diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar/SCCP.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/SCCP.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp index 9c5fa5c1426..334642fe35d 100644 --- a/llvm/lib/Transforms/Scalar/SCCP.cpp +++ b/llvm/lib/Transforms/Scalar/SCCP.cpp @@ -910,6 +910,12 @@ void SCCPSolver::visitBinaryOperator(Instruction &I) { // Otherwise, one of our operands is overdefined. Try to produce something // better than overdefined with some tricks. + // If this is 0 / Y, it doesn't matter that the second operand is + // overdefined, and we can replace it with zero. + if (I.getOpcode() == Instruction::UDiv || I.getOpcode() == Instruction::SDiv) + if (V1State.isConstant() && V1State.getConstant()->isNullValue()) + return markConstant(IV, &I, V1State.getConstant()); + // If this is: // -> AND/MUL with 0 // -> OR with -1 |
