What is your model for the way that the RTL and C statements in the
new signbittf2 pattern interact?

The C preparation statements are executed before the RTL code
generated from the RTL template.  In the patch, it seems that the new
pattern is assuming that it can rely on some results produced by the
RTL template.  Maybe this seems to work because data dependence
reorders the statements when compiled with optimization.

Thanks, David

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