From e3b557809604d036af6e00c60f012c2025b59a5e Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 11 Feb 2023 13:38:04 +0100
Subject: Vendor import of llvm-project main
 llvmorg-16-init-18548-gb0daacf58f41, the last commit before the upstream
 release/17.x branch was created.

---
 llvm/lib/CodeGen/MachineSSAContext.cpp | 42 ++++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 5 deletions(-)

(limited to 'llvm/lib/CodeGen/MachineSSAContext.cpp')

diff --git a/llvm/lib/CodeGen/MachineSSAContext.cpp b/llvm/lib/CodeGen/MachineSSAContext.cpp
index 01cea85ecc7c..6de8f8da9254 100644
--- a/llvm/lib/CodeGen/MachineSSAContext.cpp
+++ b/llvm/lib/CodeGen/MachineSSAContext.cpp
@@ -21,20 +21,52 @@
 
 using namespace llvm;
 
-MachineBasicBlock *MachineSSAContext::getEntryBlock(MachineFunction &F) {
-  return &F.front();
-}
+const Register MachineSSAContext::ValueRefNull{};
 
 void MachineSSAContext::setFunction(MachineFunction &Fn) {
   MF = &Fn;
   RegInfo = &MF->getRegInfo();
 }
 
-Printable MachineSSAContext::print(MachineBasicBlock *Block) const {
+MachineBasicBlock *MachineSSAContext::getEntryBlock(MachineFunction &F) {
+  return &F.front();
+}
+
+void MachineSSAContext::appendBlockTerms(
+    SmallVectorImpl<const MachineInstr *> &terms,
+    const MachineBasicBlock &block) {
+  for (auto &T : block.terminators())
+    terms.push_back(&T);
+}
+
+void MachineSSAContext::appendBlockDefs(SmallVectorImpl<Register> &defs,
+                                        const MachineBasicBlock &block) {
+  for (const MachineInstr &instr : block.instrs()) {
+    for (const MachineOperand &op : instr.operands()) {
+      if (op.isReg() && op.isDef())
+        defs.push_back(op.getReg());
+    }
+  }
+}
+
+/// Get the defining block of a value.
+MachineBasicBlock *MachineSSAContext::getDefBlock(Register value) const {
+  if (!value)
+    return nullptr;
+  return RegInfo->getVRegDef(value)->getParent();
+}
+
+bool MachineSSAContext::isConstantValuePhi(const MachineInstr &Phi) {
+  return Phi.isConstantValuePHI();
+}
+
+Printable MachineSSAContext::print(const MachineBasicBlock *Block) const {
+  if (!Block)
+    return Printable([](raw_ostream &Out) { Out << "<nullptr>"; });
   return Printable([Block](raw_ostream &Out) { Block->printName(Out); });
 }
 
-Printable MachineSSAContext::print(MachineInstr *I) const {
+Printable MachineSSAContext::print(const MachineInstr *I) const {
   return Printable([I](raw_ostream &Out) { I->print(Out); });
 }
 
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