Hi everyone,
I'm playing around on GCC version 11.3 (build Ubuntu), with plugins and
passes running on GCC IL, |GIMPLE| in its SSA form to be precise.
But I face an issue with |GIMPLE_COND| statement.
Here is my example statement (output from |debug_gimple_stmt()|):
|if (a_3 == x.0_1) |
Here is the basic bloc containing the statement (dump from
|gimple_debug_bb()|):
|;; basic block 2, loop depth 0 ;; pred: ENTRY a_3 = 5; # VUSE
<.MEM_4(D)> x.0_1 = x; if (a_3 == x.0_1) goto <bb 3>; [INV] else goto
<bb 4>; [INV] ;; succ: 3 ;; 4 |
So, things I'm having trouble with is that when I'm calling
|gimple_cond_{true,false}_label()| on the |GIMPLE_COND| statement
(casted through |as_a<gcond*>()|), I get a null pointer for both of
them, and I do not understand why.
My first intuition is that here |goto|s is not branching on any label
but on basic bloc directly somehow explain it.
I have been told to use extract_true_false_edges_from_block(), and it do
works.
Though this is not really what I was expecting as I get an edge and not
a tree nor a gimple *.
By the way, extract_true_false_edges_from_block() is not mention inside
the internal documentation, whereas gimple_cond_{true,false}_label() is.
Anyway, my question is regarding the gimple_cond_{true,false}_label()
function.
I can't find any use case where this function is not returning nullptr,
so what could be its typical use(s) case(s)?
Cheers,
Pierrick Philippe
