alpha.c (alpha_emit_set_const): Add a REG_EQUAL note if a non-trivial load was emitted.

        * config/alpha/alpha.c (alpha_emit_set_const): Add a REG_EQUAL note
        if a non-trivial load was emitted.
        (alpha_emit_set_const_1): Remove obsolete extension.  Fix thinko
        in high+extra+low case.

From-SVN: r51428

gcc/ChangeLog

 2002-03-26  Richard Henderson  <rth@redhat.com>
 
+	* config/alpha/alpha.c (alpha_emit_set_const): Add a REG_EQUAL note
+	if a non-trivial load was emitted.
+	(alpha_emit_set_const_1): Remove obsolete extension.  Fix thinko
+	in high+extra+low case.
+
+2002-03-26  Richard Henderson  <rth@redhat.com>
+
 	* config.gcc (sparc*-solaris): Use float_format=sparc.
 
 2002-03-26  Richard Henderson  <rth@redhat.com>

gcc/config/alpha/alpha.c

@@ -2250,8 +2250,18 @@ alpha_emit_set_const (target, mode, c, n)
     }
 
   /* Try 1 insn, then 2, then up to N.  */
-  for (i = 1; i <= n && result == 0; i++)
-    result = alpha_emit_set_const_1 (target, mode, c, i);
+  for (i = 1; i <= n; i++)
+    {
+      result = alpha_emit_set_const_1 (target, mode, c, i);
+      if (result)
+	{
+	  rtx insn = get_last_insn ();
+	  rtx set = single_set (insn);
+	  if (! CONSTANT_P (SET_SRC (set)))
+	    set_unique_reg_note (get_last_insn (), REG_EQUAL, GEN_INT (c));
+	  break;
+	}
+    }
 
   /* Allow for the case where we changed the mode of TARGET.  */
   if (result == target)
@@ -2276,15 +2286,6 @@ alpha_emit_set_const_1 (target, mode, c, n)
     = (flag_expensive_optimizations && !no_new_pseudos ? 0 : target);
   rtx temp, insn;
 
-#if HOST_BITS_PER_WIDE_INT == 64
-  /* We are only called for SImode and DImode.  If this is SImode, ensure that
-     we are sign extended to a full word.  This does not make any sense when
-     cross-compiling on a narrow machine.  */
-
-  if (mode == SImode)
-    c = ((c & 0xffffffff) ^ 0x80000000) - 0x80000000;
-#endif
-
   /* If this is a sign-extended 32-bit constant, we can do this in at most
      three insns, so do it if we have enough insns left.  We always have
      a sign-extended 32-bit constant when compiling on a narrow machine.  */
@@ -2337,6 +2338,7 @@ alpha_emit_set_const_1 (target, mode, c, n)
 	      insn = gen_rtx_PLUS (mode, temp, GEN_INT (extra << 16));
 	      insn = gen_rtx_SET (VOIDmode, subtarget, insn);
 	      emit_insn (insn);
+	      temp = subtarget;
 	    }
 
 	  if (target == NULL)