https://bugs.llvm.org/show_bug.cgi?id=49957
Bug ID: 49957
Summary: PAC+BTI+B-KEY inefficient codegen
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected],
[email protected], [email protected],
[email protected]
int f() {
g();
return 42;
}
With -mbranch-protection=standard,
_Z1fv():
0: d503233f paciasp
4: a9bf7bfd stp x29, x30, [sp, #-16]!
With -mbranch-protection=bti+pac-ret+b-key,
_Z1fv():
0: d503245f bti c
4: d503237f pacibsp
8: a9bf7bfd stp x29, x30, [sp, #-16]!
Seems trivial, AArch64BranchTargets::addBTI needs to skip over EMITBKEY.
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