OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

* config/h8300/h8300.md (a peephole2): New.

Browse Source 
From-SVN: r63719
This commit is contained in:
Kazu Hirata 2003-03-03 12:57:10 +00:00 committed by Kazu Hirata
parent 1f7e87909e
commit 6967a12651
2 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
2003-03-03 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (a peephole2): New.
2003-03-03 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (*extzv_8_8): Use shorter code when

17
gcc/config/h8300/h8300.md
View File

@ -3561,6 +3561,23 @@
? gen_rtx_GE (VOIDmode, cc0_rtx, const0_rtx)
: gen_rtx_LT (VOIDmode, cc0_rtx, const0_rtx));")
(define_peephole2
[(set (match_operand:SI 0 "register_operand" "")
(match_operand:SI 1 "register_operand" ""))
(set (match_dup 0)
(and:SI (match_dup 0)
(const_int 255)))]
"(TARGET_H8300H || TARGET_H8300S)
&& REG_P (operands[0])
&& REG_P (operands[1])
&& REGNO (operands[0]) != REGNO (operands[1])"
[(set (match_dup 0)
(const_int 0))
(set (strict_low_part (match_dup 2))
(match_dup 3))]
"operands[2] = gen_rtx_REG (QImode, REGNO (operands[0]));
operands[3] = gen_rtx_REG (QImode, REGNO (operands[1]));")
;; (compare (reg:SI) (const_int)) takes 6 bytes, so we try to achieve
;; the equivalent with shorter sequences. Here is the summary. Cases
;; are grouped for each define_peephole2.