https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70956
vries at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
--- Comment #1 from vries at gcc dot gnu.org ---
Consider graphite_find_cross_bb_scalar_vars:
...
static void
graphite_find_cross_bb_scalar_vars (scop_p scop, gimple *stmt,
vec<scalar_use> *reads, vec<tree> *writes)
{
tree def;
if (gimple_code (stmt) == GIMPLE_ASSIGN)
def = gimple_assign_lhs (stmt);
else if (gimple_code (stmt) == GIMPLE_CALL)
def = gimple_call_lhs (stmt);
else if (gimple_code (stmt) == GIMPLE_PHI)
def = gimple_phi_result (stmt);
else
return;
build_cross_bb_scalars_def (scop, def, gimple_bb (stmt), writes);
...
...
We arrive at graphite_find_cross_bb_scalar_vars with:
...
(gdb) call debug_gimple_stmt (stmt)
# VUSE <.MEM_10(D)>
f2 (_1);
...
The call is resultless, so def becomes NULL_TREE.
This tentative patch handles NULL_TREE def in build_cross_bb_scalars_def, and
fixes the assert:
...
diff --git a/gcc/graphite-scop-detection.c b/gcc/graphite-scop-detection.c
index 7615842..dd50a1e 100644
--- a/gcc/graphite-scop-detection.c
+++ b/gcc/graphite-scop-detection.c
@@ -1722,8 +1722,7 @@ static void
build_cross_bb_scalars_def (scop_p scop, tree def, basic_block def_bb,
vec<tree> *writes)
{
- gcc_assert (def);
- if (!is_gimple_reg (def))
+ if (!def || !is_gimple_reg (def))
return;
/* Do not gather scalar variables that can be analyzed by SCEV as they can
be
...
