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Try turning icmp(bitcast(x), bitcast(y)) into icmp(bitcast(bitcast(x)), y) in
the hopes that the two bitcasts will merge. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82371 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1627,6 +1627,16 @@ Constant *llvm::ConstantFoldCompareInstruction(LLVMContext &Context,
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if (Result != -1)
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return ConstantInt::get(Type::getInt1Ty(Context), Result);
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// If the right hand side is a bitcast, try using its inverse to simplify
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// it by moving it to the left hand side.
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if (ConstantExpr *CE2 = dyn_cast<ConstantExpr>(C2)) {
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if (CE2->getOpcode() == Instruction::BitCast) {
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Constant *CE2Op0 = CE2->getOperand(0);
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Constant *Inverse = ConstantExpr::getBitCast(C1, CE2Op0->getType());
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return ConstantExpr::getICmp(pred, Inverse, CE2Op0);
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}
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}
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if (!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) {
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// If C2 is a constant expr and C1 isn't, flip them around and fold the
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// other way if possible.
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@ -23,3 +23,8 @@ global i1 srem (i1 icmp ult (i8* @X, i8* @Y), i1 icmp ult (i8* @X, i8* @Z))
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global i1 urem (i1 icmp ult (i8* @X, i8* @Y), i1 icmp ult (i8* @X, i8* @Z))
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; CHECK-NOT: icmp
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; CHECK: i1 false
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global i1 icmp ule (i32* bitcast (i8* @X to i32*), i32* bitcast (i8* @Y to i32*))
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; CHECK-NOT: bitcast
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; CHECK: icmp
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