| Issue |
109304
|
| Summary |
acle-fmv-features.c fails on Fedora
|
| Labels |
test-suite,
backend:AArch64
|
| Assignees |
|
| Reporter |
nikic
|
This test from llvm-test-suite (https://github.com/llvm/llvm-test-suite/blob/main/SingleSource/UnitTests/AArch64/acle-fmv-features.c) fails on Fedora with the following output:
```
flagm
flagm2
dotprod
sha3
rdm
lse
sha2
sha1
aes
pmull
rcpc
rcpc2
fcma
jscvt
dpb
dpb2
bf16
i8mm
dit
fp16
ssbs2
UPASS
bti
simd
fp
crc
sme
sme2
```
Note the `UPASS` on ssbs2. This indicates that the `ssbs` feature was not detected as available, but executing the assembly code for it did not crash. The assembly is (https://github.com/llvm/llvm-test-suite/blob/e77ce1bfc8dbe38b9bf5a3098cb954e58d125020/SingleSource/UnitTests/AArch64/acle-fmv-features.c#L189-L195):
```c
asm volatile (
"mrs x0, SSBS" "\n"
"msr SSBS, x0" "\n"
: : : "x0"
);
```
I'm not sure whether this indicates some kind of kernel bug where a trap is incorrectly suppressed, or an incorrect assumption in the test that this necessarily has to trap (rather than, say, being silently ignored).
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