search for: _z14convert_char16dv16_s

...the upper half of the function argument (which is short16) is zero. This happens only when I compile code with pocl, but not when I use clang and/or llc manually. I tracked this down to the following. The call site looks like vmovdqa 24064(%rsp), %ymm0 vmovdqa %ymm0, (%rsp) vzeroupper callq __Z14convert_char16Dv16_s which passes the argument on the stack. The callee, however, begins with __Z14convert_char16Dv16_s: ## @_Z14convert_char16Dv16_s .cfi_startproc ## BB#0: ## %entry pushq %rbp Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp...