[m-rev.] for review: cheaper tag test for high-level C

[Zoltan Somogyi]

On 09-May-2011, Peter Wang <novalazy at gmail.com> wrote:
> Surprisingly, this change actually produces a slowdown in the compiler,
> so I'm not sure whether it should be applied.  Here is the speed test
> on my machine (hlc.gc -O2)
> 
> mercury_compile.new average of 6 with ignore=1      9.50
> mercury_compile.old average of 6 with ignore=1      9.46

That is not evidence of a slowdown. That is evidence of "too close to call".

Zoltan.
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