[llvm-bugs] [Bug 47423] New: [PowerPC] Overloads of vec_cmpne in altivec.h incorrectly guarded for Power9

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47423

            Bug ID: 47423
           Summary: [PowerPC] Overloads of vec_cmpne in altivec.h
                    incorrectly guarded for Power9
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nemanja.i.ibm at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

According to Appendix A of the ELFv2 ABI specification, the availability of the
vec_cmpne overloads is not predicated on ISA 3.0. However, the implementation
in Clang is.

To reproduce:
#include <altivec.h>
vector bool int test(vector signed int a, vector signed int b) {
  return vec_cmpne(a, b);
}

Compile:
$ clang -O3 b.c -S -o - -mcpu=power8
b.c:3:10: warning: implicit declaration of function 'vec_cmpne' is invalid in
C99 [-Wimplicit-function-declaration]
  return vec_cmpne(a, b);
         ^
b.c:3:10: error: returning 'int' from a function with incompatible result type
'__vector __bool unsigned int' (vector of 4 'unsigned int' values)
  return vec_cmpne(a, b);
         ^~~~~~~~~~~~~~~
1 warning and 1 error generated.

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