提交 694fc88c 编写于 作者: N Naveen N. Rao 提交者: Michael Ellerman

powerpc/string: Implement optimized memset variants

Based on Matthew Wilcox's patches for other architectures.
Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
上级 00e7c259
......@@ -23,6 +23,30 @@ extern void * memmove(void *,const void *,__kernel_size_t);
extern int memcmp(const void *,const void *,__kernel_size_t);
extern void * memchr(const void *,int,__kernel_size_t);
#ifdef CONFIG_PPC64
#define __HAVE_ARCH_MEMSET16
#define __HAVE_ARCH_MEMSET32
#define __HAVE_ARCH_MEMSET64
extern void *__memset16(uint16_t *, uint16_t v, __kernel_size_t);
extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
extern void *__memset64(uint64_t *, uint64_t v, __kernel_size_t);
static inline void *memset16(uint16_t *p, uint16_t v, __kernel_size_t n)
{
return __memset16(p, v, n * 2);
}
static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
{
return __memset32(p, v, n * 4);
}
static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
{
return __memset64(p, v, n * 8);
}
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_STRING_H */
......@@ -13,6 +13,23 @@
#include <asm/ppc_asm.h>
#include <asm/export.h>
_GLOBAL(__memset16)
rlwimi r4,r4,16,0,15
/* fall through */
_GLOBAL(__memset32)
rldimi r4,r4,32,0
/* fall through */
_GLOBAL(__memset64)
neg r0,r3
andi. r0,r0,7
cmplw cr1,r5,r0
b .Lms
EXPORT_SYMBOL(__memset16)
EXPORT_SYMBOL(__memset32)
EXPORT_SYMBOL(__memset64)
_GLOBAL(memset)
neg r0,r3
rlwimi r4,r4,8,16,23
......@@ -20,7 +37,7 @@ _GLOBAL(memset)
rlwimi r4,r4,16,0,15
cmplw cr1,r5,r0 /* do we get that far? */
rldimi r4,r4,32,0
PPC_MTOCRF(1,r0)
.Lms: PPC_MTOCRF(1,r0)
mr r6,r3
blt cr1,8f
beq+ 3f /* if already 8-byte aligned */
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册