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| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/doc/tm.texi | 11 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 95ac3d7..78fd63c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2004-03-05 Kazu Hirata <kazu@cs.umass.edu> + + * doc/tm.texi (HARD_REGNO_RENAME_OK): Document. + 2004-03-05 Jason Merrill <jason@redhat.com> * tree.h (TYPE_HASH): Use TYPE_UID. diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 3ca5aca..1bf6def 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -2072,6 +2072,17 @@ floating registers are not in class @code{GENERAL_REGS}, they will not be used unless some pattern's constraint asks for one. @end defmac +@defmac HARD_REGNO_RENAME_OK (@var{from}, @var{to}) +A C expression that is nonzero if it is OK to rename a hard register +@var{from} to another hard register @var{to}. + +One common use of this macro is to prevent renaming of a register to +another register that is not saved by a prologue in an interrupt +handler. + +The default is always nonzero. +@end defmac + @defmac MODES_TIEABLE_P (@var{mode1}, @var{mode2}) A C expression that is nonzero if a value of mode @var{mode1} is accessible in mode @var{mode2} without copying. |