Where is the definition of x_n(D) in GIMPLE?










0















I generated GIMPLE code from C code with GCC's -fdump-tree-optimized, and found that there exists a SSA variable which does not have its definition:



f (int cond)

 int _1;

 <bb 2> [100.00%]:
 if (cond_2(D) != 0)
 goto <bb 4>; [46.00%]
 else
 goto <bb 3>; [54.00%]

 <bb 3> [54.00%]:

 <bb 4> [100.00%]:
 # _1 = PHI <10(2), 20(3)>
 return _1;




Is definition of cond_2(D) hidden?
Is there any internal data structure in GCC which maintains the definition of cond_2(D)?



The input C program is as follows:



int f(int cond) 
 if (cond) 
 return 10;
 else 
 return 20;






gcc gimple







share|improve this question


























    0















    I generated GIMPLE code from C code with GCC's -fdump-tree-optimized, and found that there exists a SSA variable which does not have its definition:



    f (int cond)

     int _1;

     <bb 2> [100.00%]:
     if (cond_2(D) != 0)
     goto <bb 4>; [46.00%]
     else
     goto <bb 3>; [54.00%]

     <bb 3> [54.00%]:

     <bb 4> [100.00%]:
     # _1 = PHI <10(2), 20(3)>
     return _1;




    Is definition of cond_2(D) hidden?
    Is there any internal data structure in GCC which maintains the definition of cond_2(D)?



    The input C program is as follows:



    int f(int cond) 
     if (cond) 
     return 10;
     else 
     return 20;






    gcc gimple







    share|improve this question
























      0












      0








      0








      I generated GIMPLE code from C code with GCC's -fdump-tree-optimized, and found that there exists a SSA variable which does not have its definition:



      f (int cond)

       int _1;

       <bb 2> [100.00%]:
       if (cond_2(D) != 0)
       goto <bb 4>; [46.00%]
       else
       goto <bb 3>; [54.00%]

       <bb 3> [54.00%]:

       <bb 4> [100.00%]:
       # _1 = PHI <10(2), 20(3)>
       return _1;




      Is definition of cond_2(D) hidden?
      Is there any internal data structure in GCC which maintains the definition of cond_2(D)?



      The input C program is as follows:



      int f(int cond) 
       if (cond) 
       return 10;
       else 
       return 20;






      gcc gimple







      share|improve this question














      I generated GIMPLE code from C code with GCC's -fdump-tree-optimized, and found that there exists a SSA variable which does not have its definition:



      f (int cond)

       int _1;

       <bb 2> [100.00%]:
       if (cond_2(D) != 0)
       goto <bb 4>; [46.00%]
       else
       goto <bb 3>; [54.00%]

       <bb 3> [54.00%]:

       <bb 4> [100.00%]:
       # _1 = PHI <10(2), 20(3)>
       return _1;




      Is definition of cond_2(D) hidden?
      Is there any internal data structure in GCC which maintains the definition of cond_2(D)?



      The input C program is as follows:



      int f(int cond) 
       if (cond) 
       return 10;
       else 
       return 20;






      gcc gimple




      gcc gimple






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 15 '18 at 17:23









      aqjuneaqjune

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