[LLVMdev] TOT opt does not terminate!

[Gaster, Benedict]

The following code causes opt to not terminate!

 

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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