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Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index bdd1dd3..716be18 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -2854,36 +2854,6 @@ as below: @end smallexample @end defmac -@deftypefn {Target Hook} {const reg_class_t *} TARGET_IRA_COVER_CLASSES (void) -Return an array of cover classes for the Integrated Register Allocator -(@acronym{IRA}). Cover classes are a set of non-intersecting register -classes covering all hard registers used for register allocation -purposes. If a move between two registers in the same cover class is -possible, it should be cheaper than a load or store of the registers. -The array is terminated by a @code{LIM_REG_CLASSES} element. - -The order of cover classes in the array is important. If two classes -have the same cost of usage for a pseudo, the class occurred first in -the array is chosen for the pseudo. - -This hook is called once at compiler startup, after the command-line -options have been processed. It is then re-examined by every call to -@code{target_reinit}. - -The default implementation returns @code{IRA_COVER_CLASSES}, if defined, -otherwise there is no default implementation. You must define either this -macro or @code{IRA_COVER_CLASSES} in order to use the integrated register -allocator with Chaitin-Briggs coloring. If the macro is not defined, -the only available coloring algorithm is Chow's priority coloring. - -This hook must not be modified from @code{NULL} to non-@code{NULL} or -vice versa by command-line option processing. -@end deftypefn - -@defmac IRA_COVER_CLASSES -See the documentation for @code{TARGET_IRA_COVER_CLASSES}. -@end defmac - @node Old Constraints @section Obsolete Macros for Defining Constraints @cindex defining constraints, obsolete method |