[lwip-devel] [bug #27352] Change ip_addr from struct to typedef (u32_t)

[Bill Auerbach]

Follow-up Comment #33, bug #27352 (project lwip):

Another reason for these macros, and htonl and ntohl versions as macros is
that both can be useful with constant data.  In the NIOS, we used ntohl and
htonl operations as custom opcodes.  It was still nicer to use macro versions
in some cases because the compiler can get the 32-bit value for free.

By the way, if I understood right, Simon mentioned macros with constants
"should be improved by the compiler".  I have yet to see a compiler, even with
no optimizer at all, that doesn't do constant folding.  This makes IP4_ADDR
always evaluate to a single constant with no runtime code.

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