Anton Altaparmakov wrote:
---LSB-- ---2SB-- ---3SB-- ---MSB-- [bytes] LITTLE_ENDIAN
L234567M L234567M L234567M L234567M [bits] LITTLE_ENDIAN_BITFIELD
No it is not. That makes no sense.
Why not? I honestly don't know what x86 does, but I would think that if I
write a 32-bit value to a memory location, that when I examine that memory
location, all 32 bits will be in order.
The whole point of little endian is
that you store LSB, then 2SB, then 3SB, then MSB and then when the CPU
You're talking about byte endian. I'm talking about bit endian -- the order
of bits within a byte. Software cannot know what the bit endian is, but
external devices that have memory-mapped registers can know.
reads this as a 32-bit word it rotates them all around so that in the
CPU register you have:
MSB_3SB_2SB_LSB
M765432L_M765432L_M765432L_M765432L
That is what little endian means and that is how shift operations can
work fine on the CPU.
The CPU shift operation, yes. I'm talking about shift operations on external
memory-mapped devices.
--
Timur Tabi
Linux Kernel Developer @ Freescale
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