| Issue |
89529
|
| Summary |
flang-new 19.0.0 bug: `nan > 0`, `nan > 1`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
zaikunzhang
|
Hi,
This is a bug of flang-new 19.0.0, when invoked with `-Ofast` (This is not recommended in general. I know).
Code (latest version available at https://github.com/zequipe/test_compiler/blob/master/test_flang_nan.f90):
```fortran
! test_flang_nan
program test_flang_nan
use ieee_arithmetic, only : ieee_value, ieee_signaling_nan, ieee_quiet_nan
! The problem occurs with REAL64 and REAL32, not REAL16 or REAL128.
use iso_fortran_env, only : RP => REAL32 !REAL64
implicit none
real(RP) :: nan
nan = ieee_value(0.0_RP, ieee_signaling_nan)
! nan = ieee_value(0.0_RP, ieee_quiet_nan) ! The same problem
print *, nan > 0, nan > 1, nan < 0, nan < 1
if (nan > 0 .or. nan > 1 .or. nan < 0 .or. nan < 1) then
error stop 1
end if
end program test_flang_nan
```
Test:
```bash
uname -a && flang --version && flang -Ofast test_flang_nan.f90 && ./a.out
```
Result:
```text
Linux 6.5.0-28-generic #29~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr 4 14:39:20 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
flang-new version 19.0.0git (g...@github.com:llvm/llvm-project.git 37c175af955f0aeab67e8c553a0a47b2ed0fdba2)
Target: x86_64-unknown-linux-gnu
Thread model: posix
T T F F
Fortran ERROR STOP: code 1
IEEE arithmetic exceptions signaled: INVALID
```
Thank you for taking a look.
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