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ldq and stq on UltraSparc I and II
- From: "David O'Brien" <obrien at FreeBSD dot org>
- To: gcc at gcc dot gnu dot org
- Cc: davem at redhat dot com, rth at redhat dot com
- Date: Tue, 30 Apr 2002 14:11:12 -0700
- Subject: ldq and stq on UltraSparc I and II
- Organization: The NUXI BSD group
- Reply-to: obrien at FreeBSD dot org
Dave/Richard,
I found that GCC 3.1 uses ldq and stq to load long doubles w/HARD_QUAD.
The problem is UltraSparc I and II CPU's do not have the instructions in
silicon. FreeBSD has now emulated them, but of course there is a
performance hit. Should the sparc description be changed to not use
these CPU's? Or should -mcpu's possible values be expanded for greater
granularity on modern [UltraSparc] processors?
--
-- David (obrien@FreeBSD.org)