32-bit host vs 64-bit host

[Grant Edwards <grant dot b dot edwards at gmail dot com>]

Let's say I build two copies of the "same" toolchain: one on a 32-bit
(i686) host and the other on a 64-bit (amd64) host: both are using the
same configuration, same sources files, for the same target (e.g. ARM).

Would you expect the two toolchains to produce identical code when
given identical sources?

Or are there certain optimizations or transformations that differ
depend on the _host_ machine word-size or architecture?

For example: for the past few years you've been building an embedded
linux linux system for an ARM9 target using a 32-bit hosted toolchain.
How much of a risk is there if you move development to a 64-bit host
and rebuild your toolchains as 64-bit apps?

[Yes, I know that if you have 32-bit compatibility libraries you can
continue to use the existing 32-bit toolchain binaries.]

-- 
Grant Edwards               grant.b.edwards        Yow! Make me look like
                                  at               LINDA RONSTADT again!!
                              gmail.com            


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