| Issue |
135083
|
| Summary |
Luxmark crashes on Mesa Clover with LLVM Error: Cannot select: 0x7fdadb775150: i32 = is_fpclass 0x7fdadbf90ad0, TargetConstant:i32<504>
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Elefant-Freeciv
|
To reproduce:
- On Debian Sid
- with a terascale 2 GPU (other terascale gpus may also be affected)
- running Mesa 25.0.3-1/LLVM 19.1.7
- download and run Luxmark V3.1
This gives the following error:
```
./luxmark
LLVM ERROR: Cannot select: 0x7fdadb775150: i32 = is_fpclass 0x7fdadbf90ad0, TargetConstant:i32<504>
0x7fdadbf90ad0: f32 = extract_vector_elt 0x7fdad911c920, Constant:i32<1>
0x7fdad911c920: v2f32 = bitcast 0x7fdad8eec650
0x7fdad8eec650: v2i32,ch = load<(load (s64) from %ir.sunkaddr, align 4, !tbaa !14, addrspace 1)> 0x7fdaf3951948, 0x7fdad8eed740, undef:i32
0x7fdad8eed740: i32 = add nuw 0x7fdad8e286f0, Constant:i32<8>
0x7fdad8e286f0: i32,ch = CopyFromReg 0x7fdaf3951948, Register:i32 %4
0x7fdad8eed4a0: i32 = Register %4
0x7fdad8eedcf0: i32 = Constant<8>
0x7fdad90f7840: i32 = undef
0x7fdadbf90360: i32 = Constant<1>
0x7fdadb775d20: i32 = TargetConstant<504>
In function: AdvancePaths_MK_SPLAT_SAMPLE
./luxmark: line 12: 12037 Aborted ./luxmark.bin "$@"
```
Similar errors result from other Opencl applications.
`clpeak` seg faults instead:
```
Starting program: /usr/bin/clpeak
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffdc7ff6c0 (LWP 11482)]
[New Thread 0x7fffdbffe6c0 (LWP 11483)]
[New Thread 0x7fffdd1ff6c0 (LWP 11484)]
[New Thread 0x7fffdb7fd6c0 (LWP 11485)]
Platform: Clover
Device: AMD CAICOS (DRM 2.50.0 / 6.12.21-amd64, LLVM 19.1.7)
Driver version : 25.0.3-1 (Linux x64)
Compute units : 2
Clock frequency : 625 MHz
Thread 1 "clpeak" received signal SIGSEGV, Segmentation fault.
0x00007fffdf0c6bf4 in llvm::TargetRegisterInfo::getMatchingSuperRegClass(llvm::TargetRegisterClass const*, llvm::TargetRegisterClass const*, unsigned int) const ()
from /lib/x86_64-linux-gnu/libLLVM.so.19.1
```
This entirely breaks OpenCL on Mesa on Debian Sid.
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