diff options
Diffstat (limited to 'gcc/emit-rtl.c')
| -rw-r--r-- | gcc/emit-rtl.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c index 6872afa..3032b53 100644 --- a/gcc/emit-rtl.c +++ b/gcc/emit-rtl.c @@ -1434,6 +1434,40 @@ component_ref_for_mem_expr (tree ref) TREE_OPERAND (ref, 1)); } +/* Returns 1 if both MEM_EXPR can be considered equal + and 0 otherwise. */ + +int +mem_expr_equal_p (tree expr1, tree expr2) +{ + if (expr1 == expr2) + return 1; + + if (! expr1 || ! expr2) + return 0; + + if (TREE_CODE (expr1) != TREE_CODE (expr2)) + return 0; + + if (TREE_CODE (expr1) == COMPONENT_REF) + return + mem_expr_equal_p (TREE_OPERAND (expr1, 0), + TREE_OPERAND (expr2, 0)) + && mem_expr_equal_p (TREE_OPERAND (expr1, 1), /* field decl */ + TREE_OPERAND (expr2, 1)); + + if (TREE_CODE (expr1) == INDIRECT_REF) + return mem_expr_equal_p (TREE_OPERAND (expr1, 0), + TREE_OPERAND (expr2, 0)); + + /* Decls with different pointers can't be equal. */ + if (DECL_P (expr1)) + return 0; + + abort(); /* ARRAY_REFs, ARRAY_RANGE_REFs and BIT_FIELD_REFs should already + have been resolved here. */ +} + /* Given REF, a MEM, and T, either the type of X or the expression corresponding to REF, set the memory attributes. OBJECTP is nonzero if we are making a new object of this type. BITPOS is nonzero if |