Re: Generating a phi node

[Sebastian Pop]

On 6/13/07, Revital1 Eres <[EMAIL PROTECTED]> wrote:

Hello,

I have two ssa vars (i0 and i1 in the following example); what is the
sequence to generate a new phi node corresponding to i3 -

if (...)
     i0 = exp1

else
     i1 = exp2

i3 = PHI(i0 , i1);

From tree-vectorizer.c,

     /* 1.1. Generate new phi node in NEW_MERGE_BB:  */
     new_phi = create_phi_node (SSA_NAME_VAR (PHI_RESULT (orig_phi)),
                                new_merge_bb);

     /* 1.2. NEW_MERGE_BB has two incoming edges: GUARD_EDGE and the exit-edge
           of LOOP. Set the two phi args in NEW_PHI for these edges:  */
     loop_arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, EDGE_SUCC (loop->latch, 0));
     guard_arg = PHI_ARG_DEF_FROM_EDGE (orig_phi, loop_preheader_edge (loop));

     add_phi_arg (new_phi, loop_arg, new_exit_e);
     add_phi_arg (new_phi, guard_arg, guard_edge);