[llvm-bugs] [Bug 28707] New: inconsistent behavior in compiling vector extension code with vector assignment

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28707

            Bug ID: 28707
           Summary: inconsistent behavior in compiling vector extension
                    code with vector assignment
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following two test cases illustrate an inconsistency how clang processes
vector extension code.  All versions since at least as early as 2.9 are
impacted. 


$ clang -v
clang version 4.0.0 (trunk 276574)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang test1.c 
test1.c:5:8: error: assigning to '__attribute__((__vector_size__(2 *
sizeof(double)))) double' (vector of 2 'double' values) from incompatible type
      '__attribute__((__vector_size__(2 * sizeof(int)))) int' (vector of 2
'int' values)
  avec = bvec; 
       ^ ~~~~
1 error generated.
$ 
$ clang test2.c
$ 
$ cat test1.c
int main ()
{
  __attribute__ ((vector_size ((2) * sizeof (double)))) double avec; 
  __attribute__ ((vector_size ((2) * sizeof (int)))) int bvec = { 1, 2 }; 
  avec = bvec; 
  return 0;
}
$ 
$ cat test2.c
int main ()
{
  __attribute__ ((vector_size ((2) * sizeof (float)))) float avec; 
  __attribute__ ((vector_size ((2) * sizeof (int)))) int bvec = { 1, 2 }; 
  avec = bvec; 
  return 0;
}
$

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