| Issue |
140534
|
| Summary |
Clang 19 regression: SIGFPE on -O2
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
roe85
|
I tried compiling our codebase and I get SIGFPE in a innocent looking function.
I've added `noinline`, to isolate it further. When called deep in the call tree it crashes with SIGFPE (which should be impossible with the given datatypes)
If I call it in an isolated unit-test with the very same parameters `(3,0, 200)` it works as expected
```
[[clang::noinline]]
/*static*/ bool SomeClass::checkIfObjTooBig(uint size_radial, uint size_azimuthal, uint max)
{
return (size_azimuthal > sqrt(2) * max ||
size_radial > sqrt(2) * max);
}
```
The generated Assembly with the supposed crash location.
```
mov %esi,%eax
cvtsi2sd %rax,%xmm0
mov %edx,%eax
cvtsi2sd %rax,%xmm1
mulsd 0x2eb12(%rip),%xmm1 # 0x57bfb8
mov %edi,%eax
cvtsi2sd %rax,%xmm2
movapd %xmm1,%xmm3
cmpltpd %xmm2,%xmm3 #<- Supposedly SIGFPE happens here
cmpltpd %xmm0,%xmm1
orpd %xmm3,%xmm1
movd %xmm1,%eax
and $0x1,%al
retq
```
Command line parameters:
```
-D_REENTRANT -m64 -march=x86-64 -pipe -fno-strict-aliasing -O2 -g -DNDEBUG -std=c++14
```
Could it be that some (parts of) registers are polluted and not really cleared beforehand?
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