================
@@ -106,9 +111,14 @@ static void emitSCSEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB,
CSI, [&](CalleeSavedInfo &CSR) { return CSR.getReg() == RAReg; }))
return;
+ const RISCVInstrInfo *TII = STI.getInstrInfo();
+ if (STI.hasFeature(RISCV::FeatureStdExtZicfiss)) {
----------------
topperc wrote:
As @samitolvanen wrote earlier the SSPUSH and SSPOPCHK instruction fall back to
NOPs based on configuration.
> If the kernel doesn't support Zicfiss, it presumably also hasn't enabled the
> extension for U-mode. Therefore, my understanding is that the application
> loader can simply skip shadow stack setup for the program, including the
> prctl (which would fail with -EINVAL), and since the Zicfiss (Zimop)
> instructions are no-ops when the extension is disabled, the program would run
> normally, just without shadow stacks. Does this sound correct?
https://github.com/llvm/llvm-project/pull/68075
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