lib/57419: Automated test failures on RPi0W related to floating point math processor

[jspath55%gmail.com@localhost]

>Number:         57419
>Category:       lib
>Synopsis:       Automated test failures on RPi0W related to floating point math processor
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 18 00:40:00 +0000 2023
>Originator:     Jim Spath
>Release:        10.0_BETA
>Organization:
>Environment:
NetBSD nzerow 10.0_BETA NetBSD 10.0_BETA (RPI) #0: Mon May 15 10:40:13 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/RPI evbarm

>Description:
I ran the full automated test framework on a Raspberry Pi 0 W. Among the failures were 10 test cases, each related to floating point math.

lib/libc/gen/t_fpclassify:fpclassify_double,
lib/libc/gen/t_fpclassify:fpclassify_float,
lib/libc/gen/t_fpsetmask:fpsetmask_unmasked_double,
lib/libc/gen/t_fpsetmask:fpsetmask_unmasked_float,
lib/libc/gen/t_fpsetmask:fpsetmask_unmasked_long_double,
lib/libc/gen/t_siginfo:sigfpe_flt,
lib/libm/t_exp:exp2_powers,
lib/libm/t_ldexp:ldexp_denormal,
lib/libm/t_ldexp:ldexp_denormal_large,
lib/libm/t_ldexp:ldexp_underflow,

One example from above:

tps-count: 1
tp-start: 1684316405.482514, lib/libm/t_exp, 1
tc-start: 1684316405.482848, exp2_powers
tc-se:*** Check failed: subtest 23: exp2f(-127) is 0 (0x0.00000000000000p+0) not 5.87747e-39 (0x1.0000000000000p-127), error 1 (0x1.000000p+0) > 0
tc-se:*** Check failed: subtest 24: exp2f(-128) is 0 (0x0.00000000000000p+0) not 2.93874e-39 (0x1.0000000000000p-128), error 1 (0x1.000000p+0) > 0
tc-end: 1684316405.556077, exp2_powers, failed, 2 checks failed; see output for more details
tp-end: 1684316405.569460, lib/libm/t_exp

One reference I found related to this:

https://mail-index.netbsd.org/port-arm/2015/02/23/msg002872.html
"earmv6hf IEEE754 underflow problem"

That thread ends with:
https://mail-index.netbsd.org/port-arm/2015/02/25/msg002882.html
~
"The armv6 vfp needs exception code to do denormals properly and that code has not been written.  Until that code is written, flush to zero is enforced."
~



>How-To-Repeat:
Run the listed test cases on a Pi Zero W.
>Fix:
Unknown.