Revert r112432. It appears to be exposing a problem in the emacs build.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112638 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 121c6e2..863f8a6 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -3332,16 +3332,11 @@
// LLVM IR canonical form means we need only traverse the left operands.
SmallVector<const SCEV *, 4> AddOps;
AddOps.push_back(getSCEV(U->getOperand(1)));
- for (Value *Op = U->getOperand(0); ; Op = U->getOperand(0)) {
- unsigned Opcode = Op->getValueID() - Value::InstructionVal;
- if (Opcode != Instruction::Add && Opcode != Instruction::Sub)
- break;
+ for (Value *Op = U->getOperand(0);
+ Op->getValueID() == Instruction::Add + Value::InstructionVal;
+ Op = U->getOperand(0)) {
U = cast<Operator>(Op);
- const SCEV *Op1 = getSCEV(U->getOperand(1));
- if (Opcode == Instruction::Sub)
- AddOps.push_back(getNegativeSCEV(Op1));
- else
- AddOps.push_back(Op1);
+ AddOps.push_back(getSCEV(U->getOperand(1)));
}
AddOps.push_back(getSCEV(U->getOperand(0)));
return getAddExpr(AddOps);