https://bugs.llvm.org/show_bug.cgi?id=50553
Bug ID: 50553
Summary: Link register not saved across Statepoint call sites
Product: libraries
Version: 12.0
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected],
[email protected], [email protected],
[email protected]
On Aarch64, it seems that the link register isn't saved across statepoint call
sites, causing general havoc.
The workaround appears to be to forcibly enable frame pointers for non-leaf
functions, but there may be other register issues that are not as obvious.
Using `llc -march=aarch64`, it can be shown with a simple program that the
branch does not preserve the link register. Here's the example on godbolt:
https://godbolt.org/z/a7oYva4Eb
As can be seen, forcing the frame pointer to be used fixes the issue.
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