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arc: Update doloop_end patterns

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ARC processor can use LP instruction to implement zero overlay loops.
The current inplementation doesn't handle the unlikely situation when
the loop iterator is located in memory.  Refurbish the loop_end insn
pattern into a define_insn_and_split pattern.

gcc/
2021-07-09  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.md (loop_end): Change it to
	define_insn_and_split.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
This commit is contained in:
Claudiu Zissulescu 2021-06-09 12:12:57 +03:00
parent dd4778a59b
commit 174e75a210
1 changed files with 21 additions and 27 deletions
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48
gcc/config/arc/arc.md
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@ -4962,7 +4962,7 @@ core_3, archs4x, archs4xd, archs4xd_slow"
(define_expand "doloop_end"
[(parallel [(set (pc)
(if_then_else
(ne (match_operand 0 "" "")
(ne (match_operand 0 "nonimmediate_operand")
(const_int 1))
(label_ref (match_operand 1 "" ""))
(pc)))
@ -4988,44 +4988,38 @@ core_3, archs4x, archs4xd, archs4xd_slow"
;; if by any chance the lp_count is not used, then use an 'r'
;; register, instead of going to memory.
(define_insn "loop_end"
;; split pattern for the very slim chance when the loop register is
;; memory.
(define_insn_and_split "loop_end"
[(set (pc)
(if_then_else (ne (match_operand:SI 2 "nonimmediate_operand" "0,m")
(if_then_else (ne (match_operand:SI 0 "nonimmediate_operand" "+r,!m")
(const_int 1))
(label_ref (match_operand 1 "" ""))
(pc)))
(set (match_operand:SI 0 "nonimmediate_operand" "=r,m")
(plus (match_dup 2) (const_int -1)))
(unspec [(const_int 0)] UNSPEC_ARC_LP)
(clobber (match_scratch:SI 3 "=X,&r"))]
""
"; ZOL_END, begins @%l1"
[(set_attr "length" "0")
(set_attr "predicable" "no")
(set_attr "type" "loop_end")])
;; split pattern for the very slim chance when the loop register is
;; memory.
(define_split
[(set (pc)
(if_then_else (ne (match_operand:SI 0 "memory_operand")
(const_int 1))
(label_ref (match_operand 1 ""))
(pc)))
(set (match_dup 0) (plus (match_dup 0) (const_int -1)))
(unspec [(const_int 0)] UNSPEC_ARC_LP)
(clobber (match_scratch:SI 2))]
"memory_operand (operands[0], SImode)"
(clobber (match_scratch:SI 2 "=X,&r"))]
""
"@
; ZOL_END, begins @%l1
#"
"reload_completed && memory_operand (operands[0], Pmode)"
[(set (match_dup 2) (match_dup 0))
(set (match_dup 2) (plus:SI (match_dup 2) (const_int -1)))
(parallel
[(set (reg:CC_ZN CC_REG)
(compare:CC_ZN (plus:SI (match_dup 2) (const_int -1))
(const_int 0)))
(set (match_dup 2) (plus:SI (match_dup 2) (const_int -1)))])
(set (match_dup 0) (match_dup 2))
(set (reg:CC CC_REG) (compare:CC (match_dup 2) (const_int 0)))
(set (pc)
(if_then_else (ne (reg:CC CC_REG)
(if_then_else (ne (reg:CC_ZN CC_REG)
(const_int 0))
(label_ref (match_dup 1))
(pc)))]
"")
""
[(set_attr "length" "0,24")
(set_attr "predicable" "no")
(set_attr "type" "loop_end")])
(define_insn "loop_fail"
[(set (reg:SI LP_COUNT)