[llvm-bugs] [Bug 32545] New: Assertion `(!To[i].getNode() || N->getValueType(i) == To[i].getValueType()) && "Cannot combine value to value of different type!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32545

            Bug ID: 32545
           Summary: Assertion `(!To[i].getNode() || N->getValueType(i) ==
                    To[i].getValueType()) && "Cannot combine value to
                    value of different type!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: efriedma at codeaurora.org
                CC: llvm-bugs at lists.llvm.org, niravd at google.com

Testcase (input to llc):

target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7--linux-gnueabi"

define void @f(i32 %dstStride, i8* %indvars.iv, <2 x i8>* %zz) {
entry:
  br label %for.body

for.body:
  %tmp = load <2 x i8>, <2 x i8>* %zz, align 1
  %tmp1 = extractelement <2 x i8> %tmp, i32 0
  %.lhs.rhs = zext i8 %tmp1 to i32
  call void @g(i32 %.lhs.rhs)
  br label %for.body
}

declare void @g(i32)

Crashes like this:

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:919: llvm::SDValue (anonymous
namespace)::DAGCombiner::CombineTo(llvm::SDNode *, const llvm::SDValue *,
unsigned int, bool): Assertion `(!To[i].getNode() || N->getValueType(i) ==
To[i].getValueType()) && "Cannot combine value to value of different type!"'
failed.

This is a recent regression caused by r298920.

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