simplify_rtx.c (simplify_subreg): Keep subregs on return values...

[gcc.git] / gcc / ChangeLog

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+Mon Jun  4 16:50:33 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+       * simplify_rtx.c (simplify_subreg): Keep subregs on return values,
+       check CLASS_CANNOT_CHANGE_MODE before avoiding subreg on hard reg,
+       in case register wasn't OK previously, accept it now; allow
+       subregs of frame pointer if reload completed and frame pointer
+       is not needed.
+
+       * combine.c (sombine_simplify_rtx): Fix comment;
+       use subreg_lowpart_offset instead of subreg_lowpart_p
+       (gen_lowpart_for_combine): Use subreg_lowpart_offset.
+       * rtl.h (subreg_lowpart_parts_p): Kill.
+       (subreg_lowpart_offset, subreg_highpart_offset): Declare.
+       * simplify-rtx.c (simplify_subreg): Use subreg_lowpart_offset.
+       * emit-rtl.c (gen_lowpart_SUBREG): Use subreg_lowpart_offset;
+       (gen_lowpart_common): Likewise.
+       (subreg_lowpart_p): Likewise.
+       (subreg_lowpart_parts_p): Kill.
+       (subreg_lowpart_offset, subreg_highpart_offset): New function.
+
+       * emit-rtl.c (gen_lowpart_common): Use simplify_gen_subreg
+       to simplify SUBREG and REG.
+       (gen_highpart): Use simplify_gen_subreg for all simplifications.
+
+       * emit-rtl.c (gen_realpart, gen_imagpart): Do not handle
+       CONCAT specially.
+
+       * rtlanal.c (replace_regs):  Use simplify_gen_subreg
+
 Mon Jun  4 09:21:19 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
        * tree.def (ARRAY_RANGE_REF): New code.