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llvm-project/polly/test/CodeGen/OpenMP/single_loop.ll
Michael Kruse 7a0f7dbf2d [Polly] Introduce PhaseManager and remove LPM support (#125442) (#167560) 
Reapply of a22d1c2225. Using this PR for
pre-merge CI.

Instead of relying on any pass manager to schedule Polly's passes, add
Polly's own pipeline manager which is seen as a monolithic pass in
LLVM's pass manager. Polly's former passes are now phases of the new
PhaseManager component.

Relying on LLVM's pass manager (the legacy as well as the New Pass
Manager) to manage Polly's phases never was a good fit that the
PhaseManager resolves:

* Polly passes were modifying analysis results, in particular RegionInfo
and ScopInfo. This means that there was not just one unique and
"definite" analysis result, the actual result depended on which analyses
ran prior, and the pass manager was not allowed to throw away cached
analyses or prior SCoP optimizations would have been forgotten. The LLVM
pass manger's persistance of analysis results is not contractual but
designed for caching.

* Polly depends on a particular execution order of passes and regions
(e.g. regression tests, invalidation of consecutive SCoPs). LLVM's pass
manager does not guarantee any excecution order.

* Polly does not completely preserve DominatorTree, RegionInfo,
LoopInfo, or ScalarEvolution, but only as-needed for Polly's own uses.
Because the ScopDetection object stores references to those analyses, it
still had to lie to the pass manager that they would be preserved, or
the pass manager would have released and recomputed the invalidated
analysis objects that ScopDetection/ScopInfo was still referencing. To
ensure that no non-Polly pass would see these not-completely-preserved
analyses, all analyses still had to be thrown away after the
ScopPassManager, respectively with a BarrierNoopPass in case of the LPM.
 
* The NPM's PassInstrumentation wraps the IR unit into an `llvm::Any`
object, but implementations such as PrintIRInstrumentation call
llvm_unreachable on encountering an unknown IR unit, such as SCoPs, with
no extension points to add support. Hence LLVM crashes when dumping IR
between SCoP passes (such as `-print-before-changed` with Polly being
active).

The new PhaseManager uses some command line options that previously
belonged to Polly's legacy passes, such as `-polly-print-detect` (so the
option will continue to work). Hence the LPM support is incompatible
with the new approach and support for it is removed.
2025-11-14 00:45:54 +01:00

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; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly-custom<ast>' -polly-print-ast -disable-output < %s | FileCheck %s -check-prefix=AST
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly<no-default-opts>' -S -verify-dom-info < %s | FileCheck %s -check-prefix=IR
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly-custom<import-jscop;ast>' -polly-print-ast -disable-output < %s | FileCheck %s -check-prefix=AST-STRIDE4
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly-custom<import-jscop;codegen>' -S < %s | FileCheck %s -check-prefix=IR-STRIDE4
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly<no-default-opts>' -polly-omp-backend=LLVM -polly-scheduling=static -polly-scheduling-chunksize=43 -S -verify-dom-info < %s | FileCheck %s -check-prefix=LIBOMP-IR-STATIC-CHUNKED
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly<no-default-opts>' -polly-omp-backend=LLVM -polly-scheduling=static -S -verify-dom-info < %s | FileCheck %s -check-prefix=LIBOMP-IR-STATIC
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly<no-default-opts>' -polly-omp-backend=LLVM -polly-scheduling=dynamic -S -verify-dom-info < %s | FileCheck %s -check-prefix=LIBOMP-IR-DYNAMIC
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly<no-default-opts>' -polly-omp-backend=LLVM -polly-scheduling=dynamic -polly-scheduling-chunksize=4 -S -verify-dom-info < %s | FileCheck %s -check-prefix=LIBOMP-IR-DYNAMIC-FOUR
; RUN: opt %loadNPMPolly -polly-parallel -polly-parallel-force '-passes=polly-custom<import-jscop;codegen>' -polly-omp-backend=LLVM -S < %s | FileCheck %s -check-prefix=LIBOMP-IR-STRIDE4
; This extensive test case tests the creation of the full set of OpenMP calls
; as well as the subfunction creation using a trivial loop as example.
