Hi all,
I tried compiling an opencl kernel with intptr_t datatype. However it gives
error by default using LLVM/Clang 3.2 for nvptx . To allow usage, I tried
following typedefs ( by looking at tests in llvm sources ).
typedef int intptr_t;
and
typedef __typeof( (int*) 0) intptr_t;
Both definitions compiles the code, however gives following warning.
warning: incompatible pointer to integer conversion assigning to 'int'
from
'int *'; dereference with *
Is it safe to use the above typedefs ? The generated code seems correct for
x86 machines (with llvm instruction ptrtoint). Or is there better way to
make sure that the semantics of intprt_t are preserved in clang/llvm for
all archs ?
The code I tried to compile is
__kernel void intptr_t_kernel(int *a, int *b)
{
intptr_t c = (intptr_t)a;
b = (int*) c;
*a += b;
}
and the code generated is
define ptx_kernel void @intptr_t_kernel(i32* %a, i32* nocapture %b)
nounwind noinline {
entry:
%0 = load i32* %a, align 4, !tbaa !1
%add.ptr = getelementptr inbounds i32* %a, i32 %0
%conv = ptrtoint i32* %add.ptr to i32
store i32 %conv, i32* %a, align 4, !tbaa !1
ret void
}
Thanks a lot for help.
Regards,
Ankur
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20130131/22a344de/attachment.html>
