diff options
Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 38 |
1 files changed, 2 insertions, 36 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index b2c7e14..4ce29ae 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -37,6 +37,8 @@ along with GCC; see the file COPYING3. If not see #include "tree-ssa-threadupdate.h" #include "langhooks.h" #include "params.h" +#include "tree-ssa-threadedge.h" +#include "tree-ssa-dom.h" /* This file implements optimizations on the dominator tree. */ @@ -2588,42 +2590,6 @@ avail_expr_hash (const void *p) /* PHI-ONLY copy and constant propagation. This pass is meant to clean up degenerate PHIs created by or exposed by jump threading. */ -/* Given PHI, return its RHS if the PHI is a degenerate, otherwise return - NULL. */ - -tree -degenerate_phi_result (gimple phi) -{ - tree lhs = gimple_phi_result (phi); - tree val = NULL; - size_t i; - - /* Ignoring arguments which are the same as LHS, if all the remaining - arguments are the same, then the PHI is a degenerate and has the - value of that common argument. */ - for (i = 0; i < gimple_phi_num_args (phi); i++) - { - tree arg = gimple_phi_arg_def (phi, i); - - if (arg == lhs) - continue; - else if (!arg) - break; - else if (!val) - val = arg; - else if (arg == val) - continue; - /* We bring in some of operand_equal_p not only to speed things - up, but also to avoid crashing when dereferencing the type of - a released SSA name. */ - else if (TREE_CODE (val) != TREE_CODE (arg) - || TREE_CODE (val) == SSA_NAME - || !operand_equal_p (arg, val, 0)) - break; - } - return (i == gimple_phi_num_args (phi) ? val : NULL); -} - /* Given a statement STMT, which is either a PHI node or an assignment, remove it from the IL. */ |