[PATCH] D77795: [GlobalISel] translate freeze to COPY

[Dominik Montada via Phabricator via llvm-commits]

gargaroff updated this revision to Diff 256269.
gargaroff added a comment.

remove unrelated style changes from diff


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77795/new/

https://reviews.llvm.org/D77795

Files:
  llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
  llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll


Index: llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
===================================================================
--- llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
+++ llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
@@ -2360,4 +2360,14 @@
   ret i64 %res
 }
 
+define i64 @test_freeze() {
+  ; CHECK-LABEL: name:            test_freeze
+  ; CHECK: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
+  ; CHECK-NEXT: [[RES:%[0-9]+]]:_(s64) = COPY [[C]]
+  ; CHECK-NEXT: $x0 = COPY [[RES]]
+  ; CHECK-NEXT: RET_ReallyLR implicit $x0
+  %res = freeze i64 0
+  ret i64 %res
+}
+
 !0 = !{ i64 0, i64 2 }
Index: llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -2104,6 +2104,17 @@
   return true;
 }
 
+bool IRTranslator::translateFreeze(const llvm::User &U,
+                                   llvm::MachineIRBuilder &MIRBuilder) {
+  // TODO: We don't have FREEZE pseudo-instruction in MachineInstr-level now.
+  // If FREEZE instruction is added later, the code below must be changed as
+  // well.
+  const Register DstReg = getOrCreateVReg(U);
+  const Register SrcReg = getOrCreateVReg(*U.getOperand(0));
+  MIRBuilder.buildCopy(DstReg, SrcReg);
+  return true;
+}
+
 void IRTranslator::finishPendingPhis() {
 #ifndef NDEBUG
   DILocationVerifier Verifier;
Index: llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
===================================================================
--- llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
+++ llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
@@ -453,6 +453,7 @@
   bool translateAtomicCmpXchg(const User &U, MachineIRBuilder &MIRBuilder);
   bool translateAtomicRMW(const User &U, MachineIRBuilder &MIRBuilder);
   bool translateFence(const User &U, MachineIRBuilder &MIRBuilder);
+  bool translateFreeze(const User &U, MachineIRBuilder &MIRBuilder);
 
   // Stubs to keep the compiler happy while we implement the rest of the
   // translation.
@@ -483,9 +484,6 @@
   bool translateUserOp2(const User &U, MachineIRBuilder &MIRBuilder) {
     return false;
   }
-  bool translateFreeze(const User &U, MachineIRBuilder &MIRBuilder) {
-    return false;
-  }
 
   /// @}
 


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