[PAC][AArch64] Lower ptrauth constants in code (#94241)

Depends on #94240.

Define the following pseudos for lowering ptrauth constants in code:

- non-`extern_weak`:
  - no GOT load needed: `MOVaddrPAC` - similar to `MOVaddr`, with added
    PAC;
  - GOT load needed: `LOADgotPAC` - similar to `LOADgot`, with added PAC;
- `extern_weak`: `LOADauthptrstatic` - similar to `LOADgot`, but use a
  special stub slot named `sym$auth_ptr$key$disc` filled by dynamic linker
  during relocation resolving instead of a GOT slot.

---------

Co-authored-by: Ahmed Bougacha <ahmed@bougacha.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index 9ea238c..0c8a0f2 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -2066,6 +2066,12 @@ void MachineVerifier::verifyPreISelGenericInstruction(const MachineInstr *MI) {
       report("Dst operand 0 must be a pointer", MI);
     break;
   }
+  case TargetOpcode::G_PTRAUTH_GLOBAL_VALUE: {
+    const MachineOperand &AddrOp = MI->getOperand(1);
+    if (!AddrOp.isReg() || !MRI->getType(AddrOp.getReg()).isPointer())
+      report("addr operand must be a pointer", &AddrOp, 1);
+    break;
+  }
   default:
     break;
   }