benisxdxd wrote:
@smithp35
I have looked more into the `__chkstk` and stuff which is implemented in
`ARMISelLowering.cpp`.
Also in `Thumb1FrameLowering.cpp` R4 is used as a temporary in
```
// mov r4, sp
// lsrs r4, r4, #NrBitsToZero
// lsls r4, r4, #NrBitsToZero
// mov sp, r4
```
But I don't think it will cause an issue because it is basically and intrinsic
and is restored right afterwards.
In the system I work with `__chkstk` is not an issue (according to doc
`__chkstk` is only used on windows and on thumb 2 mode).
In `adjustForSegmentedStacks` r4 and r5 are used hardcoded but we perhaps could
change it to r5 and r6.
But yeah now I see what you meant.
I need to think about this more.
https://github.com/llvm/llvm-project/pull/89849
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