diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index cadf591970e..4e22f6ac812 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -67,6 +67,15 @@ const char *const built_in_names[(int) END_BUILTINS] = }; #undef DEF_BUILTIN +/* Setup an array of _DECL trees, make sure each element is + initialized to NULL_TREE. */ +#define DEF_BUILTIN(x) NULL_TREE, +tree built_in_decls[(int) END_BUILTINS] = +{ +#include "builtins.def" +}; +#undef DEF_BUILTIN + tree (*lang_type_promotes_to) PARAMS ((tree)); static int get_pointer_alignment PARAMS ((tree, unsigned)); @@ -102,6 +111,7 @@ static rtx expand_builtin_strlen PARAMS ((tree, rtx, static rtx expand_builtin_alloca PARAMS ((tree, rtx)); static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx)); static rtx expand_builtin_frame_address PARAMS ((tree)); +static rtx expand_builtin_fputs PARAMS ((tree, int)); static tree stabilize_va_list PARAMS ((tree, int)); static rtx expand_builtin_expect PARAMS ((tree, rtx)); static rtx bounded_ptr_dest PARAMS ((tree, rtx, rtx)); @@ -2432,6 +2442,56 @@ expand_builtin_ffs (arglist, target, subtarget) return target; } +/* If the string passed to fputs is a constant and is one character + long, we attempt to transform this call into __builtin_fputc(). */ +static rtx +expand_builtin_fputs (arglist, ignore) + tree arglist; + int ignore; +{ + tree call_expr, len, stripped_string, newarglist; + tree fn = built_in_decls[BUILT_IN_FPUTC]; + + /* If the return value is used, or the replacement _DECL isn't + initialized, don't do the transformation. */ + if (!ignore || !fn) + return 0; + + /* Verify the arguments in the original call. */ + if (arglist == 0 + || (TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE) + || TREE_CHAIN (arglist) == 0 + || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) + != POINTER_TYPE)) + return 0; + + /* Get the length of the string passed to fputs. */ + len = c_strlen (TREE_VALUE (arglist)); + + /* If the length != 1, punt. */ + if (len == 0 || compare_tree_int (len, 1)) + return 0; + + stripped_string = TREE_VALUE (arglist); + STRIP_NOPS (stripped_string); + if (stripped_string && TREE_CODE (stripped_string) == ADDR_EXPR) + stripped_string = TREE_OPERAND (stripped_string, 0); + + /* New argument list transforming fputs(string, stream) to + fputc(string[0], stream). */ + newarglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist))); + newarglist = + tree_cons (NULL_TREE, + build_int_2 (TREE_STRING_POINTER (stripped_string)[0], 0), + newarglist); + + call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn); + call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)), + call_expr, newarglist, NULL_TREE); + TREE_SIDE_EFFECTS (call_expr) = 1; + return expand_expr (call_expr, NULL_RTX, VOIDmode, 0); +} + /* Expand a call to __builtin_expect. We return our argument and emit a NOTE_INSN_EXPECTED_VALUE note. */ @@ -2505,7 +2565,8 @@ expand_builtin (exp, target, subtarget, mode, ignore) || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY - || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS)) + || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS + || fcode == BUILT_IN_FPUTC || fcode == BUILT_IN_FPUTS)) return expand_call (exp, target, ignore); switch (fcode) @@ -2728,6 +2789,15 @@ expand_builtin (exp, target, subtarget, mode, ignore) emit_barrier (); return const0_rtx; + case BUILT_IN_FPUTC: + break; + + case BUILT_IN_FPUTS: + target = expand_builtin_fputs (arglist, ignore); + if (target) + return target; + break; + /* Various hooks for the DWARF 2 __throw routine. */ case BUILT_IN_UNWIND_INIT: expand_builtin_unwind_init (); |