;
; #define N 1024
; float A[N];
;
; void single_parallel_loop(void) {
; for (long i = 0; i < N; i++)
; A[i] = 1;
; }
; AST: #pragma simd
; AST: #pragma omp parallel for
; AST: for (int c0 = 0; c0 <= 1023; c0 += 1)
; AST: Stmt_S(c0);
; AST-STRIDE4: #pragma omp parallel for
; AST-STRIDE4: for (int c0 = 0; c0 <= 1023; c0 += 4)
; AST-STRIDE4: #pragma simd
; AST-STRIDE4: for (int c1 = c0; c1 <= c0 + 3; c1 += 1)
; AST-STRIDE4: Stmt_S(c1);
; IR-LABEL: single_parallel_loop()
; IR-NEXT: entry
; IR-NEXT: %polly.par.userContext = alloca
; IR-LABEL: polly.parallel.for:
; IR-NEXT: call void @GOMP_parallel_loop_runtime_start(ptr @single_parallel_loop_polly_subfn, ptr %polly.par.userContext, i32 0, i64 0, i64 1024, i64 1)
; IR-NEXT: call void @single_parallel_loop_polly_subfn(ptr %polly.par.userContext)
; IR-NEXT: call void @GOMP_parallel_end()
; IR-NEXT: br label %polly.exiting
; IR: define internal void @single_parallel_loop_polly_subfn(ptr %polly.par.userContext) #1
; IR-LABEL: polly.par.setup:
; IR-NEXT: %polly.par.LBPtr = alloca i64
; IR-NEXT: %polly.par.UBPtr = alloca i64
; IR: br label %polly.par.checkNext
; IR-LABEL: polly.par.exit:
; IR-NEXT: call void @GOMP_loop_end_nowait()
; IR-NEXT: ret void
; IR-LABEL: polly.par.checkNext:
; IR-NEXT: %[[parnext:[._a-zA-Z0-9]*]] = call i8 @GOMP_loop_runtime_next(ptr %polly.par.LBPtr, ptr %polly.par.UBPtr)
; IR-NEXT: %[[cmp:[._a-zA-Z0-9]*]] = icmp ne i8 %[[parnext]], 0
; IR-NEXT: br i1 %[[cmp]], label %polly.par.loadIVBounds, label %polly.par.exit
; IR-LABEL: polly.par.loadIVBounds:
; IR-NEXT: %polly.par.LB = load i64, ptr %polly.par.LBPtr
; IR-NEXT: %polly.par.UB = load i64, ptr %polly.par.UBPtr
; IR-NEXT: %polly.par.UBAdjusted = sub i64 %polly.par.UB, 1
; IR-NEXT: br label %polly.loop_preheader
; IR-LABEL: polly.loop_exit:
; IR-NEXT: br label %polly.par.checkNext
; IR-LABEL: polly.loop_header:
; IR-NEXT: %polly.indvar = phi i64 [ %polly.par.LB, %polly.loop_preheader ], [ %polly.indvar_next, %polly.stmt.S ]
; IR-NEXT: br label %polly.stmt.S
; IR-LABEL: polly.stmt.S:
; IR-NEXT: %[[offset:[0-9]+]] = shl i64 %polly.indvar, 2
; IR-NEXT: %[[gep:[._a-zA-Z0-9]*]] = getelementptr i8, ptr {{.*}}, i64 %[[offset]]
; IR-NEXT: store float 1.000000e+00, ptr %[[gep]]
; IR-NEXT: %polly.indvar_next = add nsw i64 %polly.indvar, 1
; IR-NEXT: %polly.loop_cond = icmp sle i64 %polly.indvar_next, %polly.par.UBAdjusted
; IR-NEXT: br i1 %polly.loop_cond, label %polly.loop_header, label %polly.loop_exit
; IR-LABEL: polly.loop_preheader:
; IR-NEXT: br label %polly.loop_header
; IR: attributes #1 = { "polly.skip.fn" }
; IR-STRIDE4: call void @GOMP_parallel_loop_runtime_start(ptr @single_parallel_loop_polly_subfn, ptr %polly.par.userContext, i32 0, i64 0, i64 1024, i64 4)
; IR-STRIDE4: add nsw i64 %polly.indvar, 3
; IR-STRIDE4: %polly.indvar_next = add nsw i64 %polly.indvar, 4
; IR-STRIDE4 %polly.adjust_ub = sub i64 %polly.par.UBAdjusted, 4
; LIBOMP-IR-STATIC-CHUNKED: %struct.ident_t = type { i32, i32, i32, i32, ptr }
; LIBOMP-IR-STATIC-CHUNKED-LABEL: single_parallel_loop()
; LIBOMP-IR-STATIC-CHUNKED-NEXT: entry
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.userContext = alloca
