[llvm-bugs] [Bug 43337] New: <altivec.h> is missing vec_sel(vector [un]signed long long, ...)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43337

            Bug ID: 43337
           Summary: <altivec.h> is missing vec_sel(vector [un]signed long
                    long, ...)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The following overloads of vec_sel are missing from <altivec.h>:

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);

Worse, the PPC wrapper <emmintrin.h> relies on one of these in the
implementation of _mm_sll_epi64.

We currently "get away with" this due to the broken default of
-flax-vector-conversions, but builds using <emmintrin.h> under Power8 fail with
-fno-lax-vector-conversions due to this (and other bugs in our intrinsics
headers).

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