diff options
Diffstat (limited to 'gcc/tree-vect-stmts.c')
| -rw-r--r-- | gcc/tree-vect-stmts.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c index 7f52282..3cda888 100644 --- a/gcc/tree-vect-stmts.c +++ b/gcc/tree-vect-stmts.c @@ -475,6 +475,22 @@ process_use (stmt_vec_info stmt_vinfo, tree use, loop_vec_info loop_vinfo, basic_block def_bb = gimple_bb (dstmt_vinfo->stmt); basic_block bb = gimple_bb (stmt_vinfo->stmt); + /* case 2: A reduction phi (STMT) defined by a reduction stmt (DSTMT_VINFO). + We have to force the stmt live since the epilogue loop needs it to + continue computing the reduction. */ + if (gimple_code (stmt_vinfo->stmt) == GIMPLE_PHI + && STMT_VINFO_DEF_TYPE (stmt_vinfo) == vect_reduction_def + && gimple_code (dstmt_vinfo->stmt) != GIMPLE_PHI + && STMT_VINFO_DEF_TYPE (dstmt_vinfo) == vect_reduction_def + && bb->loop_father == def_bb->loop_father) + { + if (dump_enabled_p ()) + dump_printf_loc (MSG_NOTE, vect_location, + "reduc-stmt defining reduc-phi in the same nest.\n"); + vect_mark_relevant (worklist, dstmt_vinfo, relevant, true); + return opt_result::success (); + } + /* case 3a: outer-loop stmt defining an inner-loop stmt: outer-loop-header-bb: d = dstmt_vinfo |