Here’s an updated patch, providing support for underflow control in the 
IEEE_ARITHMETIC module, for x86/x86_64 targets and alpha-glibc.

Bootstrapped and regtested on x86_64-apple-darwin13, tested by Uros on alpha.

OK to commit?

Attachment: underflow.ChangeLog
Description: Binary data

Attachment: underflow.diff
Description: Binary data

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