diff options
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCasts.cpp')
-rw-r--r-- | lib/Transforms/InstCombine/InstCombineCasts.cpp | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp index 555b4428d2..b8b61d721a 100644 --- a/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -381,7 +381,7 @@ static bool CanEvaluateTruncated(Value *V, Type *Ty) { break; case Instruction::LShr: // If this is a truncate of a logical shr, we can truncate it to a smaller - // lshr iff we know that the bits we would otherwise be shifting in are + // lshr if we know that the bits we would otherwise be shifting in are // already zeros. if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) { uint32_t OrigBitWidth = OrigTy->getScalarSizeInBits(); @@ -527,14 +527,14 @@ Instruction *InstCombiner::transformZExtICmp(ICmpInst *ICI, Instruction &CI, return ReplaceInstUsesWith(CI, In); } - // zext (X == 0) to i32 --> X^1 iff X has only the low bit set. - // zext (X == 0) to i32 --> (X>>1)^1 iff X has only the 2nd bit set. - // zext (X == 1) to i32 --> X iff X has only the low bit set. - // zext (X == 2) to i32 --> X>>1 iff X has only the 2nd bit set. - // zext (X != 0) to i32 --> X iff X has only the low bit set. - // zext (X != 0) to i32 --> X>>1 iff X has only the 2nd bit set. - // zext (X != 1) to i32 --> X^1 iff X has only the low bit set. - // zext (X != 2) to i32 --> (X>>1)^1 iff X has only the 2nd bit set. + // zext (X == 0) to i32 --> X^1 if X has only the low bit set. + // zext (X == 0) to i32 --> (X>>1)^1 if X has only the 2nd bit set. + // zext (X == 1) to i32 --> X if X has only the low bit set. + // zext (X == 2) to i32 --> X>>1 if X has only the 2nd bit set. + // zext (X != 0) to i32 --> X if X has only the low bit set. + // zext (X != 0) to i32 --> X>>1 if X has only the 2nd bit set. + // zext (X != 1) to i32 --> X^1 if X has only the low bit set. + // zext (X != 2) to i32 --> (X>>1)^1 if X has only the 2nd bit set. if ((Op1CV == 0 || Op1CV.isPowerOf2()) && // This only works for EQ and NE ICI->isEquality()) { |