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[OpenMP][Opt] Delete terminating and read-only parallel regions
Parallel regions known to be read-only, e.g., after we removed all dead write accesses, and terminating (`willreturn`) can be removed. Reviewed By: JonChesterfield Differential Revision: https://reviews.llvm.org/D69954
This commit is contained in:
Johannes Doerfert
parent
dd0a5d8390
commit
681051992b
@ -111,11 +111,47 @@ struct OpenMPOpt {
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<< " functions\n");
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Changed |= deduplicateRuntimeCalls();
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Changed |= deleteParallelRegions();
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return Changed;
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}
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private:
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/// Try to delete parallel regions if possible
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bool deleteParallelRegions() {
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const unsigned CallbackCalleeOperand = 2;
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RuntimeFunctionInfo &RFI = RFIs[OMPRTL___kmpc_fork_call];
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if (!RFI.Declaration)
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return false;
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bool Changed = false;
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auto DeleteCallCB = [&](Use &U, Function &) {
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CallInst *CI = getCallIfRegularCall(U);
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if (!CI)
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return false;
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auto *Fn = dyn_cast<Function>(
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CI->getArgOperand(CallbackCalleeOperand)->stripPointerCasts());
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if (!Fn)
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return false;
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if (!Fn->onlyReadsMemory())
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return false;
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if (!Fn->hasFnAttribute(Attribute::WillReturn))
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return false;
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LLVM_DEBUG(dbgs() << TAG << "Delete read-only parallel region in "
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<< CI->getCaller()->getName() << "\n");
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CGUpdater.removeCallSite(*CI);
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CI->eraseFromParent();
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Changed = true;
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return true;
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};
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RFI.foreachUse(DeleteCallCB);
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return Changed;
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}
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/// Try to eliminiate runtime calls by reusing existing ones.
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bool deduplicateRuntimeCalls() {
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bool Changed = false;
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309
test/Transforms/OpenMP/parallel_deletion.ll
Normal file
309
test/Transforms/OpenMP/parallel_deletion.ll
Normal file
@ -0,0 +1,309 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -attributor -openmpopt -attributor-disable=false < %s | FileCheck %s
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; RUN: opt -S -passes='attributor,cgscc(openmpopt)' -attributor-disable=false < %s | FileCheck %s
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;
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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%struct.ident_t = type { i32, i32, i32, i32, i8* }
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@.str = private unnamed_addr constant [23 x i8] c";unknown;unknown;0;0;;\00", align 1
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@0 = private unnamed_addr global %struct.ident_t { i32 0, i32 2, i32 0, i32 0, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i32 0, i32 0) }, align 8
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@1 = private unnamed_addr global %struct.ident_t { i32 0, i32 322, i32 0, i32 0, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i32 0, i32 0) }, align 8
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@.gomp_critical_user_.reduction.var = common global [8 x i32] zeroinitializer
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@2 = private unnamed_addr global %struct.ident_t { i32 0, i32 18, i32 0, i32 0, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i32 0, i32 0) }, align 8
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; void delete_parallel_0(void) {
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; #pragma omp parallel
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; { unknown_willreturn(); }
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; #pragma omp parallel
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; { readonly_willreturn(); }
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; #pragma omp parallel
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; { readnone_willreturn(); }
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; #pragma omp parallel
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; {}
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; }
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;
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; We delete all but the first of the parallel regions in this test.
