[LLVMbugs] [Bug 11555] OpenCL shift counts can overflow

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Mar 23 07:40:12 PDT 2013


Erik Schnetter <schnetter at gmail.com> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #4 from Erik Schnetter <schnetter at gmail.com> ---
You are correct -- if the arguments are scalars, integer promotion applies.

However, if the left argument of the shift operation is a vector, then integer
promotion does not apply (also OpenCL 6.3.j). This test case demonstrates the

typedef char char2  __attribute__((__ext_vector_type__(2)));

int main(int argc, char **argv)
  char2 x = (char2)1 << (char2)9;
  printf("[%d,%d]\n", x.s0, x.s1);
  return 0;

It should output [2,2], but does output [0,0].

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