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Fold a binary operator with constant operands when expanding code for a SCEV.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37602 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2007-06-15 19:21:55 +00:00
parent c2c28fc24c
commit 0f0eb18add
1 changed files with 5 additions and 0 deletions
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5
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -72,6 +72,11 @@ Value *SCEVExpander::InsertCastOfTo(Instruction::CastOps opcode, Value *V,
/// of work to avoid inserting an obviously redundant operation.
Value *SCEVExpander::InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
Value *RHS, Instruction *&InsertPt) {
// Fold a binop with constant operands.
if (Constant *CLHS = dyn_cast<Constant>(LHS))
if (Constant *CRHS = dyn_cast<Constant>(RHS))
return ConstantExpr::get(Opcode, CLHS, CRHS);
// Do a quick scan to see if we have this binop nearby. If so, reuse it.
unsigned ScanLimit = 6;
for (BasicBlock::iterator IP = InsertPt, E = InsertPt->getParent()->begin();