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[dead store] Add dummy loads to avoid false positives
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Summary:
The liveness checker reported false positives on the arguments of
`__atomic_compare_exchange`. The arguments are needed to call the
library function, even if developers do not need to read them after
the call.

This diff adds dummy loads to avoid dead store false positives on the
library function calls.

Reviewed By: dulmarod

Differential Revision: D55326896

fbshipit-source-id: ac952bc9ed789ba80297a7e850858fa02c6df7f9
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@skcho @facebook-github-bot
skcho authored and facebook-github-bot committed Mar 26, 2024
1 parent ff11cb9 commit d97c4e5
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Showing 5 changed files with 85 additions and 70 deletions.
3 changes: 3 additions & 0 deletions infer/src/clang/cTrans.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -1453,11 +1453,14 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
sil_loc Sil.Ik_compexch
in
let instrs =
(* NOTE: Added dummy loads to avoid dead store false positives. *)
if branch then
[ Sil.Store {e1= ptr_exp; e2= desired_exp; typ; loc= sil_loc}
; Sil.Load {id= Ident.create_fresh Ident.knormal; e= ptr_exp; typ; loc= sil_loc}
; Sil.Store {e1= exp_to_init; e2= Exp.one; typ= ret_typ; loc= sil_loc} ]
else
[ Sil.Store {e1= expected_exp; e2= Exp.Var ptr_id; typ; loc= sil_loc}
; Sil.Load {id= Ident.create_fresh Ident.knormal; e= expected_exp; typ; loc= sil_loc}
; Sil.Store {e1= exp_to_init; e2= Exp.zero; typ= ret_typ; loc= sil_loc} ]
in
let return = (exp_to_init, ret_typ) in
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58 changes: 29 additions & 29 deletions infer/tests/codetoanalyze/c/frontend/atomic_expr/atomic_with_others.c.dot
View file
Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,7 @@ digraph cfg {


"arithmetic.26e816805c2eb540_20" -> "arithmetic.26e816805c2eb540_19" ;
"load_store_exchange.3da178fb2a20c1b2_1" [label="1: Start load_store_exchange\nFormals: \nLocals: 0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool 0$?%__sil_tmpSIL_temp_compare_exchange___n$23:_Bool 0$?%__sil_tmpSIL_temp_conditional___n$30:void* 0$?%__sil_tmpSIL_temp_conditional___n$34:void* 0$?%__sil_tmpSIL_temp_conditional___n$38:int a2:void a:void _a:int p:int** b:_Bool \n " color=yellow style=filled]
"load_store_exchange.3da178fb2a20c1b2_1" [label="1: Start load_store_exchange\nFormals: \nLocals: 0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool 0$?%__sil_tmpSIL_temp_compare_exchange___n$25:_Bool 0$?%__sil_tmpSIL_temp_conditional___n$34:void* 0$?%__sil_tmpSIL_temp_conditional___n$38:void* 0$?%__sil_tmpSIL_temp_conditional___n$42:int a2:void a:void _a:int p:int** b:_Bool \n " color=yellow style=filled]


"load_store_exchange.3da178fb2a20c1b2_1" -> "load_store_exchange.3da178fb2a20c1b2_39" ;
Expand All @@ -100,15 +100,15 @@ digraph cfg {


