diff options
Diffstat (limited to 'gcc/tree-ssa-phiprop.c')
| -rw-r--r-- | gcc/tree-ssa-phiprop.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/tree-ssa-phiprop.c b/gcc/tree-ssa-phiprop.c index 80d2fc4..20fda6c 100644 --- a/gcc/tree-ssa-phiprop.c +++ b/gcc/tree-ssa-phiprop.c @@ -32,6 +32,7 @@ along with GCC; see the file COPYING3. If not see #include "gimplify.h" #include "gimple-iterator.h" #include "stor-layout.h" +#include "tree-ssa-loop.h" /* This pass propagates indirect loads through the PHI node for its address to make the load source possibly non-addressable and to @@ -230,6 +231,19 @@ phiprop_insert_phi (basic_block bb, gphi *phi, gimple *use_stmt, return res; } +/* Verify if *idx is available at *DATA. */ + +static bool +chk_uses (tree, tree *idx, void *data) +{ + basic_block dom = (basic_block) data; + if (TREE_CODE (*idx) == SSA_NAME) + return (SSA_NAME_IS_DEFAULT_DEF (*idx) + || ! dominated_by_p (CDI_DOMINATORS, + gimple_bb (SSA_NAME_DEF_STMT (*idx)), dom)); + return true; +} + /* Propagate between the phi node arguments of PHI in BB and phi result users. For now this matches # p_2 = PHI <&x, &y> @@ -342,6 +356,13 @@ propagate_with_phi (basic_block bb, gphi *phi, struct phiprop_d *phivn, insert aggregate copies on the edges instead. */ if (!is_gimple_reg_type (TREE_TYPE (TREE_TYPE (ptr)))) { + /* As we replicate the lhs on each incoming edge all + used SSA names have to be available there. */ + if (! for_each_index (gimple_assign_lhs_ptr (use_stmt), + chk_uses, + get_immediate_dominator (CDI_DOMINATORS, + gimple_bb (phi)))) + goto next; phiprop_insert_phi (bb, phi, use_stmt, phivn, n); /* Remove old stmt. The phi is taken care of by DCE. */ |