Merge lp://staging/~schnetter/pocl/main into lp://staging/~pocl/pocl/trunk

'make check' fails (11: Kernel functions abs bitselect clz max min popcount FAILED (testsuite.at:175) due to a warning:
pocl643LiL//program.cl:126:461386: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] ...
oid test_bitselect_char() { typedef char gtype; typedef char sgtype; typedef uchar ugtype; typedef uchar sugtype; char const *const typename = "char"; ({ typedef int aisgtype[(!((sgtype)0.1 > ...

This compiler warning is there since the code is type-generic and works for both signed and unsigned types. abs() is indeed a superfluous operation for unsigned types. Since OpenCL does not have templates, we need to use if statements instead.

The code now checks the sign bit explicitly instead of comparing to zero. This silences the warning (until the optimizer catches up). The real solution would be to switch off this warning for this code.