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Remove redundant compare in shift loop on H8

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gcc/ChangeLog

	* config/h8300/shiftrotate.md (shift-by-variable patterns): Update to
	generate condition code aware RTL directly.
This commit is contained in:
Jeff Law 2021-07-05 17:23:43 -04:00
parent 7d69791972
commit 1562c7987b
1 changed files with 16 additions and 6 deletions
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22
gcc/config/h8300/shiftrotate.md
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@ -385,10 +385,15 @@
(parallel
[(set (match_dup 0)
(match_op_dup 2 [(match_dup 0) (const_int 1)]))
(clobber (scratch:QI))])
(set (match_dup 1) (plus:QI (match_dup 1) (const_int -1)))
(clobber (reg:CC CC_REG))])
(parallel
[(set (reg:CCZN CC_REG)
(compare:CCZN
(plus:QI (match_dup 1) (const_int -1))
(const_int 0)))
(set (match_dup 1) (plus:QI (match_dup 1) (const_int -1)))])
(set (pc)
(if_then_else (ne (match_dup 1) (const_int 0))
(if_then_else (ne (reg:CCZN CC_REG) (const_int 0))
(label_ref (match_dup 4))
(pc)))
(match_dup 5)]
@ -416,10 +421,15 @@
(parallel
[(set (match_dup 0)
(match_op_dup 2 [(match_dup 0) (const_int 1)]))
(clobber (scratch:QI))])
(set (match_dup 3) (plus:QI (match_dup 3) (const_int -1)))
(clobber (reg:CC CC_REG))])
(parallel
[(set (reg:CCZN CC_REG)
(compare:CCZN
(plus:QI (match_dup 3) (const_int -1))
(const_int 0)))
(set (match_dup 3) (plus:QI (match_dup 3) (const_int -1)))])
(set (pc)
(if_then_else (ne (match_dup 3) (const_int 0))
(if_then_else (ne (reg:CCZN CC_REG) (const_int 0))
(label_ref (match_dup 4))
(pc)))
(match_dup 5)]