ADT/STLExtras: Introduce llvm::empty; NFC

This is modeled after C++17 std::empty().

Differential Revision: https://reviews.llvm.org/D53909

llvm-svn: 345679

4 files changed, 4 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp b/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
index 5e77fcbb0ed..38913e4afcb 100644
--- a/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
@@ -80,5 +80,5 @@ bool InstructionSelector::isObviouslySafeToFold(MachineInstr &MI,
     return true;
 
   return !MI.mayLoadOrStore() && !MI.hasUnmodeledSideEffects() &&
-         MI.implicit_operands().begin() == MI.implicit_operands().end();
+         empty(MI.implicit_operands());
 }
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerInfo.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerInfo.cpp
index b6ed2654bd0..ca776de0a0f 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerInfo.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerInfo.cpp
@@ -298,8 +298,7 @@ LegalizeRuleSet &LegalizerInfo::getActionDefinitionsBuilder(
     std::initializer_list<unsigned> Opcodes) {
   unsigned Representative = *Opcodes.begin();
 
-  assert(Opcodes.begin() != Opcodes.end() &&
-         Opcodes.begin() + 1 != Opcodes.end() &&
+  assert(!empty(Opcodes) && Opcodes.begin() + 1 != Opcodes.end() &&
          "Initializer list must have at least two opcodes");
 
   for (auto I = Opcodes.begin() + 1, E = Opcodes.end(); I != E; ++I)
diff --git a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
index 9e2d48d1dc4..6bb48dc2e8a 100644
--- a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
@@ -140,7 +140,7 @@ bool RegBankSelect::repairReg(
     return false;
   assert(ValMapping.NumBreakDowns == 1 && "Not yet implemented");
   // An empty range of new register means no repairing.
-  assert(NewVRegs.begin() != NewVRegs.end() && "We should not have to repair");
+  assert(!empty(NewVRegs) && "We should not have to repair");
 
   // Assume we are repairing a use and thus, the original reg will be
   // the source of the repairing.
diff --git a/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp b/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
index dd15567ef1c..28404e52d6e 100644
--- a/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
@@ -426,7 +426,7 @@ void RegisterBankInfo::applyDefaultMapping(const OperandsMapper &OpdMapper) {
            "This mapping is too complex for this function");
     iterator_range<SmallVectorImpl<unsigned>::const_iterator> NewRegs =
         OpdMapper.getVRegs(OpIdx);
-    if (NewRegs.begin() == NewRegs.end()) {
+    if (empty(NewRegs)) {
       LLVM_DEBUG(dbgs() << " has not been repaired, nothing to be done\n");
       continue;
     }