[LLVMbugs] [Bug 19717] New: Assertion failure when reordering shuffle and binary operation

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19717

            Bug ID: 19717
           Summary: Assertion failure when reordering shuffle and binary
                    operation
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: Hao.Liu at arm.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This bug is introduced by the commit
http://llvm.org/viewvc/llvm-project?rev=208488&view=rev
This patch tries to do the following transformation:
    Op(shuffle(v1, m), shuffle(v2, m)) -> shuffle(Op(v1, v2), m)

But when v1 and v2 are different types, to create Op(v1, v2) may trigger
assertions.
To reproduce with following test case simple.ll:
-------------------------------------------------------------------------------
define <2 x i32> @dotest(<4 x i32> %in0, <2 x i32> %in1) {
entry:
  %shuffle = shufflevector <4 x i32> %in0, <4 x i32> %in0, <2 x i32>
zeroinitializer
  %shuffle4 = shufflevector <2 x i32> %in1, <2 x i32> %in1, <2 x i32>
zeroinitializer
  %mul = mul <2 x i32> %shuffle, %shuffle4
  ret <2 x i32> %mul
}
-------------------------------------------------------------------------------
Run with: 
$opt -S -instcombine simple.ll

The error message is like:
opt: llvm/lib/IR/Instructions.cpp:1848: static llvm::BinaryOperator*
llvm::BinaryOperator::Create(llvm::Instruction::BinaryOps, llvm::Value*,
llvm::Value*, const llvm::Twine&, llvm::Instruction*): Assertion `S1->getType()
== S2->getType() && "Cannot create binary operator with two operands of
differing type!"' failed.

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