diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/builtins.c | 14 |
2 files changed, 14 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index bf11841..72d5d0a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2003-04-14 Roger Sayle <roger@eyesopen.com> + * builtins.c (expand_builtin_strlen): Evaluate the lengths of + string literals at compile-time. + +2003-04-14 Roger Sayle <roger@eyesopen.com> + * fold-const.c (fold): Transform (c1 - x) cmp c2, where cmp is a comparison operation and c1/c2 are floating point constants into x swap(cmp) (c1 - c2). diff --git a/gcc/builtins.c b/gcc/builtins.c index 1519593..89f9531 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -1935,14 +1935,18 @@ expand_builtin_strlen (exp, target) else { rtx pat; - tree src = TREE_VALUE (arglist); - - int align - = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; - + tree len, src = TREE_VALUE (arglist); rtx result, src_reg, char_rtx, before_strlen; enum machine_mode insn_mode = value_mode, char_mode; enum insn_code icode = CODE_FOR_nothing; + int align; + + /* If the length can be computed at compile-time, return it. */ + len = c_strlen (src); + if (len) + return expand_expr (len, target, value_mode, EXPAND_NORMAL); + + align = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; /* If SRC is not a pointer type, don't do this operation inline. */ if (align == 0) |