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define void @delete_parallel_0() {
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; CHECK-LABEL: define {{[^@]+}}@delete_parallel_0()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 0, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*)* @.omp_outlined.willreturn to void (i32*, i32*, ...)*))
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; CHECK-NEXT: ret void
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;
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entry:
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined.willreturn to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined.willreturn.0 to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined.willreturn.1 to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined.willreturn.2 to void (i32*, i32*, ...)*))
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ret void
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}
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define internal void @.omp_outlined.willreturn(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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call void @unknown() willreturn
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ret void
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}
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define internal void @.omp_outlined.willreturn.0(i32* noalias %.global_tid., i32* noalias %.bound_tid.) willreturn {
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entry:
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call void @readonly()
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ret void
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}
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define internal void @.omp_outlined.willreturn.1(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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call void @readnone() willreturn
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ret void
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}
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define internal void @.omp_outlined.willreturn.2(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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ret void
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}
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; void delete_parallel_1(void) {
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; #pragma omp parallel
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; { unknown(); }
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; #pragma omp parallel
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; { readonly(); }
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; #pragma omp parallel
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; { readnone(); }
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; #pragma omp parallel
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; {}
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; }
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;
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; We delete only the last parallel regions in this test because the others might not return.
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define void @delete_parallel_1() {
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; CHECK-LABEL: define {{[^@]+}}@delete_parallel_1()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 0, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*)* @.omp_outlined. to void (i32*, i32*, ...)*))
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 0, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*)* @.omp_outlined..0 to void (i32*, i32*, ...)*))
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 0, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*)* @.omp_outlined..1 to void (i32*, i32*, ...)*))
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; CHECK-NEXT: ret void
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;
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entry:
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined. to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined..0 to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined..1 to void (i32*, i32*, ...)*))
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 0, void (i32*, i32*, ...)* bitcast (void (i32*, i32*)* @.omp_outlined..2 to void (i32*, i32*, ...)*))
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ret void
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}
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define internal void @.omp_outlined.(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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call void @unknown()
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ret void
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}
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define internal void @.omp_outlined..0(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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call void @readonly()
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ret void
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}
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define internal void @.omp_outlined..1(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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call void @readnone()
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ret void
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}
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define internal void @.omp_outlined..2(i32* noalias %.global_tid., i32* noalias %.bound_tid.) {
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entry:
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ret void
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}
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; void delete_parallel_2(void) {
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; int a = 0;
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; #pragma omp parallel
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; {
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; if (omp_get_thread_num() == 0)
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; ++a;
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; }
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; #pragma omp parallel
