diff --git a/lib/Bytecode/Writer/Writer.cpp b/lib/Bytecode/Writer/Writer.cpp
index 98a4234a410..5218c9e8c9b 100644
--- a/lib/Bytecode/Writer/Writer.cpp
+++ b/lib/Bytecode/Writer/Writer.cpp
@@ -424,7 +424,7 @@ void BytecodeWriter::outputConstantStrings() {
 //===----------------------------------------------------------------------===//
 typedef unsigned char uchar;
 
-// outputInstructionFormat0 - Output those wierd instructions that have a large
+// outputInstructionFormat0 - Output those weird instructions that have a large
 // number of operands or have large operands themselves...
 //
 // Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index ff9e495e43e..285a806de7e 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -1549,7 +1549,7 @@ def FADDPrST0  : FPrST0PInst<0xC0, (ops RST:$op),
 
 // NOTE: GAS and apparently all other AT&T style assemblers have a broken notion
 // of some of the 'reverse' forms of the fsub and fdiv instructions.  As such,
-// we have to put some 'r's in and take them out of wierd places.
+// we have to put some 'r's in and take them out of weird places.
 def FSUBRST0r  : FPST0rInst <0xE8, (ops RST:$op),
                              "fsubr $op">;
 def FSUBrST0   : FPrST0Inst <0xE8, (ops RST:$op),
diff --git a/lib/Transforms/IPO/RaiseAllocations.cpp b/lib/Transforms/IPO/RaiseAllocations.cpp
index 4d5650f90aa..8a35bc39e6b 100644
--- a/lib/Transforms/IPO/RaiseAllocations.cpp
+++ b/lib/Transforms/IPO/RaiseAllocations.cpp
@@ -186,7 +186,7 @@ bool RaiseAllocations::runOnModule(Module &M) {
           
           // If no prototype was provided for free, we may need to cast the
           // source pointer.  This should be really uncommon, but it's necessary
-          // just in case we are dealing with wierd code like this:
+          // just in case we are dealing with weird code like this:
           //   free((long)ptr);
           //
           Value *Source = *CS.arg_begin();
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 870a90143b0..4954c7262a3 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -196,7 +196,7 @@ static bool DominatesMergePoint(Value *V, BasicBlock *BB,
   if (!I) return true;    // Non-instructions all dominate instructions.
   BasicBlock *PBB = I->getParent();
 
-  // We don't want to allow wierd loops that might have the "if condition" in
+  // We don't want to allow weird loops that might have the "if condition" in
   // the bottom of this block.
   if (PBB == BB) return false;
 
diff --git a/tools/bugpoint/Miscompilation.cpp b/tools/bugpoint/Miscompilation.cpp
index b69cbd12003..b1707042b8c 100644
--- a/tools/bugpoint/Miscompilation.cpp
+++ b/tools/bugpoint/Miscompilation.cpp
@@ -425,7 +425,7 @@ static bool ExtractBlocks(BugDriver &BD,
                                                 MiscompiledFunctions);
   Module *Extracted = BD.ExtractMappedBlocksFromModule(Blocks, ToExtract);
   if (Extracted == 0) {
-    // Wierd, extraction should have worked.
+    // Weird, extraction should have worked.
     std::cerr << "Nondeterministic problem extracting blocks??\n";
     delete ProgClone;
     delete ToExtract;