"load_store_exchange.3da178fb2a20c1b2_5" -> "load_store_exchange.3da178fb2a20c1b2_6" ;
"load_store_exchange.3da178fb2a20c1b2_6" [label="6: Atomic compare exchange branch \n *&_a:int=n$8 [line 50, column 3]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool=1 [line 50, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_6" [label="6: Atomic compare exchange branch \n *&_a:int=n$8 [line 50, column 3]\n n$10=*&_a:int [line 50, column 3]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool=1 [line 50, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_6" -> "load_store_exchange.3da178fb2a20c1b2_3" ;
"load_store_exchange.3da178fb2a20c1b2_7" [label="7: Prune (false branch, atomic compare exchange) \n PRUNE(!(n$4 == n$7), false); [line 50, column 3]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_7" -> "load_store_exchange.3da178fb2a20c1b2_8" ;
"load_store_exchange.3da178fb2a20c1b2_8" [label="8: Atomic compare exchange branch \n *n$6:int=n$4 [line 50, column 3]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool=0 [line 50, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_8" [label="8: Atomic compare exchange branch \n *n$6:int=n$4 [line 50, column 3]\n n$11=*n$6:int [line 50, column 3]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool=0 [line 50, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_8" -> "load_store_exchange.3da178fb2a20c1b2_3" ;
Expand All @@ -117,92 +117,92 @@ digraph cfg {

"load_store_exchange.3da178fb2a20c1b2_9" -> "load_store_exchange.3da178fb2a20c1b2_5" ;
"load_store_exchange.3da178fb2a20c1b2_9" -> "load_store_exchange.3da178fb2a20c1b2_7" ;
"load_store_exchange.3da178fb2a20c1b2_10" [label="10: Compound statement \n n$10=*&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool [line 50, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_10" [label="10: Compound statement \n n$12=*&0$?%__sil_tmpSIL_temp_compare_exchange___n$9:_Bool [line 50, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_10" -> "load_store_exchange.3da178fb2a20c1b2_2" ;
"load_store_exchange.3da178fb2a20c1b2_11" [label="11: + \n END_BRANCHES\n " ]


