diff options
Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 03772177d0d..8484c1d3602 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -2966,22 +2966,19 @@ Define this macro if successive arguments to a function occupy decreasing addresses on the stack. @end defmac -@defmac STARTING_FRAME_OFFSET -Offset from the frame pointer to the first local variable slot to be allocated. - -If @code{FRAME_GROWS_DOWNWARD}, find the next slot's offset by -subtracting the first slot's length from @code{STARTING_FRAME_OFFSET}. -Otherwise, it is found by adding the length of the first slot to the -value @code{STARTING_FRAME_OFFSET}. -@c i'm not sure if the above is still correct.. had to change it to get -@c rid of an overfull. --mew 2feb93 -@end defmac +@deftypefn {Target Hook} HOST_WIDE_INT TARGET_STARTING_FRAME_OFFSET (void) +This hook returns the offset from the frame pointer to the first local +variable slot to be allocated. If @code{FRAME_GROWS_DOWNWARD}, it is the +offset to @emph{end} of the first slot allocated, otherwise it is the +offset to @emph{beginning} of the first slot allocated. The default +implementation returns 0. +@end deftypefn @defmac STACK_ALIGNMENT_NEEDED Define to zero to disable final alignment of the stack during reload. The nonzero default for this macro is suitable for most ports. -On ports where @code{STARTING_FRAME_OFFSET} is nonzero or where there +On ports where @code{TARGET_STARTING_FRAME_OFFSET} is nonzero or where there is a register save block following the local block that doesn't require alignment to @code{STACK_BOUNDARY}, it may be beneficial to disable stack alignment and do it in the backend. |