diff options
Diffstat (limited to 'gcc/tm.texi')
| -rw-r--r-- | gcc/tm.texi | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/gcc/tm.texi b/gcc/tm.texi index e3dd5309b20..1956979f1bd 100644 --- a/gcc/tm.texi +++ b/gcc/tm.texi @@ -1697,17 +1697,6 @@ definition of this macro is / UNITS_PER_WORD) @end smallexample -@findex ALTER_HARD_SUBREG -@item ALTER_HARD_SUBREG (@var{tgt_mode}, @var{word}, @var{src_mode}, @var{regno}) -A C expression that returns an adjusted hard register number for - -@smallexample -(subreg:@var{tgt_mode} (reg:@var{src_mode} @var{regno}) @var{word}) -@end smallexample - -This may be needed if the target machine has mixed sized big-endian -registers, like Sparc v9. - @findex HARD_REGNO_MODE_OK @item HARD_REGNO_MODE_OK (@var{regno}, @var{mode}) A C expression that is nonzero if it is permissible to store a value @@ -1790,6 +1779,19 @@ allocation. Define this macro if the compiler should avoid copies to/from @code{CCmode} registers. You should only define this macro if support for copying to/from @code{CCmode} is incomplete. + +@findex SUBREG_REGNO_OFFSET +@item SUBREG_REGNO_OFFSET +Define this macro if the compiler needs to handle subregs in a non-standard +way. The macro returns the correct regno offset for mode @code{YMODE} given +a subreg of type @code{XMODE}. +This macro takes 4 parameters: +@code{XREGNO} - A regno of an inner hard subreg_reg (or what will become one). +@code{XMODE} - The mode of xregno. +@code{OFFSET} - The byte offset. +@code{YMODE} - The mode of a top level SUBREG (or what may become one). +The default function can be found in rtlanal.c, function +@code{subreg_regno_offset}. Normally this does not need to be defined. @end table @node Leaf Functions |
