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re PR target/55212 ([SH] Switch to LRA)

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gcc/
	PR target/55212
	* config/sh/sh.md (*addsi3_compact): Add parentheses around &&
	condition.  Add comments.

From-SVN: r218999
This commit is contained in:
Oleg Endo 2014-12-21 23:37:42 +00:00
parent 9b09bfac86
commit 463d52c237
2 changed files with 15 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-12-17 Oleg Endo <olegendo@gcc.gnu.org>
PR target/55212
* config/sh/sh.md (*addsi3_compact): Add parentheses around &&
condition. Add comments.
2014-12-20 Segher Boessenkool <segher@kernel.crashing.org>
PR target/64358

12
gcc/config/sh/sh.md
View file

@ -2056,14 +2056,20 @@
[(set_attr "type" "arith_media")
(set_attr "highpart" "ignore")])
;; The *addsi3_compact is made an insn_and_split and accepts actually
;; impossible constraints to make LRA's register elimination work well on SH.
;; The problem is that LRA expects something like
;; (set rA (plus rB (const_int N)))
;; to work. We can do that, but we have to split out an additional reg-reg
;; copy before the actual add insn.
(define_insn_and_split "*addsi3_compact"
[(set (match_operand:SI 0 "arith_reg_dest" "=r,&r")
(plus:SI (match_operand:SI 1 "arith_operand" "%0,r")
(match_operand:SI 2 "arith_or_int_operand" "rI08,rn")))]
"TARGET_SH1
&& (rtx_equal_p (operands[0], operands[1])
&& arith_operand (operands[2], SImode))
|| ! reg_overlap_mentioned_p (operands[0], operands[1])"
&& ((rtx_equal_p (operands[0], operands[1])
&& arith_operand (operands[2], SImode))
|| ! reg_overlap_mentioned_p (operands[0], operands[1]))"
"@
add %2,%0
#"