[llvm-bugs] [Bug 46527] New: Code generation error with -m32 -fPIC

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46527

            Bug ID: 46527
           Summary: Code generation error with -m32 -fPIC
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jjorge at quarkslab.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 23663
  --> https://bugs.llvm.org/attachment.cgi?id=23663&action=edit
Reduced test case.

Compiling the attached IR code with the command `clang -m32 -fPIC -c
test-small.ll` produces the following error:

    llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:4524: virtual void (anonymous
namespace)::X86DAGToDAGISel::Select(llvm::SDNode *): Assertion
`Subtarget->hasSSE41() && "Expected SSE4.1 support!"' failed.

See attached file clang-10-output.log for the full message.

Clang is built from the release/10.x branch.

In my experiments I observed the following:
    - the same error occurs with Clang from the release/9.x branch, see the
attached file clang-9-output.log for the output.
    - omitting either -fPIC or -m32 prevents the errors.
    - there is no error with Clang 10 as provided by Ubuntu 20.04 unless I add
-msse2 or -msse3. See the attached file clang-10-ubuntu-output.log for the full
message. In this case the error is:

    error in backend: Cannot select: 0x13cb528: v16i8 = X86ISD::BLENDV
0x13cb250, 0x13c43f0, 0x13cb0b

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