How useful is the web pass on targets other than x86/amd64?

[Steven Bosscher]

Hi,

Following some discussions about IV splitting and the webizer pass, I
have done a bunch of SPEC tests on x86 and amd64 to compare the scores
with the webizer pass enabled and disabled.

I have tested "-O[23] {,-fnoweb} {,-funroll-all-loops} {,-m32}", for
SPECint and SPECfp on an amd64 box.  For some individual benchmarks
the scores regressed, but some others they improved.  Overall I could
not find one set of options where the webizer makes a difference on
the mean score.

So perhaps we should disable (and perhaps remove??) the webizer pass,
but this of course also depends on how it affects code generation for
other targets.

Does anyone know if web helps on other targets (ppc, ia64, etc.)?

Gr.
Steven