diff options
Diffstat (limited to 'gcc/tree-ssa-reassoc.c')
| -rw-r--r-- | gcc/tree-ssa-reassoc.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c index 03faec5e4b3..0710bae7de0 100644 --- a/gcc/tree-ssa-reassoc.c +++ b/gcc/tree-ssa-reassoc.c @@ -2134,11 +2134,33 @@ update_range_test (struct range_entry *range, struct range_entry *otherrange, in_p, low, high); enum warn_strict_overflow_code wc = WARN_STRICT_OVERFLOW_COMPARISON; gimple_stmt_iterator gsi; - unsigned int i; + unsigned int i, uid; if (tem == NULL_TREE) return false; + /* If op is default def SSA_NAME, there is no place to insert the + new comparison. Give up, unless we can use OP itself as the + range test. */ + if (op && SSA_NAME_IS_DEFAULT_DEF (op)) + { + if (op == range->exp + && ((TYPE_PRECISION (optype) == 1 && TYPE_UNSIGNED (optype)) + || TREE_CODE (optype) == BOOLEAN_TYPE) + && (op == tem + || (TREE_CODE (tem) == EQ_EXPR + && TREE_OPERAND (tem, 0) == op + && integer_onep (TREE_OPERAND (tem, 1)))) + && opcode != BIT_IOR_EXPR + && (opcode != ERROR_MARK || oe->rank != BIT_IOR_EXPR)) + { + stmt = NULL; + tem = op; + } + else + return false; + } + if (strict_overflow_p && issue_strict_overflow_warning (wc)) warning_at (loc, OPT_Wstrict_overflow, "assuming signed overflow does not occur " @@ -2176,12 +2198,22 @@ update_range_test (struct range_entry *range, struct range_entry *otherrange, tem = invert_truthvalue_loc (loc, tem); tem = fold_convert_loc (loc, optype, tem); - gsi = gsi_for_stmt (stmt); - unsigned int uid = gimple_uid (stmt); + if (stmt) + { + gsi = gsi_for_stmt (stmt); + uid = gimple_uid (stmt); + } + else + { + gsi = gsi_none (); + uid = 0; + } + if (stmt == NULL) + gcc_checking_assert (tem == op); /* In rare cases range->exp can be equal to lhs of stmt. In that case we have to insert after the stmt rather then before it. If stmt is a PHI, insert it at the start of the basic block. */ - if (op != range->exp) + else if (op != range->exp) { gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT); tem = force_gimple_operand_gsi (&gsi, tem, true, NULL_TREE, true, |