* explow.c (force_reg): Avoid useless REG_EQUAL notes.

From-SVN: r63187

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 98f1146f99632d933b02bc0b2a797e5b038e80db..efac978ff3c749f452ca839202ecc28d42131381 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2003-02-20  Roger Sayle  <roger@eyesopen.com>
+
+       * explow.c (force_reg): Avoid useless REG_EQUAL notes.
+
 2003-02-20  Toon Moene  <toon@moene.indiv.nluug.nl>
 
        PR fortran/9038
@@ -7,11 +11,14 @@
 
 Thu Feb 20 21:41:19 CET 2003  Jan Hubicka  <jh@suse.cz>
 
-       * toplev.c (flag_sched2_use_superblocks, flag_sched2_use_traces):  New global variables.
-       (lang_independent_options):  Add -fsched2-use-superblocks -fsced2-use-traces.
+       * toplev.c (flag_sched2_use_superblocks, flag_sched2_use_traces): New
+       global variables.
+       (lang_independent_options):  Add -fsched2-use-superblocks
+       -fsced2-use-traces.
        (rest_of_compilation): Deal with it.
        * invoke.texi (-fsched2-use-traces, fsched2-use-superblocks):  Declare.
-       * flags.h (flag_sched2_use_superblocks, flag_sched2_use_traces): Declare.
+       * flags.h (flag_sched2_use_superblocks, flag_sched2_use_traces):
+       Declare.
        * rtl.h (reg_to_stack):  Update prototype.
        * reg-stack.c (reg_to_stack): Return when something has changed;
        update liveness when executing after superblock scheduling.

diff --git a/gcc/explow.c b/gcc/explow.c
index df5bcf659ef558f747954715482a59cc4b88cf12..fb133687c4abcd0fe4ddbf6d7903dea2987d0ef1 100644 (file)
--- a/gcc/explow.c
+++ b/gcc/explow.c
@@ -775,7 +775,8 @@ force_reg (mode, x)
      if INSN set something else (such as a SUBREG of TEMP).  */
   if (CONSTANT_P (x)
       && (set = single_set (insn)) != 0
-      && SET_DEST (set) == temp)
+      && SET_DEST (set) == temp
+      && ! rtx_equal_p (x, SET_SRC (set)))
     set_unique_reg_note (insn, REG_EQUAL, x);
 
   return temp;