[PATCH] D91263: GlobalISel: Directly expose getDefSrcRegIgnoringCopies utility

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, paquette, aditya_nandakumar, dsanders.
Herald added subscribers: hiraditya, rovka.
Herald added a project: LLVM.
arsenm requested review of this revision.
Herald added a subscriber: wdng.

It's useful to get both the instruction and register at the same time.


https://reviews.llvm.org/D91263

Files:
  llvm/include/llvm/CodeGen/GlobalISel/Utils.h
  llvm/lib/CodeGen/GlobalISel/Utils.cpp


Index: llvm/lib/CodeGen/GlobalISel/Utils.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/Utils.cpp
+++ llvm/lib/CodeGen/GlobalISel/Utils.cpp
@@ -351,13 +351,6 @@
   return MI->getOperand(1).getFPImm();
 }
 
-namespace {
-struct DefinitionAndSourceRegister {
-  MachineInstr *MI;
-  Register Reg;
-};
-} // namespace
-
 /// Return the source virtual register if this is a bit-preserving no-op cast,
 /// otherwise Register().
 static Register getCopyLikeSrcReg(const MachineInstr &MI,
@@ -389,9 +382,9 @@
   }
 }
 
-static Optional<DefinitionAndSourceRegister>
-getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI,
-                           bool CopyOnly) {
+Optional<DefinitionAndSourceRegister>
+llvm::getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI,
+                                 bool CopyOnly) {
   Register DefSrcReg = Reg;
   auto *DefMI = MRI.getVRegDef(Reg);
   auto DstTy = MRI.getType(DefMI->getOperand(0).getReg());
Index: llvm/include/llvm/CodeGen/GlobalISel/Utils.h
===================================================================
--- llvm/include/llvm/CodeGen/GlobalISel/Utils.h
+++ llvm/include/llvm/CodeGen/GlobalISel/Utils.h
@@ -151,6 +151,17 @@
 MachineInstr *getOpcodeDef(unsigned Opcode, Register Reg,
                            const MachineRegisterInfo &MRI);
 
+struct DefinitionAndSourceRegister {
+  MachineInstr *MI;
+  Register Reg;
+};
+
+/// Find the def instruction for \p Reg, and underlying value Register folding
+/// away any copies.
+Optional<DefinitionAndSourceRegister>
+getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI,
+                           bool CopyOnly = true);
+
 /// Find the def instruction for \p Reg, folding away any trivial copies. May
 /// return nullptr if \p Reg is not a generic virtual register.
 MachineInstr *getDefIgnoringCopies(Register Reg,


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