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underflow detection

To: cgen at sources dot redhat dot com
Subject: underflow detection
From: Ben Elliston <bje at redhat dot com>
Date: Wed, 7 Mar 2001 09:58:28 +1100 (EST)

It looks like the `add-oflag' rtx detects the basic overflow
condition.  In this example:

	    (add-oflag x y z)

Is it sufficient to test if `x' (or `y') is negative to detect
underflow?

Ben

Follow-Ups:
- Re: underflow detection
  - From: Frank Ch. Eigler

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