On 9/30/25 9:30 AM, Greg A. Woods wrote:
At Sat, 27 Sep 2025 10:36:59 +0200, Joerg Sonnenberger <[email protected]> wrote:
Subject: Re: floating point woes on i386
On 9/26/25 5:50 PM, RVP wrote:
On Thu, 25 Sep 2025, Greg Troxel wrote:
I ran paranoia (pkgsrc/benchmarks/paranoia) on 9 and 10. On 9:
The number of FAILUREs encountered = 3.
The number of SERIOUS DEFECTs discovered = 4.
The number of DEFECTs discovered = 3.
The number of FLAWs discovered = 2.
which is shocking, especially as I remember earlier NetBSD i386 versions
being ok, like 5 or 7.
Force strict standards compliance with
`-std=c89' or `-std=c99', or pass the
`-fexcess-precision=standard' flag to the compiler.
There is on newer i386 also the option of
using -mfpmath=sse. That's strictly
speaking the only way to get IEEE754
semantics on i386.
On NetBSD/i386 10.0 with the system's GCC-10.5 the -mfpmath=sse option
doesn't actually do anything:
Well, of course. You also need to use a CPU that supports SSE2 and/or
enable the feature with -msse2.
Joerg