"load_store_exchange.3da178fb2a20c1b2_11" -> "load_store_exchange.3da178fb2a20c1b2_17" ;
"load_store_exchange.3da178fb2a20c1b2_12" [label="12: Prune (true branch, atomic compare exchange) \n PRUNE((n$18 == n$19), true); [line 47, column 14]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_12" [label="12: Prune (true branch, atomic compare exchange) \n PRUNE((n$20 == n$21), true); [line 47, column 14]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_12" -> "load_store_exchange.3da178fb2a20c1b2_13" ;
"load_store_exchange.3da178fb2a20c1b2_13" [label="13: Atomic compare exchange branch \n *n$17:int=n$22 [line 47, column 14]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$23:_Bool=1 [line 47, column 14]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_13" [label="13: Atomic compare exchange branch \n *n$19:int=n$24 [line 47, column 14]\n n$26=*n$19:int [line 47, column 14]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$25:_Bool=1 [line 47, column 14]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_13" -> "load_store_exchange.3da178fb2a20c1b2_11" ;
"load_store_exchange.3da178fb2a20c1b2_14" [label="14: Prune (false branch, atomic compare exchange) \n PRUNE(!(n$18 == n$19), false); [line 47, column 14]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_14" [label="14: Prune (false branch, atomic compare exchange) \n PRUNE(!(n$20 == n$21), false); [line 47, column 14]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_14" -> "load_store_exchange.3da178fb2a20c1b2_15" ;
"load_store_exchange.3da178fb2a20c1b2_15" [label="15: Atomic compare exchange branch \n *&_a:int=n$18 [line 47, column 14]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$23:_Bool=0 [line 47, column 14]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_15" [label="15: Atomic compare exchange branch \n *&_a:int=n$20 [line 47, column 14]\n n$27=*&_a:int [line 47, column 14]\n *&0$?%__sil_tmpSIL_temp_compare_exchange___n$25:_Bool=0 [line 47, column 14]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_15" -> "load_store_exchange.3da178fb2a20c1b2_11" ;
"load_store_exchange.3da178fb2a20c1b2_16" [label="16: AtomicExpr \n n$11=*&_a:int [line 48, column 38]\n n$12=*&p:int** [line 48, column 45]\n n$13=*n$12:int* [line 48, column 44]\n n$14=*n$13:int [line 48, column 43]\n n$15=_fun_other_func(0:int,null:int*) [line 48, column 48]\n n$16=*&p:int** [line 48, column 19]\n n$17=*n$16:int* [line 48, column 18]\n n$20=*&p:int** [line 48, column 29]\n n$21=*n$20:int* [line 48, column 28]\n n$22=*n$21:int [line 48, column 27]\n n$18=*n$17:int [line 47, column 14]\n n$19=*&_a:int [line 47, column 14]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_16" [label="16: AtomicExpr \n n$13=*&_a:int [line 48, column 38]\n n$14=*&p:int** [line 48, column 45]\n n$15=*n$14:int* [line 48, column 44]\n n$16=*n$15:int [line 48, column 43]\n n$17=_fun_other_func(0:int,null:int*) [line 48, column 48]\n n$18=*&p:int** [line 48, column 19]\n n$19=*n$18:int* [line 48, column 18]\n n$22=*&p:int** [line 48, column 29]\n n$23=*n$22:int* [line 48, column 28]\n n$24=*n$23:int [line 48, column 27]\n n$20=*n$19:int [line 47, column 14]\n n$21=*&_a:int [line 47, column 14]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_16" -> "load_store_exchange.3da178fb2a20c1b2_12" ;
"load_store_exchange.3da178fb2a20c1b2_16" -> "load_store_exchange.3da178fb2a20c1b2_14" ;
"load_store_exchange.3da178fb2a20c1b2_17" [label="17: Call _fun_other_func \n n$24=*&0$?%__sil_tmpSIL_temp_compare_exchange___n$23:_Bool [line 47, column 14]\n n$25=_fun_other_func(n$24:int,null:int*) [line 47, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_17" [label="17: Call _fun_other_func \n n$28=*&0$?%__sil_tmpSIL_temp_compare_exchange___n$25:_Bool [line 47, column 14]\n n$29=_fun_other_func(n$28:int,null:int*) [line 47, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_17" -> "load_store_exchange.3da178fb2a20c1b2_9" ;
"load_store_exchange.3da178fb2a20c1b2_18" [label="18: Call _fun_other_func \n n$26=*&a2:int [line 46, column 14]\n *&a2:int=2 [line 46, column 14]\n n$27=_fun_other_func(n$26:int,null:int*) [line 46, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_18" [label="18: Call _fun_other_func \n n$30=*&a2:int [line 46, column 14]\n *&a2:int=2 [line 46, column 14]\n n$31=_fun_other_func(n$30:int,null:int*) [line 46, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_18" -> "load_store_exchange.3da178fb2a20c1b2_16" ;
"load_store_exchange.3da178fb2a20c1b2_19" [label="19: BinaryOperatorStmt: Assign \n n$28=*&a:int [line 45, column 8]\n *&a:int=2 [line 45, column 8]\n *&_a:int=n$28 [line 45, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_19" [label="19: BinaryOperatorStmt: Assign \n n$32=*&a:int [line 45, column 8]\n *&a:int=2 [line 45, column 8]\n *&_a:int=n$32 [line 45, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_19" -> "load_store_exchange.3da178fb2a20c1b2_18" ;
"load_store_exchange.3da178fb2a20c1b2_20" [label="20: + \n END_BRANCHES\n " ]


