port-m68k/59616: m68k softfloat nans and infs have to be preserved when changing sizes

[nathanialsloss%yahoo.com.au@localhost]

>Number:         59616
>Category:       port-m68k
>Synopsis:       m68k softfloat nans and infs have to be preserved when changing sizes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-m68k-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 29 16:10:00 +0000 2025
>Originator:     Nat Sloss
>Release:        NetBSD-11.99.1
>Organization:
>Environment:
NetBSD princess 11.99.1 NetBSD 11.99.1 (WSFBPWR) #171: Sat Aug 23 22:27:20 AEST 2025  build@microrusty:/usr/src/sys/arch/mac68k/compile/WSFBPWR mac68k

>Description:
m68k softfloat implementation for gcc uses fpgnulib.c for gcc.

This does not expand NaNs and INFs when changing sizes.

Consider the following:

float test = 0.0/0.0;
double newtest = test;

printf("%f %f\n",test,newtest);

and the results yielded are - nan -6(big number).

it should be nan nan.

Nan and infs are not numbers so they should be given there equivalent values when changing sizes.
>How-To-Repeat:
run /usr/tests/lib/libm tests

>Fix:
Apply the patch in the followup email.

Best regards,

Nat