diff --git a/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h b/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
index ae0055ce6919..eacd13582dc6 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/InstructionSelector.h
@@ -218,7 +218,7 @@ enum {
   /// - InsnID - Instruction ID to modify
   /// - RegNum - The register to add
   GIR_AddRegister,
-  /// Add a a temporary register to the specified instruction
+  /// Add a temporary register to the specified instruction
   /// - InsnID - Instruction ID to modify
   /// - TempRegID - The temporary register ID to add
   GIR_AddTempRegister,
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp
index e89f0f855ed1..d06d96be542f 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp
@@ -218,7 +218,7 @@ Counters SIInsertWaits::getHwCounts(MachineInstr &MI) {
         unsigned Size = TRI->getRegSizeInBits(*RC);
         Result.Named.LGKM = Size > 32 ? 2 : 1;
       } else {
-        // s_dcache_inv etc. do not have a a destination register. Assume we
+        // s_dcache_inv etc. do not have a destination register. Assume we
         // want a wait on these.
         // XXX - What is the right value?
         Result.Named.LGKM = 1;
diff --git a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
index 02c6eb925ca6..95481e042b93 100644
--- a/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -358,7 +358,7 @@ int ARMTTIImpl::getVectorInstrCost(unsigned Opcode, Type *ValTy,
 int ARMTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy,
                                    const Instruction *I) {
   int ISD = TLI->InstructionOpcodeToISD(Opcode);
-  // On NEON a a vector select gets lowered to vbsl.
+  // On NEON a vector select gets lowered to vbsl.
   if (ST->hasNEON() && ValTy->isVectorTy() && ISD == ISD::SELECT) {
     // Lowering of some vector selects is currently far from perfect.
     static const TypeConversionCostTblEntry NEONVectorSelectTbl[] = {
diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index 65a2fc35b11b..e8c43de85291 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -1914,7 +1914,7 @@ void HexagonFrameLowering::determineCalleeSaves(MachineFunction &MF,
   if (OptimizeSpillSlots && !isOptNone(MF))
     optimizeSpillSlots(MF, NewRegs);
 
-  // We need to reserve a a spill slot if scavenging could potentially require
+  // We need to reserve a spill slot if scavenging could potentially require
   // spilling a scavenged register.
   if (!NewRegs.empty() || mayOverflowFrameOffset(MF)) {
     MachineFrameInfo &MFI = MF.getFrameInfo();
diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index f36a4317b1b9..5bcddb704a8d 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -3885,7 +3885,7 @@ bool MipsAsmParser::expandCondBranches(MCInst &Inst, SMLoc IDLoc,
   // This is accomplished by using a BNEZ with the result of the SLT.
   //
   // The other 2 pseudo-branches are opposites of the above 2 (BGE with BLT
-  // and BLE with BGT), so we change the BNEZ into a a BEQZ.
+  // and BLE with BGT), so we change the BNEZ into a BEQZ.
   // Because only BGE and BLE branch on equality, we can use the
   // AcceptsEquality variable to decide when to emit the BEQZ.
   // Note that the order of the SLT arguments doesn't change between
diff --git a/llvm/test/tools/llvm-xray/X86/extract-all-sledtypes.txt b/llvm/test/tools/llvm-xray/X86/extract-all-sledtypes.txt
index a4ac925cbd65..f9942d190c88 100644
--- a/llvm/test/tools/llvm-xray/X86/extract-all-sledtypes.txt
+++ b/llvm/test/tools/llvm-xray/X86/extract-all-sledtypes.txt
@@ -1,5 +1,5 @@
 # Test that we can extract all the sled types we know about. This is built with
-# a a file with functions always instrumented, and using the built-ins and
+# a file with functions always instrumented, and using the built-ins and
 # intrinsics supported by clang. Those are built with:
 #
 #   clang++ -c all-sleds.cc -o all-sleds.o -fpic -std=c++11 -fxray-instrument
diff --git a/llvm/tools/llvm-readobj/COFFDumper.cpp b/llvm/tools/llvm-readobj/COFFDumper.cpp
index 40334802d8ef..f40e0d9c9a37 100644
--- a/llvm/tools/llvm-readobj/COFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/COFFDumper.cpp
@@ -244,7 +244,7 @@ std::error_code createCOFFDumper(const object::ObjectFile *Obj,
 
 } // namespace llvm
 
-// Given a a section and an offset into this section the function returns the
+// Given a section and an offset into this section the function returns the
 // symbol used for the relocation at the offset.
 std::error_code COFFDumper::resolveSymbol(const coff_section *Section,
                                           uint64_t Offset, SymbolRef &Sym) {