- obj-$(CONFIG_PCI) += iomap-pci.o
- --- /dev/null
- +++ b/arch/mips/lib/memcmp.c
- @@ -0,0 +1,22 @@
- +/*
- + * copied from linux/lib/string.c
- + *
- + * Copyright (C) 1991, 1992 Linus Torvalds
- + */
- +
- +#include <linux/module.h>
- +#include <linux/string.h>
- +
- +#undef memcmp
- +int memcmp(const void *cs, const void *ct, size_t count)
- +{
- + const unsigned char *su1, *su2;
- + int res = 0;
- +
- + for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
- + if ((res = *su1 - *su2) != 0)
- + break;
- + return res;
- +}
- +EXPORT_SYMBOL(memcmp);
- +
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