From 0f0eb18addc94bf3d8179fbce162c8c4622b9866 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Fri, 15 Jun 2007 19:21:55 +0000 Subject: [PATCH] Fold a binary operator with constant operands when expanding code for a SCEV. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37602 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/ScalarEvolutionExpander.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp index c8c683cb3f6..3e590d68f55 100644 --- a/lib/Analysis/ScalarEvolutionExpander.cpp +++ b/lib/Analysis/ScalarEvolutionExpander.cpp @@ -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(LHS)) + if (Constant *CRHS = dyn_cast(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();