FreeChainXenon/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

i386.md: Add peephole to merge successive stack adjusts.

Browse source 
* config/i386/i386.md: Add peephole to merge successive stack
	adjusts.

From-SVN: r31443
This commit is contained in:
Zack Weinberg 2000-01-16 17:53:02 +00:00 • committed by Zack Weinberg
parent f83611476f
commit 08439bec5f
2 changed files with 24 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
gcc/ChangeLog
View file

@ -1,3 +1,8 @@
2000-01-16 Zack Weinberg <zack@wolery.cumb.org>
* config/i386/i386.md: Add peephole to merge successive stack
adjusts.
Sat Jan 15 15:41:14 EST 2000 John Wehle (john@feith.com)
* gcse.c (insert_insn_end_bb): Use emit_block_insn_before

19
gcc/config/i386/i386.md
View file

@ -8947,6 +8947,25 @@
[(parallel [(set (match_dup 0) (ashift:SI (match_dup 0) (match_dup 2)))
(clobber (reg:CC 17))])]
"operands[2] = GEN_INT (exact_log2 (INTVAL (operands[1])));")
;; Merge two successive stack adjusts. The combiner doesn't know how
;; to do this, and doesn't see all of them.
;; (reg:SI 7) is %esp.
(define_peephole2
[(parallel[
(set (reg:SI 7)
(plus:SI (reg:SI 7) (match_operand:SI 0 "const_int_operand" "")))
(clobber (reg:CC 17))])
(parallel[
(set (reg:SI 7)
(plus:SI (reg:SI 7) (match_operand:SI 1 "const_int_operand" "")))
(clobber (reg:CC 17))])]
""
[(parallel[
(set (reg:SI 7)
(plus:SI (reg:SI 7) (match_dup 2)))
(clobber (reg:CC 17))])]
"operands[2] = GEN_INT (INTVAL (operands[0]) + INTVAL (operands[1]));")
;; Call-value patterns last so that the wildcard operand does not
;; disrupt insn-recog's switch tables.