i386.md: Revert previous change.

        * config/i386/i386.md: Revert previous change.  Do not apply
        the peephole if the components do not die after the sequence.

From-SVN: r42576

gcc/ChangeLog

+2001-05-25  Richard Henderson  <rth@redhat.com>
+
+	* config/i386/i386.md: Revert previous change.  Do not apply
+	the peephole if the components do not die after the sequence.
+
 2001-05-25  Joseph S. Myers  <jsm28@cam.ac.uk>
 
 	* c-parse.in (array_declarator): New.  Handle C99 constructs.
@@ -16,7 +21,7 @@
 	* extend.texi (Attribute Syntax): Document attributes in parameter
 	array declarators.
 
-2001-05-25  Mark  <mark@codesourcery.com>
+2001-05-25  Mark Mitchell  <mark@codesourcery.com>
 
 	* config/i386/i386.md: Make sure cmpstr peepholes do not 
 	affect liveness information.

gcc/config/i386/i386.md

@@ -15496,7 +15496,7 @@
    (set (reg 17)
 	(compare (match_dup 7) (match_dup 8)))
   ]
-  ""
+  "peep2_reg_dead_p (4, operands[7]) && peep2_reg_dead_p (4, operands[8])"
   [(parallel[
      (set (reg:CC 17)
 	  (compare:CC (mem:BLK (match_dup 4))
@@ -15506,9 +15506,7 @@
      (use (reg:SI 19))
      (clobber (match_dup 0))
      (clobber (match_dup 1))
-     (clobber (match_dup 2))])
-   (clobber (match_dup 7))
-   (clobber (match_dup 8))]
+     (clobber (match_dup 2))])]
   "")
 
 ;; ...and this one handles cmpstr*_1.
@@ -15533,7 +15531,7 @@
    (set (reg 17)
 	(compare (match_dup 7) (match_dup 8)))
   ]
-  ""
+  "peep2_reg_dead_p (4, operands[7]) && peep2_reg_dead_p (4, operands[8])"
   [(parallel[
      (set (reg:CC 17)
 	  (if_then_else:CC (ne (match_dup 6)
@@ -15546,9 +15544,7 @@
      (use (reg:SI 19))
      (clobber (match_dup 0))
      (clobber (match_dup 1))
-     (clobber (match_dup 2))])
-   (clobber (match_dup 7))
-   (clobber (match_dup 8))]
+     (clobber (match_dup 2))])]
   "")