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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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