================
@@ -2497,7 +2497,8 @@ AArch64FrameLowering::getFrameIndexReference(const
MachineFunction &MF, int FI,
return resolveFrameIndexReference(
MF, FI, FrameReg,
/*PreferFP=*/
- MF.getFunction().hasFnAttribute(Attribute::SanitizeHWAddress),
+ MF.getFunction().hasFnAttribute(Attribute::SanitizeHWAddress) ||
+ MF.getFunction().hasFnAttribute(Attribute::SanitizeMemTag),
/*ForSimm=*/false);
----------------
eugenis wrote:
So this will cause most of the local references to use FP, but our "base tagged
pointer" is SP-based (see the aarch64_irg_sp intrinsic). Would not that
pessimize the codegen a lot? Please check that nothing stupid is happening in
the backend.
There is a bunch of relevant tests under test/CodeGen/AArch64/stack-tagging-*
https://github.com/llvm/llvm-project/pull/86356
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