[llvm] [AMDGPU] Handled G_UBSANTRAP GlobalIsel (PR #134492)

[Matt Arsenault via llvm-commits]

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@@ -7045,6 +7047,28 @@ bool AMDGPULegalizerInfo::legalizeDebugTrap(MachineInstr &MI,
   return true;
 }
 
+bool AMDGPULegalizerInfo::legalizeUbsanTrap(MachineInstr &MI,
+                                            MachineRegisterInfo &MRI,
+                                            MachineIRBuilder &B) const {
+  // Is non-HSA path or trap-handler disabled? Then, report a warning
+  // accordingly
+  if (!ST.isTrapHandlerEnabled() ||
+      ST.getTrapHandlerAbi() != GCNSubtarget::TrapHandlerAbi::AMDHSA) {
+    DiagnosticInfoUnsupported NoTrap(B.getMF().getFunction(),
+                                     "ubsantrap handler not supported",
+                                     MI.getDebugLoc(), DS_Warning);
+    LLVMContext &Ctx = B.getContext();
+    Ctx.diagnose(NoTrap);
+  } else {
+    // Insert trap instruction
+    B.buildInstr(AMDGPU::S_TRAP)
+        .addImm(static_cast<unsigned>(GCNSubtarget::TrapID::LLVMAMDHSATrap));
+  }
+
+  MI.eraseFromParent();
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arsenm wrote:

It has to be modified or erased otherwise it will be a legalization loop 

https://github.com/llvm/llvm-project/pull/134492