return -1;
}
+/* Helper to build a call to memcmp. */
+
+static tree
+build_memcmp_call (tree s1, tree s2, tree n)
+{
+ tree tmp;
+
+ if (!POINTER_TYPE_P (TREE_TYPE (s1)))
+ s1 = gfc_build_addr_expr (pvoid_type_node, s1);
+ else
+ s1 = fold_convert (pvoid_type_node, s1);
+
+ if (!POINTER_TYPE_P (TREE_TYPE (s2)))
+ s2 = gfc_build_addr_expr (pvoid_type_node, s2);
+ else
+ s2 = fold_convert (pvoid_type_node, s2);
+
+ n = fold_convert (size_type_node, n);
+
+ tmp = build_call_expr_loc (input_location,
+ builtin_decl_explicit (BUILT_IN_MEMCMP),
+ 3, s1, s2, n);
+
+ return fold_convert (integer_type_node, tmp);
+}
+
/* Compare two strings. If they are all single characters, the result is the
subtraction of them. Otherwise, we build a library call. */
return integer_one_node;
}
+ /* We can compare via memcpy if the strings are known to be equal
+ in length and they are
+ - kind=1
+ - kind=4 and the comparision is for (in)equality. */
+
+ if (INTEGER_CST_P (len1) && INTEGER_CST_P (len2)
+ && tree_int_cst_equal (len1, len2)
+ && (kind == 1 || code == EQ_EXPR || code == NE_EXPR))
+ {
+ tree tmp;
+ tree chartype;
+
+ chartype = gfc_get_char_type (kind);
+ tmp = fold_build2_loc (input_location, MULT_EXPR, TREE_TYPE(len1),
+ fold_convert (TREE_TYPE(len1),
+ TYPE_SIZE_UNIT(chartype)),
+ len1);
+ return build_memcmp_call (str1, str2, tmp);
+ }
+
/* Build a call for the comparison. */
if (kind == 1)
fndecl = gfor_fndecl_compare_string;
--- /dev/null
+! { dg-do run }
+! { dg-options "-fdump-tree-original" }
+program main
+ character (len=2) :: a, b
+ character (kind=4,len=4) :: c,d
+ a = 'ab'
+ b = 'aa'
+ if (a < b) call abort
+ c = 4_"aaaa"
+ d = 4_"aaab"
+ if (c == d) call abort
+ if (c > d) call abort
+end program main
+! { dg-final { scan-tree-dump-times "_gfortran_compare_string_char4" 1 "original" } }
+! { dg-final { scan-tree-dump-times "__builtin_memcmp" 2 "original" } }
+! { dg-final { cleanup-tree-dump "original" } }