Ma Ling
3b4b682bec
x86, mem: Optimize memmove for small size and unaligned cases
...
movs instruction will combine data to accelerate moving data,
however we need to concern two cases about it.
1. movs instruction need long lantency to startup,
so here we use general mov instruction to copy data.
2. movs instruction is not good for unaligned case,
even if src offset is 0x10, dest offset is 0x0,
we avoid and handle the case by general mov instruction.
Signed-off-by: Ma Ling <ling.ma@intel.com >
LKML-Reference: <1284664360-6138-1-git-send-email-ling.ma@intel.com >
Signed-off-by: H. Peter Anvin <hpa@zytor.com >
2010-09-24 18:57:11 -07:00
Ma, Ling
fdf4289679
x86, mem: Don't implement forward memmove() as memcpy()
...
memmove() allow source and destination address to be overlap, but
there is no such limitation for memcpy(). Therefore, explicitly
implement memmove() in both the forwards and backward directions, to
give us the ability to optimize memcpy().
Signed-off-by: Ma Ling <ling.ma@intel.com >
LKML-Reference: <C10D3FB0CD45994C8A51FEC1227CE22F0E483AD86A@shsmsx502.ccr.corp.intel.com >
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com >
2010-08-23 14:14:27 -07:00
Paolo Ciarrocchi
e940659788
x86: coding style fixes to arch/x86/lib/memmove_64.c
...
After the patch:
total: 0 errors, 0 warnings, 21 lines checked
no code changed:
arch/x86/lib/memmove_64.o:
text data bss dec hex filename
116 0 0 116 74 memmove_64.o.before
116 0 0 116 74 memmove_64.o.after
md5:
2d6b0951cafb86a11a222cdd70f6104f memmove_64.o.before.asm
2d6b0951cafb86a11a222cdd70f6104f memmove_64.o.after.asm
Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
2008-04-17 17:40:48 +02:00
Jan Engelhardt
ade1af7712
x86: remove unneded casts
...
x86: remove unneeded casts
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
Signed-off-by: Thomas Gleixner <tglx@linutronix.de >
2008-01-30 13:33:23 +01:00
Thomas Gleixner
185f3d3890
x86_64: move lib
...
Signed-off-by: Thomas Gleixner <tglx@linutronix.de >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
2007-10-11 11:17:08 +02:00
