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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-02-18 21:13:37 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-02-18 21:13:37 -0500 |
| commit | d669f5da3c4c5c74f5a55d3c81c795b44aa877aa (patch) | |
| tree | c3344d850ee8b20ad47a857c62869d03ca10adbf | |
| parent | dc086e21e4bba1d558f0c9b0abb7800c762f8401 (diff) | |
| download | gcc-d669f5da3c4c5c74f5a55d3c81c795b44aa877aa.zip gcc-d669f5da3c4c5c74f5a55d3c81c795b44aa877aa.tar.gz gcc-d669f5da3c4c5c74f5a55d3c81c795b44aa877aa.tar.bz2 | |
(yylex...
(yylex, case '0'..'9','.'): For cases '0' and '1', check for single
digit constant before resorting to general number processing.
From-SVN: r11297
| -rw-r--r-- | gcc/c-lex.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gcc/c-lex.c b/gcc/c-lex.c index 26f3911..89ff60b 100644 --- a/gcc/c-lex.c +++ b/gcc/c-lex.c @@ -1118,7 +1118,23 @@ yylex () break; - case '0': case '1': case '2': case '3': case '4': + case '0': case '1': + { + int next_c; + /* Check first for common special case: single-digit 0 or 1. */ + + next_c = getc (finput); + ungetc (next_c, finput); /* Always undo this lookahead. */ + if (!isalnum (next_c) && next_c != '.') + { + token_buffer[0] = (char)c, token_buffer[1] = '\0'; + yylval.ttype = (c == '0') ? integer_zero_node : integer_one_node; + value = CONSTANT; + break; + } + /*FALLTHRU*/ + } + case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case '.': { |