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; {
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; #pragma omp master
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; ++a;
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; }
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; #pragma omp parallel
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; {
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; #pragma omp single
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; ++a;
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; }
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; #pragma omp parallel reduction(+: a)
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; {
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; ++a;
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; }
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; }
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;
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; FIXME: We do not realize that `a` is dead and all accesses to it can be removed
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; making the parallel regions readonly and deletable.
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define void @delete_parallel_2() {
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; CHECK-LABEL: define {{[^@]+}}@delete_parallel_2()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[TMP:%.*]] = bitcast i32* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull align 4 dereferenceable(4) [[TMP]])
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; CHECK-NEXT: store i32 0, i32* [[A]], align 4
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 1, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*, i32*)* @.omp_outlined..3 to void (i32*, i32*, ...)*), i32* nocapture nofree nonnull align 4 dereferenceable(4) [[A]])
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 1, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*, i32*)* @.omp_outlined..4 to void (i32*, i32*, ...)*), i32* nocapture nonnull align 4 dereferenceable(4) [[A]])
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 1, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*, i32*)* @.omp_outlined..5 to void (i32*, i32*, ...)*), i32* nocapture nonnull align 4 dereferenceable(4) [[A]])
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; CHECK-NEXT: call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull align 8 dereferenceable(24) @0, i32 1, void (i32*, i32*, ...)* nonnull bitcast (void (i32*, i32*, i32*)* @.omp_outlined..6 to void (i32*, i32*, ...)*), i32* nocapture nonnull align 4 dereferenceable(4) [[A]])
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast i32* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull [[TMP1]])
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; CHECK-NEXT: ret void
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;
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entry:
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%a = alloca i32, align 4
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%tmp = bitcast i32* %a to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
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store i32 0, i32* %a, align 4
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 1, void (i32*, i32*, ...)* bitcast (void (i32*, i32*, i32*)* @.omp_outlined..3 to void (i32*, i32*, ...)*), i32* nonnull %a)
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 1, void (i32*, i32*, ...)* bitcast (void (i32*, i32*, i32*)* @.omp_outlined..4 to void (i32*, i32*, ...)*), i32* nonnull %a)
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 1, void (i32*, i32*, ...)* bitcast (void (i32*, i32*, i32*)* @.omp_outlined..5 to void (i32*, i32*, ...)*), i32* nonnull %a)
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call void (%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(%struct.ident_t* nonnull @0, i32 1, void (i32*, i32*, ...)* bitcast (void (i32*, i32*, i32*)* @.omp_outlined..6 to void (i32*, i32*, ...)*), i32* nonnull %a)
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%tmp1 = bitcast i32* %a to i8*
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %tmp1)
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ret void
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}
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define internal void @.omp_outlined..3(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
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entry:
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%call = call i32 @omp_get_thread_num()
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%cmp = icmp eq i32 %call, 0
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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%tmp = load i32, i32* %a, align 4
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%inc = add nsw i32 %tmp, 1
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store i32 %inc, i32* %a, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret void
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}
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define internal void @.omp_outlined..4(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
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entry:
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%tmp = load i32, i32* %.global_tid., align 4
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%tmp1 = call i32 @__kmpc_master(%struct.ident_t* nonnull @0, i32 %tmp)
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%tmp2 = icmp eq i32 %tmp1, 0
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br i1 %tmp2, label %omp_if.end, label %omp_if.then
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omp_if.then: ; preds = %entry
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%tmp3 = load i32, i32* %a, align 4
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%inc = add nsw i32 %tmp3, 1
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store i32 %inc, i32* %a, align 4
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call void @__kmpc_end_master(%struct.ident_t* nonnull @0, i32 %tmp)
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br label %omp_if.end
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omp_if.end: ; preds = %entry, %omp_if.then
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ret void
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}
