AMDGPU: Avoid report_fatal_error for getRegisterByName subtarget case (#145173)

Author: arsenm

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

@@ -4481,6 +4481,8 @@ SDValue SITargetLowering::lowerSET_FPENV(SDValue Op, SelectionDAG &DAG) const {
 
 Register SITargetLowering::getRegisterByName(const char *RegName, LLT VT,
                                              const MachineFunction &MF) const {
+  const Function &Fn = MF.getFunction();
+
   Register Reg = StringSwitch<Register>(RegName)
                      .Case("m0", AMDGPU::M0)
                      .Case("exec", AMDGPU::EXEC)
@@ -4498,8 +4500,8 @@ Register SITargetLowering::getRegisterByName(const char *RegName, LLT VT,
 
   if (!Subtarget->hasFlatScrRegister() &&
       Subtarget->getRegisterInfo()->regsOverlap(Reg, AMDGPU::FLAT_SCR)) {
-    report_fatal_error(Twine("invalid register \"" + StringRef(RegName) +
-                             "\" for subtarget."));
+    Fn.getContext().emitError(Twine("invalid register \"" + StringRef(RegName) +
+                                    "\" for subtarget."));
   }
 
   switch (Reg) {

llvm/test/CodeGen/AMDGPU/read-register-invalid-subtarget.ll

@@ -1,6 +1,6 @@
-; RUN: not --crash llc -mtriple=amdgcn -mcpu=tahiti -verify-machineinstrs < %s 2>&1 | FileCheck %s
+; RUN: not llc -mtriple=amdgcn -mcpu=tahiti -verify-machineinstrs < %s 2>&1 | FileCheck %s
 
-; CHECK: invalid register "flat_scratch_lo" for subtarget.
+; CHECK: error: invalid register "flat_scratch_lo" for subtarget.
 
 declare i32 @llvm.read_register.i32(metadata) #0