| Issue |
136971
|
| Summary |
[flang][LoongArch] Runtime error in spec2017 527.cam4_r with size=ref and optimization levels "-O3"/"-Ofast"
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
azuresky01
|
Tested OS: Debian sid/experimental loong64 installed with llvm 20.1.3
Optimization setting:
`COPTIMIZE = -g -Ofast -march=la464 -flto=auto`
`FOPTIMIZE = -g -Ofast -march=la464 -flto=auto`
When I test spec2017 527.cam4_r with above optimization setting and ref size, I met the following error:
```
run_base_refrate_mytest_llvm_20d1d3-m64.0000 -f compare.cmd -E -e compare.err -o compare.stdout'; no non-empty output files exist
Command returned exit code 1
****************************************
Contents of cam4_r_base.mytest_llvm_20d1d3-m64.err
****************************************
Fortran STOP
IEEE arithmetic exceptions signaled: DIVBYZERO INEXACT INVALID OVERFLOW UNDERFLOW
****************************************
*** Miscompare of cam4_validate.txt
```
The content in miscomparison file is:
```
0001: PASS: 4 points.
PASS: 0 points.
^
```
The above error still appears when I change the optimization level of Fortran part to `-O3`. If the optimization level of Fortran part is `-O2` or lower, the program can run smoothly.
The above error only appears with ref size, with test/train sizes the program can run smoothly at optimization level of Fortran part `-Ofast`.
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