diff options
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index 8fbb1dd..64f1e8c 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -4824,6 +4824,40 @@ visit_nary_op (tree lhs, gassign *stmt) } } break; + case RDIV_EXPR: + case TRUNC_DIV_EXPR: + case MULT_EXPR: + /* Match up ([-]a){/,*}([-])b with v=a{/,*}b, replacing it with -v. */ + if (! HONOR_SIGN_DEPENDENT_ROUNDING (type)) + { + tree rhs[2]; + rhs[0] = rhs1; + rhs[1] = gimple_assign_rhs2 (stmt); + for (unsigned i = 0; i <= 1; ++i) + { + unsigned j = i == 0 ? 1 : 0; + tree ops[2]; + gimple_match_op match_op (gimple_match_cond::UNCOND, + NEGATE_EXPR, type, rhs[i]); + ops[i] = vn_nary_build_or_lookup_1 (&match_op, false); + ops[j] = rhs[j]; + if (ops[i] + && (ops[0] = vn_nary_op_lookup_pieces (2, code, + type, ops, NULL))) + { + gimple_match_op match_op (gimple_match_cond::UNCOND, + NEGATE_EXPR, type, ops[0]); + result = vn_nary_build_or_lookup (&match_op); + if (result) + { + bool changed = set_ssa_val_to (lhs, result); + vn_nary_op_insert_stmt (stmt, result); + return changed; + } + } + } + } + break; default: break; } @@ -5739,6 +5773,7 @@ eliminate_dom_walker::eliminate_insert (basic_block bb, if (!stmt || (!CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (stmt)) && gimple_assign_rhs_code (stmt) != VIEW_CONVERT_EXPR + && gimple_assign_rhs_code (stmt) != NEGATE_EXPR && gimple_assign_rhs_code (stmt) != BIT_FIELD_REF && (gimple_assign_rhs_code (stmt) != BIT_AND_EXPR || TREE_CODE (gimple_assign_rhs2 (stmt)) != INTEGER_CST))) |