[llvm] r324867 - [NFC] Fix typos

[Max Kazantsev via llvm-commits]

Author: mkazantsev
Date: Sun Feb 11 21:16:28 2018
New Revision: 324867

URL: http://llvm.org/viewvc/llvm-project?rev=324867&view=rev
Log:
[NFC] Fix typos

Modified:
    llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp?rev=324867&r1=324866&r2=324867&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp Sun Feb 11 21:16:28 2018
@@ -1633,30 +1633,30 @@ InductiveRangeCheck::computeSafeIteratio
   unsigned BitWidth = cast<IntegerType>(IndVar->getType())->getBitWidth();
   const SCEV *SIntMax = SE.getConstant(APInt::getSignedMaxValue(BitWidth));
 
-  // Substract Y from X so that it does not go through border of the IV
+  // Subtract Y from X so that it does not go through border of the IV
   // iteration space. Mathematically, it is equivalent to:
   //
-  //    ClampedSubstract(X, Y) = min(max(X - Y, INT_MIN), INT_MAX).        [1]
+  //    ClampedSubtract(X, Y) = min(max(X - Y, INT_MIN), INT_MAX).        [1]
   //
-  // In [1], 'X - Y' is a mathematical substraction (result is not bounded to
+  // In [1], 'X - Y' is a mathematical subtraction (result is not bounded to
   // any width of bit grid). But after we take min/max, the result is
   // guaranteed to be within [INT_MIN, INT_MAX].
   //
   // In [1], INT_MAX and INT_MIN are respectively signed and unsigned max/min
   // values, depending on type of latch condition that defines IV iteration
   // space.
-  auto ClampedSubstract = [&](const SCEV *X, const SCEV *Y) {
+  auto ClampedSubtract = [&](const SCEV *X, const SCEV *Y) {
     if (IsLatchSigned) {
       // X is a number from signed range, Y is interpreted as signed.
       // Even if Y is SINT_MAX, (X - Y) does not reach SINT_MIN. So the only
       // thing we should care about is that we didn't cross SINT_MAX.
-      // So, if Y is positive, we substract Y safely.
+      // So, if Y is positive, we subtract Y safely.
       //   Rule 1: Y > 0 ---> Y.
-      // If 0 <= -Y <= (SINT_MAX - X), we substract Y safely.
+      // If 0 <= -Y <= (SINT_MAX - X), we subtract Y safely.
       //   Rule 2: Y >=s (X - SINT_MAX) ---> Y.
-      // If 0 <= (SINT_MAX - X) < -Y, we can only substract (X - SINT_MAX).
+      // If 0 <= (SINT_MAX - X) < -Y, we can only subtract (X - SINT_MAX).
       //   Rule 3: Y <s (X - SINT_MAX) ---> (X - SINT_MAX).
-      // It gives us smax(Y, X - SINT_MAX) to substract in all cases.
+      // It gives us smax(Y, X - SINT_MAX) to subtract in all cases.
       const SCEV *XMinusSIntMax = SE.getMinusSCEV(X, SIntMax);
       return SE.getMinusSCEV(X, SE.getSMaxExpr(Y, XMinusSIntMax),
                              SCEV::FlagNSW);
@@ -1664,19 +1664,19 @@ InductiveRangeCheck::computeSafeIteratio
       // X is a number from unsigned range, Y is interpreted as signed.
       // Even if Y is SINT_MIN, (X - Y) does not reach UINT_MAX. So the only
       // thing we should care about is that we didn't cross zero.
-      // So, if Y is negative, we substract Y safely.
+      // So, if Y is negative, we subtract Y safely.
       //   Rule 1: Y <s 0 ---> Y.
-      // If 0 <= Y <= X, we substract Y safely.
+      // If 0 <= Y <= X, we subtract Y safely.
       //   Rule 2: Y <=s X ---> Y.
-      // If 0 <= X < Y, we should stop at 0 and can only substract X.
+      // If 0 <= X < Y, we should stop at 0 and can only subtract X.
       //   Rule 3: Y >s X ---> X.
-      // It gives us smin(X, Y) to substract in all cases.
+      // It gives us smin(X, Y) to subtract in all cases.
       return SE.getMinusSCEV(X, SE.getSMinExpr(X, Y), SCEV::FlagNUW);
   };
   const SCEV *M = SE.getMinusSCEV(C, A);
   const SCEV *Zero = SE.getZero(M->getType());
-  const SCEV *Begin = ClampedSubstract(Zero, M);
-  const SCEV *End = ClampedSubstract(getEnd(), M);
+  const SCEV *Begin = ClampedSubtract(Zero, M);
+  const SCEV *End = ClampedSubtract(getEnd(), M);
   return InductiveRangeCheck::Range(Begin, End);
 }