[LLVMdev] TOT opt does not terminate!

[Chris Lattner]

On Sep 4, 2009, at 9:37 AM, Gaster, Benedict wrote:

> The following code causes opt to not terminate!

This works for me now, please file bugs when you hit problems.

-Chris


>
> With TOT this morning, and of a week ago:
>
> clang foo.c and clang –O1 foo.c
>
> work fine.
>
> clang –O2 foo.c and clang –O3 foo.c
>
> do not terminate. (At least after 10 minutes)
>
> If I generate the bit code (clang-cc –emit-llvmbc) and then run:
>
> opt –O3 foo.bc
>
> it does not terminate.
>
> //foo.c
> int get_id(int);
>
> typedef short short2 __attribute__ ((vector_size (2)));
>
> union _X {
>     short2 s;
>     int i;
> };
>
> typedef union _X X;
>
> inline short2 as_short2(int x)
> {
>     X result;
>
>     result.i = x;
>     return result.s;
> }
>
> inline int as_int(short2 x)
> {
>     X result;
>
>     result.s = x;
>     return result.i;
> }
>
> void short2_int_swap(
>   short2* b,
>   int* c)
> {
>     int gidx = get_id(0);
>     short2 bval = b[gidx];
>     int cval = c[gidx];
>
>     b[gidx] = as_short2(cval);
>     c[gidx] = as_int(bval);
> }
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