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.parallel.for:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: call void (ptr, i32, ptr, ...) @__kmpc_fork_call(ptr @.loc.dummy, i32 4, ptr @single_parallel_loop_polly_subfn, i64 0, i64 1024, i64 1, ptr %polly.par.userContext)
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br label %polly.exiting
; LIBOMP-IR-STATIC-CHUNKED: define internal void @single_parallel_loop_polly_subfn(ptr %polly.kmpc.global_tid, ptr %polly.kmpc.bound_tid, i64 %polly.kmpc.lb, i64 %polly.kmpc.ub, i64 %polly.kmpc.inc, ptr %polly.kmpc.shared)
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.par.setup:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.LBPtr = alloca i64
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.UBPtr = alloca i64
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.lastIterPtr = alloca i32
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.StridePtr = alloca i64
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.par.global_tid = load i32, ptr %polly.kmpc.global_tid
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.kmpc.lb, ptr %polly.par.LBPtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.kmpc.ub, ptr %polly.par.UBPtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i32 0, ptr %polly.par.lastIterPtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.kmpc.inc, ptr %polly.par.StridePtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.UBAdjusted = add i64 %polly.kmpc.ub, -1
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.indvar.UBAdjusted, ptr %polly.par.UBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: call void @__kmpc_for_static_init_{{[4|8]}}(ptr @.loc.dummy{{[.0-9]*}}, i32 %polly.par.global_tid, i32 33, ptr %polly.par.lastIterPtr, ptr %polly.par.LBPtr, ptr %polly.par.UBPtr, ptr %polly.par.StridePtr, i64 1, i64 43)
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.kmpc.stride = load i64, ptr %polly.par.StridePtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.LB = load i64, ptr %polly.par.LBPtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.UB.temp = load i64, ptr %polly.par.UBPtr
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.UB.inRange = icmp sle i64 %polly.indvar.UB.temp, %polly.indvar.UBAdjusted
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.UB = select i1 %polly.indvar.UB.inRange, i64 %polly.indvar.UB.temp, i64 %polly.indvar.UBAdjusted
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.indvar.UB, ptr %polly.par.UBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.hasIteration = icmp sle i64 %polly.indvar.LB, %polly.indvar.UB
; LIBOMP-IR-STATIC-CHUNKED: br i1 %polly.hasIteration, label %polly.par.loadIVBounds, label %polly.par.exit
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.par.exit:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: call void @__kmpc_for_static_fini(ptr @.loc.dummy, i32 %polly.par.global_tid)
; LIBOMP-IR-STATIC-CHUNKED-NEXT: ret void
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.par.checkNext:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.nextLB = add i64 %polly.indvar.LB.entry, %polly.kmpc.stride
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %{{[0-9]+}} = add i64 %polly.indvar.UB.entry, %polly.kmpc.stride
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.nextUB.outOfBounds = icmp sgt i64 %{{[0-9]+}}, %polly.indvar.UBAdjusted
