[cfarm-users] cfarm26 FP inaccuracies

[Martin Guy]

On 8/30/26 12:31 PM, Andreas Schwab wrote:
> -mfpmath=387 vs -mfpmath=sse

On cfarm26 (the too-accurate one) with -mfpmath=sse it says

     cc1: warning: SSE instruction set disabled, using 387 arithmetics

on cfarm27, (the working one) with -mfpmath=387 you get

     The arithmetic diagnosed seems Satisfactory though flawed.

So that's it. I guess

As to why the SSE instruction set is disabled on Debian bookworm's 
gcc... both machines' /proc/cpuinfo report sse and sse2.

On my home machine, -mfpmath=387 give the same single flaw.
Does this mean that all modern CPUs have 80-bit FPUs just to be able to 
emulate the 80387?!

     M