diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index 03855f6bac4..6be2efdcc53 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -441,6 +441,25 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) { return replaceInstUsesWith(I, Sqrt); } + // Like the similar transform in instsimplify, this requires 'nsz' because + // sqrt(-0.0) = -0.0, and -0.0 * -0.0 does not simplify to -0.0. + if (I.hasNoNaNs() && I.hasNoSignedZeros() && Op0 == Op1 && + Op0->hasNUses(2)) { + // Peek through fdiv to find squaring of square root: + // (X / sqrt(Y)) * (X / sqrt(Y)) --> (X * X) / Y + if (match(Op0, m_FDiv(m_Value(X), + m_Intrinsic<Intrinsic::sqrt>(m_Value(Y))))) { + Value *XX = Builder.CreateFMulFMF(X, X, &I); + return BinaryOperator::CreateFDivFMF(XX, Y, &I); + } + // (sqrt(Y) / X) * (sqrt(Y) / X) --> Y / (X * X) + if (match(Op0, m_FDiv(m_Intrinsic<Intrinsic::sqrt>(m_Value(Y)), + m_Value(X)))) { + Value *XX = Builder.CreateFMulFMF(X, X, &I); + return BinaryOperator::CreateFDivFMF(Y, XX, &I); + } + } + // exp(X) * exp(Y) -> exp(X + Y) // Match as long as at least one of exp has only one use. if (match(Op0, m_Intrinsic<Intrinsic::exp>(m_Value(X))) && |
