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Diffstat (limited to 'gcc/target.def')
| -rw-r--r-- | gcc/target.def | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/target.def b/gcc/target.def index b6bcb86a995..a94175781aa 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -4533,6 +4533,24 @@ used for arguments without any special help.", (cumulative_args_t ca, machine_mode mode, const_tree type, bool named), default_function_arg_advance) +DEFHOOK +(function_arg_padding, + "This hook determines whether, and in which direction, to pad out\n\ +an argument of mode @var{mode} and type @var{type}. It returns\n\ +@code{PAD_UPWARD} to insert padding above the argument, @code{PAD_DOWNWARD}\n\ +to insert padding below the argument, or @code{PAD_NONE} to inhibit padding.\n\ +\n\ +The @emph{amount} of padding is not controlled by this hook, but by\n\ +@code{TARGET_FUNCTION_ARG_ROUND_BOUNDARY}. It is always just enough\n\ +to reach the next multiple of that boundary.\n\ +\n\ +This hook has a default definition that is right for most systems.\n\ +For little-endian machines, the default is to pad upward. For\n\ +big-endian machines, the default is to pad downward for an argument of\n\ +constant size shorter than an @code{int}, and upward otherwise.", + pad_direction, (machine_mode mode, const_tree type), + default_function_arg_padding) + /* Return zero if the argument described by the state of CA should be placed on a stack, or a hard register in which to store the argument. The values MODE, TYPE, and NAMED describe that |