From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alessandro Rubini <ar@gnudd.com>
Date: Mon, 19 May 2008 23:04:09 +0200
Subject: [U-Boot-Users] [PATCH] mips: tolerate the MIPS 'CFG_HZ' values
	in the MHZ range for NAND delays
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> If possible, we *want* the preprocessor to remove any code that does
> not apply for a specific configuration. Generating code just bloats
> the memory footprint.

Definitely. 

But constant expressions are evaluated at compile time. So the dead
branch (if or else) doesn't generate any object code. There is no
memory footprint overhead.

When possible, I prefer to use C conditionals rather than preprocessor
conditionals. I raised the point because I see u-boot wants to get rid
of preprocessor mess when it brings no cost.

/alessandro