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| author | Roger Sayle <roger@eyesopen.com> | 2003-04-14 20:23:27 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2003-04-14 20:23:27 +0000 |
| commit | 712b7a052fc05a2373ed40c1fd13b3cfb0e7df62 (patch) | |
| tree | affbca36245c345c26aa8393d0f487eadfbc22c9 /gcc/builtins.c | |
| parent | 15d4fd986330e2e993d0aef0f58d0c5bf7ab0e28 (diff) | |
| download | gcc-712b7a052fc05a2373ed40c1fd13b3cfb0e7df62.zip gcc-712b7a052fc05a2373ed40c1fd13b3cfb0e7df62.tar.gz gcc-712b7a052fc05a2373ed40c1fd13b3cfb0e7df62.tar.bz2 | |
builtins.c (expand_builtin_strlen): Evaluate the lengths of string literals at compile-time.
* builtins.c (expand_builtin_strlen): Evaluate the lengths of
string literals at compile-time.
From-SVN: r65585
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 14 |
1 files changed, 9 insertions, 5 deletions
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) |