* Global CSE and constant/copy propagation.

        * Makefile.in (OBJS): Add gcse.o
        (STAGESTUFF): Add *.gcse.
        (gcse.o): Add dependencies.
        (mostlyclean): Remove *.gcse and */*.gcse.
        * gcse.c: New file.
        * loop.c (loop_optimize): Move call to init_alias_analysis.
        * recog.c (validate_replace_src): New function.
        * toplev.c (gcse_dump): New global variable.
        (flag_gcse, gcse_time): Likewise.
        (compile_file): Initialize gcse_time and clean out the gcse dump
        file if necessary.
        (rest_of_compilation): Call gcse_main as requested.  Dump RTL
        after gcse if requested.
        (main): Enable gcse for -O2 and above.  Handle -dG.  Enable gcse
        dumps for -da.
        * gcc.texi: Add gcse related internal documentation.
        * invoke.texi: Note new command line options for gcse.
        * tm.texi: Document AVOID_CCMODE_COPIES.
        * mips.h (AVOID_CCMODE_COPIES): Define.

Co-Authored-By: Jeffrey A Law <law@cygnus.com>

From-SVN: r19901

1 files changed, 7 insertions, 1 deletions

diff --git a/gcc/loop.c b/gcc/loop.c
index ce0b9b0..8bc4ef2 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -400,7 +400,6 @@ loop_optimize (f, dumpfile, unroll_p)
   loop_dump_stream = dumpfile;
 
   init_recog_no_volatile ();
-  init_alias_analysis ();
 
   max_reg_before_loop = max_reg_num ();
 
@@ -477,6 +476,13 @@ loop_optimize (f, dumpfile, unroll_p)
      function.  */
   reg_scan (f, max_reg_num (), 1);
 
+  /* This must occur after reg_scan so that registers created by gcse
+     will have entries in the register tables.
+
+     We could have added a call to reg_scan after gcse_main in toplev.c,
+     but moving this call to init_alias_analysis is more efficient.  */
+  init_alias_analysis ();
+
   /* See if we went too far.  */
   if (get_max_uid () > max_uid_for_loop)
     abort ();