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Re: Architecture floating-point underflow information wanted
- From: Andreas Schwab <schwab at linux-m68k dot org>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>
- Cc: <libc-alpha at sourceware dot org>, <libc-ports at sourceware dot org>, Andreas Krebbel <krebbel at linux dot vnet dot ibm dot com>, Richard Henderson <rth at twiddle dot net>, Mark Salter <msalter at redhat dot com>, Carlos O'Donell <carlos at systemhalted dot org>, Mike Frysinger <vapier at gentoo dot org>
- Date: Tue, 25 Sep 2012 15:11:55 +0200
- Subject: Re: Architecture floating-point underflow information wanted
- References: <Pine.LNX.4.64.1209251238230.12872@digraph.polyomino.org.uk>
"Joseph S. Myers" <joseph@codesourcery.com> writes:
> m68k (classic)
According to the manual: before rounding.
M68000PRM, section 3.6.1 (p. 3-28): "At the completion of an arithmetic
operation, the intermediate result is checked to see if it is too small
to be represented as a normalized number in the selected precision. If
so, the underflow (UNFL) bit is set in the FPSR EXC byte."
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
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