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tree-optimization/106228 - fix vect_setup_realignment virtual SSA handling

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The following adds missing assignment of a virtual use operand to a
created load to vect_setup_realignment which shows as bootstrap
failure on powerpc64-linux and extra testsuite fails for targets
when misaligned loads are not supported or not optimal.

	PR tree-optimization/106228
	* tree-vect-data-refs.cc (vect_setup_realignment): Properly
	set a VUSE operand on the emitted load.
This commit is contained in:
Richard Biener 2022-07-11 09:23:50 +02:00
parent 0a7e721a64
commit 79f18ac6b7
1 changed files with 8 additions and 0 deletions
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8
gcc/tree-vect-data-refs.cc
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@ -5780,6 +5780,13 @@ vect_setup_realignment (vec_info *vinfo, stmt_vec_info stmt_info,
if (loop_for_initial_load)
pe = loop_preheader_edge (loop_for_initial_load);
tree vuse;
gphi *vphi = get_virtual_phi (loop_for_initial_load->header);
if (vphi)
vuse = PHI_ARG_DEF_FROM_EDGE (vphi, pe);
else
vuse = gimple_vuse (gsi_stmt (*gsi));
/* 3. For the case of the optimized realignment, create the first vector
load at the loop preheader. */
@ -5813,6 +5820,7 @@ vect_setup_realignment (vec_info *vinfo, stmt_vec_info stmt_info,
new_stmt = gimple_build_assign (vec_dest, data_ref);
new_temp = make_ssa_name (vec_dest, new_stmt);
gimple_assign_set_lhs (new_stmt, new_temp);
gimple_set_vuse (new_stmt, vuse);
if (pe)
{
new_bb = gsi_insert_on_edge_immediate (pe, new_stmt);