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.nextUB = select i1 %polly.indvar.nextUB.outOfBounds, i64 %polly.indvar.UBAdjusted, i64 %{{[0-9]+}}
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.indvar.nextLB, ptr %polly.par.LBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store i64 %polly.indvar.nextUB, ptr %polly.par.UBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.hasWork = icmp sle i64 %polly.indvar.nextLB, %polly.indvar.UBAdjusted
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br i1 %polly.hasWork, label %polly.par.loadIVBounds, label %polly.par.exit
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.par.loadIVBounds:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.LB.entry = load i64, ptr %polly.par.LBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar.UB.entry = load i64, ptr %polly.par.UBPtr, align 8
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br label %polly.loop_preheader
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.loop_exit:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br label %polly.par.checkNext
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.loop_header:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar = phi i64 [ %polly.indvar.LB.entry, %polly.loop_preheader ], [ %polly.indvar_next, %polly.stmt.S ]
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br label %polly.stmt.S
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.stmt.S:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %[[offset:[0-9]+]] = shl i64 %polly.indvar, 2
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %[[gep:[._a-zA-Z0-9]*]] = getelementptr i8, ptr {{.*}}, i64 %[[offset]]
; LIBOMP-IR-STATIC-CHUNKED-NEXT: store float 1.000000e+00, ptr %[[gep]]
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.indvar_next = add nsw i64 %polly.indvar, 1
; LIBOMP-IR-STATIC-CHUNKED-NEXT: %polly.loop_cond = icmp sle i64 %polly.indvar_next, %polly.indvar.UB.entry
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br i1 %polly.loop_cond, label %polly.loop_header, label %polly.loop_exit
; LIBOMP-IR-STATIC-CHUNKED-LABEL: polly.loop_preheader:
; LIBOMP-IR-STATIC-CHUNKED-NEXT: br label %polly.loop_header
; LIBOMP-IR-STATIC-CHUNKED: attributes #1 = { "polly.skip.fn" }
; LIBOMP-IR-STATIC: define internal void @single_parallel_loop_polly_subfn(ptr %polly.kmpc.global_tid, ptr %polly.kmpc.bound_tid, i64 %polly.kmpc.lb, i64 %polly.kmpc.ub, i64 %polly.kmpc.inc, ptr %polly.kmpc.shared)
; LIBOMP-IR-STATIC-LABEL: polly.par.setup:
; LIBOMP-IR-STATIC: call void @__kmpc_for_static_init_{{[4|8]}}(ptr @.loc.dummy{{[.0-9]*}}, i32 %polly.par.global_tid, i32 34, ptr %polly.par.lastIterPtr, ptr %polly.par.LBPtr, ptr %polly.par.UBPtr, ptr %polly.par.StridePtr, i64 1, i64 1)
; LIBOMP-IR-STATIC: br i1 %polly.hasIteration, label %polly.par.loadIVBounds, label %polly.par.exit
; LIBOMP-IR-STATIC-LABEL: polly.par.exit:
; LIBOMP-IR-STATIC-NEXT: call void @__kmpc_for_static_fini(ptr @.loc.dummy, i32 %polly.par.global_tid)
; LIBOMP-IR-STATIC-NEXT: ret void
; LIBOMP-IR-STATIC-LABEL: polly.par.checkNext:
; LIBOMP-IR-STATIC-NEXT: br label %polly.par.exit
; LIBOMP-IR-STATIC-LABEL: polly.par.loadIVBounds:
; LIBOMP-IR-STATIC-NEXT: br label %polly.loop_preheader
; LIBOMP-IR-STATIC-LABEL: polly.loop_exit:
; LIBOMP-IR-STATIC-NEXT: br label %polly.par.checkNext
; LIBOMP-IR-STATIC-LABEL: polly.loop_header:
; LIBOMP-IR-STATIC-NEXT: %polly.indvar = phi i64 [ %polly.indvar.LB, %polly.loop_preheader ], [ %polly.indvar_next, %polly.stmt.S ]
; LIBOMP-IR-STATIC-NEXT: br label %polly.stmt.S
; LIBOMP-IR-STATIC-LABEL: polly.stmt.S:
; LIBOMP-IR-STATIC-NEXT: %[[offset:[0-9]+]] = shl i64 %polly.indvar, 2
; LIBOMP-IR-STATIC-NEXT: %[[gep:[._a-zA-Z0-9]*]] = getelementptr i8, ptr {{.*}}, i64 %[[offset]]
; LIBOMP-IR-STATIC-NEXT: store float 1.000000e+00, ptr %[[gep]]
; LIBOMP-IR-STATIC-NEXT: %polly.indvar_next = add nsw i64 %polly.indvar, 1
; LIBOMP-IR-STATIC-NEXT: %polly.loop_cond = icmp sle i64 %polly.indvar_next, %polly.indvar.UB
; LIBOMP-IR-STATIC-NEXT: br i1 %polly.loop_cond, label %polly.loop_header, label %polly.loop_exit
; LIBOMP-IR-STATIC-LABEL: polly.loop_preheader:
; LIBOMP-IR-STATIC-NEXT: br label %polly.loop_header
; LIBOMP-IR-DYNAMIC: call void @__kmpc_dispatch_init_{{[4|8]}}(ptr @.loc.dummy, i32 %polly.par.global_tid, i32 35, i64 %polly.kmpc.lb, i64 %polly.indvar.UBAdjusted, i64 %polly.kmpc.inc, i64 1)
; LIBOMP-IR-DYNAMIC-NEXT: %{{[0-9]+}} = call i32 @__kmpc_dispatch_next_{{[4|8]}}(ptr @.loc.dummy, i32 %polly.par.global_tid, ptr %polly.par.lastIterPtr, ptr %polly.par.LBPtr, ptr %polly.par.UBPtr, ptr %polly.par.StridePtr)
; LIBOMP-IR-DYNAMIC-NEXT: %polly.hasIteration = icmp eq i32 %{{[0-9]+}}, 1
; LIBOMP-IR-DYNAMIC-NEXT: br i1 %polly.hasIteration, label %polly.par.loadIVBounds, label %polly.par.exit
; LIBOMP-IR-DYNAMIC-LABEL: polly.par.exit:
; LIBOMP-IR-DYNAMIC-NEXT: ret void
; LIBOMP-IR-DYNAMIC-LABEL: polly.par.checkNext:
; LIBOMP-IR-DYNAMIC-NEXT: %{{[0-9]+}} = call i32 @__kmpc_dispatch_next_{{[4|8]}}(ptr @.loc.dummy, i32 %polly.par.global_tid, ptr %polly.par.lastIterPtr, ptr %polly.par.LBPtr, ptr %polly.par.UBPtr, ptr %polly.par.StridePtr)
; LIBOMP-IR-DYNAMIC-NEXT: %polly.hasWork = icmp eq i32 %{{[0-9]+}}, 1
; LIBOMP-IR-DYNAMIC-NEXT: br i1 %polly.hasWork, label %polly.par.loadIVBounds, label %polly.par.exit
; LIBOMP-IR-DYNAMIC-LABEL: polly.par.loadIVBounds:
; LIBOMP-IR-DYNAMIC-NEXT: %polly.indvar.LB = load i64, ptr %polly.par.LBPtr
; LIBOMP-IR-DYNAMIC-NEXT: %polly.indvar.UB = load i64, ptr %polly.par.UBPtr
; LIBOMP-IR-DYNAMIC-NEXT: br label %polly.loop_preheader
; LIBOMP-IR-DYNAMIC-FOUR: call void @__kmpc_dispatch_init_{{[4|8]}}(ptr @.loc.dummy, i32 %polly.par.global_tid, i32 35, i64 %polly.kmpc.lb, i64 %polly.indvar.UBAdjusted, i64 %polly.kmpc.inc, i64 4)
; LIBOMP-IR-STRIDE4: call void (ptr, i32, ptr, ...) @__kmpc_fork_call(ptr @.loc.dummy, i32 4, ptr @single_parallel_loop_polly_subfn, i64 0, i64 1024, i64 4, ptr %polly.par.userContext)
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
@A = common global [1024 x float] zeroinitializer, align 16
define void @single_parallel_loop() nounwind {
entry:
br label %for.i
for.i:
%indvar = phi i64 [ %indvar.next, %for.inc], [ 0, %entry ]
%scevgep = getelementptr [1024 x float], ptr @A, i64 0, i64 %indvar
%exitcond = icmp ne i64 %indvar, 1024
br i1 %exitcond, label %S, label %exit
S:
store float 1.0, ptr %scevgep
br label %for.inc
for.inc:
%indvar.next = add i64 %indvar, 1
br label %for.i
exit:
ret void
}
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