"load_store_exchange.3da178fb2a20c1b2_20" -> "load_store_exchange.3da178fb2a20c1b2_25" ;
"load_store_exchange.3da178fb2a20c1b2_21" [label="21: Prune (true branch, boolean exp (terminated)) \n n$31=*&b:_Bool [line 44, column 7]\n PRUNE(n$31, true); [line 44, column 7]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_21" [label="21: Prune (true branch, boolean exp (terminated)) \n n$35=*&b:_Bool [line 44, column 7]\n PRUNE(n$35, true); [line 44, column 7]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_21" -> "load_store_exchange.3da178fb2a20c1b2_23" ;
"load_store_exchange.3da178fb2a20c1b2_22" [label="22: Prune (false branch, boolean exp (terminated)) \n n$31=*&b:_Bool [line 44, column 7]\n PRUNE(!n$31, false); [line 44, column 7]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_22" [label="22: Prune (false branch, boolean exp (terminated)) \n n$35=*&b:_Bool [line 44, column 7]\n PRUNE(!n$35, false); [line 44, column 7]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_22" -> "load_store_exchange.3da178fb2a20c1b2_24" ;
"load_store_exchange.3da178fb2a20c1b2_23" [label="23: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$30:void*=&a [line 44, column 7]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_23" [label="23: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$34:void*=&a [line 44, column 7]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_23" -> "load_store_exchange.3da178fb2a20c1b2_20" ;
"load_store_exchange.3da178fb2a20c1b2_24" [label="24: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$30:void*=&a2 [line 44, column 7]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_24" [label="24: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$34:void*=&a2 [line 44, column 7]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_24" -> "load_store_exchange.3da178fb2a20c1b2_20" ;
"load_store_exchange.3da178fb2a20c1b2_25" [label="25: AtomicExpr \n n$29=*&_a:int [line 44, column 24]\n *&_a:int=(n$29 + 1) [line 44, column 24]\n n$32=*&0$?%__sil_tmpSIL_temp_conditional___n$30:void* [line 44, column 7]\n *n$32:int=1 [line 43, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_25" [label="25: AtomicExpr \n n$33=*&_a:int [line 44, column 24]\n *&_a:int=(n$33 + 1) [line 44, column 24]\n n$36=*&0$?%__sil_tmpSIL_temp_conditional___n$34:void* [line 44, column 7]\n *n$36:int=1 [line 43, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_25" -> "load_store_exchange.3da178fb2a20c1b2_19" ;
"load_store_exchange.3da178fb2a20c1b2_26" [label="26: + \n END_BRANCHES\n " ]


"load_store_exchange.3da178fb2a20c1b2_26" -> "load_store_exchange.3da178fb2a20c1b2_31" ;
"load_store_exchange.3da178fb2a20c1b2_27" [label="27: Prune (true branch, boolean exp (terminated)) \n n$35=*&b:_Bool [line 42, column 8]\n PRUNE(n$35, true); [line 42, column 8]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_27" [label="27: Prune (true branch, boolean exp (terminated)) \n n$39=*&b:_Bool [line 42, column 8]\n PRUNE(n$39, true); [line 42, column 8]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_27" -> "load_store_exchange.3da178fb2a20c1b2_29" ;
"load_store_exchange.3da178fb2a20c1b2_28" [label="28: Prune (false branch, boolean exp (terminated)) \n n$35=*&b:_Bool [line 42, column 8]\n PRUNE(!n$35, false); [line 42, column 8]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_28" [label="28: Prune (false branch, boolean exp (terminated)) \n n$39=*&b:_Bool [line 42, column 8]\n PRUNE(!n$39, false); [line 42, column 8]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_28" -> "load_store_exchange.3da178fb2a20c1b2_30" ;
"load_store_exchange.3da178fb2a20c1b2_29" [label="29: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$34:void*=&a [line 42, column 8]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_29" [label="29: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$38:void*=&a [line 42, column 8]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_29" -> "load_store_exchange.3da178fb2a20c1b2_26" ;
"load_store_exchange.3da178fb2a20c1b2_30" [label="30: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$34:void*=&a2 [line 42, column 8]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_30" [label="30: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$38:void*=&a2 [line 42, column 8]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_30" -> "load_store_exchange.3da178fb2a20c1b2_26" ;
"load_store_exchange.3da178fb2a20c1b2_31" [label="31: BinaryOperatorStmt: Assign \n n$36=*&0$?%__sil_tmpSIL_temp_conditional___n$34:void* [line 42, column 8]\n n$37=*n$36:int [line 42, column 8]\n *&_a:int=n$37 [line 42, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_31" [label="31: BinaryOperatorStmt: Assign \n n$40=*&0$?%__sil_tmpSIL_temp_conditional___n$38:void* [line 42, column 8]\n n$41=*n$40:int [line 42, column 8]\n *&_a:int=n$41 [line 42, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_31" -> "load_store_exchange.3da178fb2a20c1b2_21" ;
Expand All @@ -211,33 +211,33 @@ digraph cfg {


