From 3f631b82faaf9c506acdb34321f8083a81cc66cd Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Mon, 6 Mar 2017 18:36:40 +0000
Subject: [PATCH] GlobalISel: add buildUndef method to MachineIRBuilder. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297044 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h | 3 +++
 lib/CodeGen/GlobalISel/IRTranslator.cpp            | 2 +-
 lib/CodeGen/GlobalISel/MachineIRBuilder.cpp        | 4 ++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h b/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
index 7d148cf2e9a..4eafe88831a 100644
--- a/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
+++ b/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
@@ -451,6 +451,9 @@ public:
   MachineInstrBuilder buildExtract(ArrayRef<unsigned> Results,
                                    ArrayRef<uint64_t> Indices, unsigned Src);
 
+  /// Build and insert \p Res = IMPLICIT_DEF.
+  MachineInstrBuilder buildUndef(unsigned Dst);
+
   /// Build and insert \p Res<def> = G_SEQUENCE \p Op0, \p Idx0...
   ///
   /// G_SEQUENCE inserts each element of Ops into an IMPLICIT_DEF register,
diff --git a/lib/CodeGen/GlobalISel/IRTranslator.cpp b/lib/CodeGen/GlobalISel/IRTranslator.cpp
index c78de71a0e2..6c403a8212a 100644
--- a/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -986,7 +986,7 @@ bool IRTranslator::translate(const Constant &C, unsigned Reg) {
   else if (auto CF = dyn_cast<ConstantFP>(&C))
     EntryBuilder.buildFConstant(Reg, *CF);
   else if (isa<UndefValue>(C))
-    EntryBuilder.buildInstr(TargetOpcode::IMPLICIT_DEF).addDef(Reg);
+    EntryBuilder.buildUndef(Reg);
   else if (isa<ConstantPointerNull>(C))
     EntryBuilder.buildConstant(Reg, 0);
   else if (auto GV = dyn_cast<GlobalValue>(&C))
diff --git a/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 5eea7268c5e..08f29f4621c 100644
--- a/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -416,6 +416,10 @@ MachineIRBuilder::buildSequence(unsigned Res,
   return MIB;
 }
 
+MachineInstrBuilder MachineIRBuilder::buildUndef(unsigned Res) {
+  return buildInstr(TargetOpcode::IMPLICIT_DEF).addDef(Res);
+}
+
 MachineInstrBuilder MachineIRBuilder::buildMerge(unsigned Res,
                                                  ArrayRef<unsigned> Ops) {
 
-- 
2.50.1