[llvm-bugs] [Bug 46770] New: [ppc] vec_sel variants missing

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46770

            Bug ID: 46770
           Summary: [ppc] vec_sel variants missing
           Product: new-bugs
           Version: trunk
          Hardware: Other
                OS: All
            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

According to the xlc documentation
(<https://www.ibm.com/support/knowledgecenter/SSXVZZ_16.1.1/com.ibm.compilers.linux.doc/compiler.pdf?view=kc>,
page 501), the following variants of vec_sel should be available:

vector bool long long
  vec_sel(vector bool long long
          vector bool long long,
          vector bool long long);

  vector bool long long
  vec_sel(vector bool long long
          vector bool long long,
          vector unsigned long long);

  vector signed long long
  vec_sel(vector signed long long
          vector signed long long,
          vector bool long long);

  vector signed long long
  vec_sel(vector signed long long
          vector signed long long,
          vector unsigned long long);

  vector unsigned long long
  vec_sel(vector unsigned long long
          vector unsigned long long,
          vector bool long long);

  vector unsigned long long
  vec_sel(vector unsigned long long
          vector unsigned long long,
          vector unsigned long long);

However, in clang the only variants declared in altivec.h for 64-bit types have
vector double for the first two arguments and the return value.

Reproducing is pretty straightforward, just enable -Wvector-conversion and try
to call one of the functions.  For example:

  #include <altivec.h>

  vector signed long long
  foo(vector signed long long a,
      vector signed long long b,
      vector unsigned long long c) {
    return vec_sel(a, b, c);
  }


Here it is on Compiler Explorer: https://godbolt.org/z/x71Gnj

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