"load_store_exchange.3da178fb2a20c1b2_32" -> "load_store_exchange.3da178fb2a20c1b2_38" ;
"load_store_exchange.3da178fb2a20c1b2_33" [label="33: AtomicExpr \n n$39=*&a:int [line 41, column 9]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_33" [label="33: AtomicExpr \n n$43=*&a:int [line 41, column 9]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_33" -> "load_store_exchange.3da178fb2a20c1b2_34" ;
"load_store_exchange.3da178fb2a20c1b2_33" -> "load_store_exchange.3da178fb2a20c1b2_35" ;
"load_store_exchange.3da178fb2a20c1b2_34" [label="34: Prune (true branch, boolean exp (terminated)) \n PRUNE(n$39, true); [line 41, column 9]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_34" [label="34: Prune (true branch, boolean exp (terminated)) \n PRUNE(n$43, true); [line 41, column 9]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_34" -> "load_store_exchange.3da178fb2a20c1b2_36" ;
"load_store_exchange.3da178fb2a20c1b2_35" [label="35: Prune (false branch, boolean exp (terminated)) \n PRUNE(!n$39, false); [line 41, column 9]\n " shape="invhouse"]
"load_store_exchange.3da178fb2a20c1b2_35" [label="35: Prune (false branch, boolean exp (terminated)) \n PRUNE(!n$43, false); [line 41, column 9]\n " shape="invhouse"]


"load_store_exchange.3da178fb2a20c1b2_35" -> "load_store_exchange.3da178fb2a20c1b2_37" ;
"load_store_exchange.3da178fb2a20c1b2_36" [label="36: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$38:int=5 [line 41, column 9]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_36" [label="36: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$42:int=5 [line 41, column 9]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_36" -> "load_store_exchange.3da178fb2a20c1b2_32" ;
"load_store_exchange.3da178fb2a20c1b2_37" [label="37: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$38:int=2 [line 41, column 9]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_37" [label="37: ConditionalStmt Branch \n *&0$?%__sil_tmpSIL_temp_conditional___n$42:int=2 [line 41, column 9]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_37" -> "load_store_exchange.3da178fb2a20c1b2_32" ;
"load_store_exchange.3da178fb2a20c1b2_38" [label="38: BinaryOperatorStmt: Assign \n n$40=*&0$?%__sil_tmpSIL_temp_conditional___n$38:int [line 41, column 9]\n *&_a:int=n$40 [line 41, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_38" [label="38: BinaryOperatorStmt: Assign \n n$44=*&0$?%__sil_tmpSIL_temp_conditional___n$42:int [line 41, column 9]\n *&_a:int=n$44 [line 41, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_38" -> "load_store_exchange.3da178fb2a20c1b2_27" ;
"load_store_exchange.3da178fb2a20c1b2_38" -> "load_store_exchange.3da178fb2a20c1b2_28" ;
"load_store_exchange.3da178fb2a20c1b2_39" [label="39: AtomicExpr \n n$41=*&_a:int [line 40, column 23]\n *&a:int=(1 + n$41) [line 40, column 3]\n " shape="box"]
"load_store_exchange.3da178fb2a20c1b2_39" [label="39: AtomicExpr \n n$45=*&_a:int [line 40, column 23]\n *&a:int=(1 + n$45) [line 40, column 3]\n " shape="box"]


"load_store_exchange.3da178fb2a20c1b2_39" -> "load_store_exchange.3da178fb2a20c1b2_33" ;
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