h8300.md: Remove an incorrect comment about peephole2.

	* config/h8300/h8300.md: Remove an incorrect comment about
	peephole2.  Add comments.

From-SVN: r77618

gcc/ChangeLog

+2004-02-10  Kazu Hirata  <kazu@cs.umass.edu>
+
+	* config/h8300/h8300.md: Remove an incorrect comment about
+	peephole2.  Add comments.
+
 2004-02-10  Josef Zlomek  <zlomekj@suse.cz>
 
 	PR/14058

gcc/config/h8300/h8300.md

@@ -4971,9 +4971,12 @@
    operands[7] = gen_int_mode (INTVAL (operands[2]), QImode);")
 
 ;; These triggers right at the end of allocation of locals in the
-;; prologue.  The only profitable cases are when we have stack
-;; adjustment of -4 or -12.  That of -8 won't happen because it is
-;; always split into two consecutive subtractions of -4.
+;; prologue (and possibly at other places).
+
+;; stack adjustment of -8, generate one push
+;;
+;; before : 14 bytes, 22 clocks
+;; after  :  8 bytes, 20 clocks
 
 (define_peephole2
   [(set (reg:SI SP_REG)
@@ -4987,6 +4990,11 @@
 	(match_dup 0))]
   "")
 
+;; stack adjustment of -12, generate one push
+;;
+;; before : 10 bytes, 14 clocks
+;; after  :  8 bytes, 14 clocks
+
 (define_peephole2
   [(set (reg:SI SP_REG)
 	(plus:SI (reg:SI SP_REG)