[llvm-bugs] [Bug 45541] New: [AArch64] Incorrect result for vector conversion with -O2

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https://bugs.llvm.org/show_bug.cgi?id=45541

            Bug ID: 45541
           Summary: [AArch64] Incorrect result for vector conversion with
                    -O2
           Product: new-bugs
           Version: 10.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: clang at evan.coeusgroup.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 23358
  --> https://bugs.llvm.org/attachment.cgi?id=23358&action=edit
Test case

The attached test case works on without optimization and on GCC, but fails with
-O2 (`clang-10 -v -target aarch64-linux-gnu -O2 -o mm_cvtepu8_epi16
mm_cvtepu8_epi16.c` to be precise).

I've added a FOO preprocessor macro (see line 27) to switch between making
simde__m128i a typedef to int64x2_t and int32x4_t.  Depending on which is used
different functions fail.  It shouldn't actually matter since the code uses
__builtin_memcpy to convert to/from simde__m128i_private and simde__m128i.

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