From 3d27f71f2d30d2580daa36732fc23228ffa6e98e Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Thu, 16 Feb 2012 15:03:04 +0000 Subject: InstSimplify: Strip pointer casts early. llvm-svn: 150694 --- llvm/lib/Analysis/InstructionSimplify.cpp | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'llvm/lib/Analysis/InstructionSimplify.cpp') diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp index 9d5b74c8cf2..c9ab52c99d1 100644 --- a/llvm/lib/Analysis/InstructionSimplify.cpp +++ b/llvm/lib/Analysis/InstructionSimplify.cpp @@ -1542,6 +1542,10 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS, Type *ITy = GetCompareTy(LHS); // The return type. Type *OpTy = LHS->getType(); // The operand type. + // Remove pointer casts that don't change the value. + LHS = LHS->stripPointerCasts(); + RHS = RHS->stripPointerCasts(); + // icmp X, X -> true/false // X icmp undef -> true/false. For example, icmp ugt %X, undef -> false // because X could be 0. @@ -1591,11 +1595,8 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS, // to the case where LHS is a global variable address or null is pointless, // since if both LHS and RHS are constants then we already constant folded // the compare, and if only one of them is then we moved it to RHS already. - Value *LHSPtr = LHS->stripPointerCasts(); - Value *RHSPtr = RHS->stripPointerCasts(); - if (isa(LHSPtr) && (isa(RHSPtr) || - isa(RHSPtr) || - isa(RHSPtr))) + if (isa(LHS) && (isa(RHS) || isa(RHS) || + isa(RHS))) // We already know that LHS != RHS. return ConstantInt::get(ITy, CmpInst::isFalseWhenEqual(Pred)); -- cgit v1.2.3