(assign_parms): Tighten up code that makes REG_EQUIV notes for parms.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@12186 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/function.c b/gcc/function.c
index ee9ecf3..909b695 100644 (file)
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -3869,29 +3869,34 @@ assign_parms (fndecl, second_time)
                                  XEXP (entry_parm, 0)))
            {
              rtx linsn = get_last_insn ();
+             rtx sinsn, set;
 
              /* Mark complex types separately.  */
              if (GET_CODE (parmreg) == CONCAT)
-               {
-                 REG_NOTES (linsn)
-                     = gen_rtx (EXPR_LIST, REG_EQUIV,
-                                parm_reg_stack_loc[regnoi], REG_NOTES (linsn));
-
-                 /* Now search backward for where we set the real part.  */
-                 for (; linsn != 0
-                      && ! reg_referenced_p (parm_reg_stack_loc[regnor],
-                                             PATTERN (linsn));
-                      linsn = prev_nonnote_insn (linsn))
-                   ;
-
-                 REG_NOTES (linsn)
-                     = gen_rtx (EXPR_LIST, REG_EQUIV,
-                                parm_reg_stack_loc[regnor], REG_NOTES (linsn));
-               }
-             else
+               /* Scan backwards for the set of the real and
+                  imaginary parts.  */
+               for (sinsn = linsn; sinsn != 0;
+                    sinsn = prev_nonnote_insn (sinsn))
+                 {
+                   set = single_set (sinsn);
+                   if (set != 0
+                       && SET_DEST (set) == regno_reg_rtx [regnoi])
+                     REG_NOTES (sinsn)
+                       = gen_rtx (EXPR_LIST, REG_EQUIV,
+                                  parm_reg_stack_loc[regnoi],
+                                  REG_NOTES (sinsn));
+                   else if (set != 0
+                            && SET_DEST (set) == regno_reg_rtx [regnor])
+                     REG_NOTES (sinsn)
+                       = gen_rtx (EXPR_LIST, REG_EQUIV,
+                                  parm_reg_stack_loc[regnor],
+                                  REG_NOTES (sinsn));
+                 }
+             else if ((set = single_set (linsn)) != 0
+                      && SET_DEST (set) == parmreg)
                REG_NOTES (linsn)
-                = gen_rtx (EXPR_LIST, REG_EQUIV,
-                           entry_parm, REG_NOTES (linsn));
+                 = gen_rtx (EXPR_LIST, REG_EQUIV,
+                            entry_parm, REG_NOTES (linsn));
            }
 
          /* For pointer data type, suggest pointer register.  */