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-Right now there is no documentation for the GCC tree -> rtl interfaces
-(or more generally the interfaces for adding new languages).
-
-Such documentation would be of great benefit to the project. Until such
-time as we can formally start documenting the interface this file will
-serve as a repository for information on these interface and any incompatible
-changes we've made.
-
-2004-09-09:
- In an effort to decrease execution time, single char tree code
- classes were changed to enumerated values.
-
- Old way:
-
- DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0)
-
- New way:
-
- DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0)
-
-2001-02-26:
- A DECL_INITIAL of NULL_TREE or error_mark_node in a VAR_DECL is no longer
- taken to signify a tentative definition which should not be emitted until
- end-of-file. Frontends which want that behavior should set
- DECL_DEFER_OUTPUT before calling rest_of_decl_compilation.
-
-Feb 1, 1998:
-
- GCC used to store structure sizes & offsets to elements as bitsize
- quantities. This causes problems because a structure can only be
- (target memsize / 8) bytes long (this may effect arrays too). This
- is particularly problematical on machines with small address spaces.
-
- So:
-
- All trees that represent sizes in bits should have a TREE_TYPE of
- bitsizetype (rather than sizetype).
-
- Accordingly, when such values are computed / initialized, care has to
- be takes to use / compute the proper type.
-
- When a size in bits is converted into a size in bytes, which is expressed
- in trees, care should be taken to change the tree's type again to sizetype.
-
-?? 1997:
-
- In an effort to decrease cache thrashing and useless loads we've changed the
- third argument to the DEFTREECODE macro to be a single char. This will
- affect languages that defined their own tree codes (usually in a .def file).
-
- Old way:
-
- DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", "d", 0)
-
- New way:
-
- DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0)
-
-
-Copyright (C) 1998-2013 Free Software Foundation, Inc.
-
-Copying and distribution of this file, with or without modification,
-are permitted in any medium without royalty provided the copyright
-notice and this notice are preserved.