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare i32 @omp_get_thread_num() inaccessiblememonly nofree nosync nounwind readonly
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declare i32 @__kmpc_master(%struct.ident_t*, i32)
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declare void @__kmpc_end_master(%struct.ident_t*, i32)
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define internal void @.omp_outlined..5(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
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entry:
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%omp_global_thread_num = call i32 @__kmpc_global_thread_num(%struct.ident_t* nonnull @0)
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%tmp = load i32, i32* %.global_tid., align 4
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%tmp1 = call i32 @__kmpc_single(%struct.ident_t* nonnull @0, i32 %tmp)
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%tmp2 = icmp eq i32 %tmp1, 0
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br i1 %tmp2, label %omp_if.end, label %omp_if.then
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omp_if.then: ; preds = %entry
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%tmp3 = load i32, i32* %a, align 4
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%inc = add nsw i32 %tmp3, 1
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store i32 %inc, i32* %a, align 4
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call void @__kmpc_end_single(%struct.ident_t* nonnull @0, i32 %tmp)
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br label %omp_if.end
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omp_if.end: ; preds = %entry, %omp_if.then
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call void @__kmpc_barrier(%struct.ident_t* nonnull @1, i32 %omp_global_thread_num) #6
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ret void
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}
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define internal void @.omp_outlined..6(i32* noalias %.global_tid., i32* noalias %.bound_tid., i32* dereferenceable(4) %a) {
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entry:
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%a1 = alloca i32, align 4
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%.omp.reduction.red_list = alloca [1 x i8*], align 8
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%tmp = bitcast i32* %a1 to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
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store i32 1, i32* %a1, align 4
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%tmp1 = bitcast [1 x i8*]* %.omp.reduction.red_list to i32**
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store i32* %a1, i32** %tmp1, align 8
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%tmp2 = load i32, i32* %.global_tid., align 4
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%tmp3 = bitcast [1 x i8*]* %.omp.reduction.red_list to i8*
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%tmp4 = call i32 @__kmpc_reduce_nowait(%struct.ident_t* nonnull @2, i32 %tmp2, i32 1, i64 8, i8* nonnull %tmp3, void (i8*, i8*)* nonnull @.omp.reduction.reduction_func, [8 x i32]* nonnull @.gomp_critical_user_.reduction.var)
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switch i32 %tmp4, label %.omp.reduction.default [
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i32 1, label %.omp.reduction.case1
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i32 2, label %.omp.reduction.case2
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]
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.omp.reduction.case1: ; preds = %entry
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%tmp5 = load i32, i32* %a, align 4
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%tmp6 = load i32, i32* %a1, align 4
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%add = add nsw i32 %tmp5, %tmp6
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store i32 %add, i32* %a, align 4
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call void @__kmpc_end_reduce_nowait(%struct.ident_t* nonnull @2, i32 %tmp2, [8 x i32]* nonnull @.gomp_critical_user_.reduction.var)
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br label %.omp.reduction.default
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.omp.reduction.case2: ; preds = %entry
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%tmp7 = load i32, i32* %a1, align 4
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%tmp8 = atomicrmw add i32* %a, i32 %tmp7 monotonic
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br label %.omp.reduction.default
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.omp.reduction.default: ; preds = %.omp.reduction.case2, %.omp.reduction.case1, %entry
|
||||
%tmp9 = bitcast i32* %a1 to i8*
|
||||
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %tmp9)
|
||||
ret void
|
||||
}
|
||||
|
||||
define internal void @.omp.reduction.reduction_func(i8* %arg, i8* %arg1) {
|
||||
entry:
|
||||
%tmp = bitcast i8* %arg1 to i32**
|
||||
%tmp2 = load i32*, i32** %tmp, align 8
|
||||
%tmp3 = bitcast i8* %arg to i32**
|
||||
%tmp4 = load i32*, i32** %tmp3, align 8
|
||||
%tmp5 = load i32, i32* %tmp4, align 4
|
||||
%tmp6 = load i32, i32* %tmp2, align 4
|
||||
%add = add nsw i32 %tmp5, %tmp6
|
||||
store i32 %add, i32* %tmp4, align 4
|
||||
ret void
|
||||
}
|
||||
|
||||
declare i32 @__kmpc_single(%struct.ident_t*, i32)
|
||||
|
||||
declare void @__kmpc_end_single(%struct.ident_t*, i32)
|
||||
|
||||
declare void @__kmpc_barrier(%struct.ident_t*, i32)
|
||||
|
||||
declare i32 @__kmpc_global_thread_num(%struct.ident_t*) nofree nosync nounwind readonly
|
||||
|
||||
declare i32 @__kmpc_reduce_nowait(%struct.ident_t*, i32, i32, i64, i8*, void (i8*, i8*)*, [8 x i32]*)
|
||||
|
||||
declare void @__kmpc_end_reduce_nowait(%struct.ident_t*, i32, [8 x i32]*)
|
||||
|
||||
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
|
||||
|
||||
declare !callback !2 void @__kmpc_fork_call(%struct.ident_t*, i32, void (i32*, i32*, ...)*, ...)
|
||||
|
||||
declare void @unknown()
|
||||
|
||||
declare void @readonly() readonly
|
||||
|
||||
declare void @readnone() readnone
|
||||
|
||||
!0 = !{i32 1, !"wchar_size", i32 4}
|
||||
!1 = !{!"clang"}
|
||||
!2 = !{!3}
|
||||
!3 = !{i64 2, i64 -1, i64 -1, i1 true}
|
||||
!4 = !{!5, !5, i64 0}
|
||||
!5 = !{!"int", !6, i64 0}
|
||||
!6 = !{!"omnipotent char", !7, i64 0}
|
||||
!7 = !{!"Simple C/C++ TBAA"}
|
||||
Loading…
Reference in New Issue
Block a user