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target/6234: HPPA NaN compares wrong

From: Per dot Mildner at sics dot se
To: gcc-gnats at gcc dot gnu dot org
Date: 9 Apr 2002 13:31:56 -0000
Subject: target/6234: HPPA NaN compares wrong
Reply-to: Per dot Mildner at sics dot se

>Number:         6234
>Category:       target
>Synopsis:       HPPA NaN compares wrong
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 09 06:36:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Per Mildner
>Release:        2.95.2
>Organization:
>Environment:
HP-UX muneca B.11.00 A 9000/780
>Description:
In some cases comparing a not-a-number against an ordinary floating point value comes out true.
>How-To-Repeat:
If the right code is generated then the it should print out GOOD

bash-2.04$ gcc -v -save-temps -Wall -O2 -fno-strict-aliasing gcc_nan_bug.c -lm -o gcc_nan_bug.exe && ./gcc_nan_bug.exe && echo OK
Reading specs from /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/specs
gcc version 2.95.2 19991024 (release)
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/cpp -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=95 -Dhppa -Dhp9000s800 -D__hp9000s800 -Dhp9k8 -DPWB -Dhpux -Dunix -D__hppa__ -D__hp9000s800__ -D__hp9000s800 -D__hp9k8__ -D__PWB__ -D__hpux__ -D__unix__ -D__hppa -D__hp9000s800 -D__hp9k8 -D__PWB -D__hpux -D__unix -Asystem(unix) -Asystem(hpux) -Acpu(hppa) -Amachine(hppa) -D__OPTIMIZE__ -Wall -D__hp9000s700 -D_PA_RISC1_1 -D_HPUX_SOURCE -D_HIUX_SOURCE -D__STDC_EXT__ gcc_nan_bug.c gcc_nan_bug.i
GNU CPP version 2.95.2 19991024 (release) (hppa)
#include "..." search starts here:
#include <...> search starts here:
 /src/sicstus/install/hppa-hpux-B.11.00/include
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/../../../../hppa2.0n-hp-hpux11.00/include
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/../../../../include/g++-3
End of omitted list.
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/cc1 gcc_nan_bug.i -quiet -dumpbase gcc_nan_bug.c -O2 -Wall -version -fno-strict-aliasing -o gcc_nan_bug.s
GNU C version 2.95.2 19991024 (release) (hppa2.0n-hp-hpux11.00) compiled by CC.
 as -o gcc_nan_bug.o gcc_nan_bug.s
 /src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2/collect2 -L/lib/pa1.1 -L/usr/lib/pa1.1 -z -u main -o gcc_nan_bug.exe /lib/crt0.o -L/src/sicstus/install/hppa-hpux-B.11.00/lib/gcc-lib/hppa2.0n-hp-hpux11.00/2.95.2 -L/src/sicstus/install/hppa-hpux-B.11.00/lib gcc_nan_bug.o -lm -lgcc -lc -lgcc
isnan(posnan) posnan is nan
ERROR
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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