[PATCH] D99733: [GlobalISel]: Add a getConstantIntVRegVal utility

[Petar Avramovic via Phabricator via llvm-commits]

Petar.Avramovic created this revision.
Petar.Avramovic added reviewers: foad, arsenm.
Herald added subscribers: hiraditya, rovka.
Petar.Avramovic requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

Returns ConstantInt from G_CONSTANT instruction given its def register.


https://reviews.llvm.org/D99733

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
@@ -365,6 +365,14 @@
   return ValueAndVReg{Val, VReg};
 }
 
+const ConstantInt *llvm::getConstantIntVRegVal(Register VReg,
+                                               const MachineRegisterInfo &MRI) {
+  MachineInstr *MI = MRI.getVRegDef(VReg);
+  if (MI->getOpcode() != TargetOpcode::G_CONSTANT)
+    return nullptr;
+  return MI->getOperand(1).getCImm();
+}
+
 const ConstantFP *
 llvm::getConstantFPVRegVal(Register VReg, const MachineRegisterInfo &MRI) {
   MachineInstr *MI = MRI.getVRegDef(VReg);
Index: llvm/include/llvm/CodeGen/GlobalISel/Utils.h
===================================================================
--- llvm/include/llvm/CodeGen/GlobalISel/Utils.h
+++ llvm/include/llvm/CodeGen/GlobalISel/Utils.h
@@ -41,6 +41,7 @@
 class TargetPassConfig;
 class TargetRegisterInfo;
 class TargetRegisterClass;
+class ConstantInt;
 class ConstantFP;
 class APFloat;
 
@@ -189,6 +190,8 @@
                                   bool LookThroughInstrs = true,
                                   bool HandleFConstants = true,
                                   bool LookThroughAnyExt = false);
+const ConstantInt *getConstantIntVRegVal(Register VReg,
+                                         const MachineRegisterInfo &MRI);
 const ConstantFP* getConstantFPVRegVal(Register VReg,
                                        const MachineRegisterInfo &MRI);
 


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