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