[llvm-bugs] [Bug 41624] New: [InstSimplify] assertion in SimplifyGEPInst

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41624

            Bug ID: 41624
           Summary: [InstSimplify] assertion in SimplifyGEPInst
           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: llvm-dev at redking.me.uk
                CC: davide at freebsd.org, dblaikie at gmail.com,
                    llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com

Reduced from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12846

; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "llvm/test/Transforms/InstCombine/vector_gep1.ll"
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define void @test7(<2 x { i32, i32 }*> %a) {
  %A = alloca i16
  %w = getelementptr { i32, i32 }, <2 x { i32, i32 }*> %a, <2 x i32> <i32 5,
i32 9>, <2 x i32> zeroinitializer
  %E = extractelement <2 x i32*> %w, i1 false
  store i32* %E, i32** undef
  ret void
}

opt -instcombine
opt: /home/simon/LLVM/llvm/lib/IR/Type.cpp:630: static llvm::PointerType*
llvm::PointerType::get(llvm::Type*, unsigned int): Assertion `EltTy && "Can't
get a pointer to <null> type!"' failed.

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