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Re: Generating a phi node
On 6/13/07, Revital1 Eres <ERES@il.ibm.com> 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);