diff options
Diffstat (limited to 'target/linux/generic/pending-4.14/306-mips_mem_functions_performance.patch')
| -rw-r--r-- | target/linux/generic/pending-4.14/306-mips_mem_functions_performance.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/306-mips_mem_functions_performance.patch b/target/linux/generic/pending-4.14/306-mips_mem_functions_performance.patch new file mode 100644 index 0000000000..e73cfd61b3 --- /dev/null +++ b/target/linux/generic/pending-4.14/306-mips_mem_functions_performance.patch @@ -0,0 +1,106 @@ +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); ++ |