diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 184711b..e1ba858 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -6767,6 +6767,28 @@ fold_builtin_toascii (tree arglist) } } +/* Fold a call to builtin isdigit. */ + +static tree +fold_builtin_isdigit (tree arglist) +{ + if (! validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE)) + return 0; + else + { + /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */ + /* According to the C standard, isdigit is unaffected by locale. */ + tree arg = TREE_VALUE (arglist); + arg = build1 (NOP_EXPR, unsigned_type_node, arg); + arg = build (MINUS_EXPR, unsigned_type_node, arg, + fold (build1 (NOP_EXPR, unsigned_type_node, + build_int_2 (TARGET_DIGIT0, 0)))); + arg = build (LE_EXPR, integer_type_node, arg, + fold (build1 (NOP_EXPR, unsigned_type_node, + build_int_2 (9, 0)))); + return fold (arg); + } +} /* Used by constant folding to eliminate some builtin calls early. EXP is the CALL_EXPR of a call to a builtin function. */ @@ -7257,6 +7279,9 @@ fold_builtin (tree exp) case BUILT_IN_TOASCII: return fold_builtin_toascii (arglist); + case BUILT_IN_ISDIGIT: + return fold_builtin_isdigit (arglist); + default: break; } |