[llvm-bugs] [Bug 40748] New: Can't call multiversioned function from other multiversioned function

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40748

            Bug ID: 40748
           Summary: Can't call multiversioned function from other
                    multiversioned function
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: steinar+llvm at gunderson.no
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Hi,

GCC accepts this code, Clang (including version 8) doesn't:

__attribute__((target("sse2"))) int inner();
__attribute__((target("avx2"))) int inner();

__attribute__((target("sse2"))) int outer();

__attribute__((target("sse2")))
int outer()
{
        return inner();
}

test.cc:9:9: error: no matching function for call to 'inner'
        return inner();
               ^~~~~
1 error generated.

I don't see how this is supposed to work; the only way I can get it to compile
with Clang is to remove the avx2 version, but that sort of removes the point of
multiversioning.

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