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h8300.md: Remove an incorrect comment about peephole2.

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

From-SVN: r77618
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Kazu Hirata 2004-02-10 22:40:30 +00:00 • committed by Kazu Hirata
parent 0237b2dc30
commit 2493deee55
2 changed files with 16 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
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

14
gcc/config/h8300/h8300.md
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@ -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)