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llvm-project/clang/test/OpenMP/master_taskloop_simd_reduction_codegen.cpp
Alexey Bataev 08029595ca [OPENMP]Fix overflow during counting the number of iterations. 
Summary:
The OpenMP loops are normalized and transformed into the loops from 0 to
max number of iterations. In some cases, original scheme may lead to
overflow during calculation of number of iterations. If it is unknown,
if we can end up with overflow or not (the bounds are not constant and
  we cannot define if there is an overflow), cast original type to the
  unsigned.

Reviewers: jdoerfert

Subscribers: yaxunl, guansong, sstefan1, openmp-commits, cfe-commits, caomhin

Tags: #clang, #openmp

Differential Revision: https://reviews.llvm.org/D81881
2020-06-17 08:47:01 -04:00

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// RUN: %clang_cc1 -fopenmp -x c++ %s -verify -debug-info-kind=limited -emit-llvm -o - -triple powerpc64le-unknown-linux-gnu -std=c++98 -fnoopenmp-use-tls | FileCheck %s
// RUN: %clang_cc1 -fopenmp-simd -x c++ %s -verify -debug-info-kind=limited -emit-llvm -o - -triple powerpc64le-unknown-linux-gnu -std=c++98 -fnoopenmp-use-tls | FileCheck --check-prefix SIMD-ONLY0 %s
// SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
// expected-no-diagnostics
struct S {
float a;
S() : a(0.0f) {}
~S() {}
};
#pragma omp declare reduction(+:S:omp_out.a += omp_in.a) initializer(omp_priv = omp_orig)
float g;
int a;
#pragma omp threadprivate(a)
int main (int argc, char *argv[])
{
int i, n;
float a[100], b[100], sum, e[argc + 100];
S c[100];
float &d = g;
/* Some initializations */
n = 100;
for (i=0; i < n; i++)
a[i] = b[i] = i * 1.0;
sum = 0.0;
#pragma omp master taskloop simd reduction(+:sum, c[:n], d, e)
for (i=0; i < n; i++) {
sum = sum + (a[i] * b[i]);
c[i].a = i*i;
d += i*i;
e[i] = i;
}
}
// CHECK-LABEL: @main(
// CHECK: [[RETVAL:%.*]] = alloca i32,
// CHECK: [[ARGC_ADDR:%.*]] = alloca i32,
// CHECK: [[ARGV_ADDR:%.*]] = alloca i8**,
// CHECK: [[I:%.*]] = alloca i32,
// CHECK: [[N:%.*]] = alloca i32,
// CHECK: [[A:%.*]] = alloca [100 x float],
// CHECK: [[B:%.*]] = alloca [100 x float],
// CHECK: [[SUM:%.*]] = alloca float,
// CHECK: [[SAVED_STACK:%.*]] = alloca i8*,
// CHECK: [[C:%.*]] = alloca [100 x %struct.S],
// CHECK: [[D:%.*]] = alloca float*,
// CHECK: [[AGG_CAPTURED:%.*]] = alloca [[STRUCT_ANON:%.*]],
// CHECK: [[DOTRD_INPUT_:%.*]] = alloca [4 x %struct.kmp_taskred_input_t],
// CHECK: alloca i32,
// CHECK: [[DOTCAPTURE_EXPR_:%.*]] = alloca i32,
// CHECK: [[DOTCAPTURE_EXPR_9:%.*]] = alloca i32,
// CHECK: [[TMP0:%.*]] = call i32 @__kmpc_global_thread_num(%struct.ident_t*
// CHECK: store i32 0, i32* [[RETVAL]],
// CHECK: store i32 [[ARGC:%.*]], i32* [[ARGC_ADDR]],
// CHECK: store i8** [[ARGV:%.*]], i8*** [[ARGV_ADDR]],
// CHECK: [[TMP1:%.*]] = load i32, i32* [[ARGC_ADDR]],
// CHECK: [[ADD:%.*]] = add nsw i32 [[TMP1]], 100
// CHECK: [[TMP2:%.*]] = zext i32 [[ADD]] to i64
// CHECK: [[VLA:%.+]] = alloca float, i64 %
// CHECK: call void @__kmpc_taskgroup(%struct.ident_t*
// CHECK-DAG: [[TMP21:%.*]] = bitcast float* [[SUM]] to i8*
// CHECK-DAG: store i8* [[TMP21]], i8** [[TMP20:%[^,]+]],
// CHECK-DAG: [[TMP20]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_:%.+]], i32 0, i32 0
// CHECK-DAG: [[TMP21:%.*]] = bitcast float* [[SUM]] to i8*
// CHECK-DAG: store i8* [[TMP21]], i8** [[TMP20:%[^,]+]],
// CHECK-DAG: [[TMP20]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_:%.+]], i32 0, i32 1
// CHECK-DAG: [[TMP22:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_]], i32 0, i32 2
// CHECK-DAG: store i64 4, i64* [[TMP22]],
// CHECK-DAG: [[TMP23:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_]], i32 0, i32 3
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_INIT1:.+]] to i8*), i8** [[TMP23]],
// CHECK-DAG: [[TMP24:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_]], i32 0, i32 4
// CHECK-DAG: store i8* null, i8** [[TMP24]],
// CHECK-DAG: [[TMP25:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_]], i32 0, i32 5
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_COMB1:.+]] to i8*), i8** [[TMP25]],
// CHECK-DAG: [[TMP26:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_]], i32 0, i32 6
// CHECK-DAG: [[TMP27:%.*]] = bitcast i32* [[TMP26]] to i8*
// CHECK-DAG: call void @llvm.memset.p0i8.i64(i8* align 8 [[TMP27]], i8 0, i64 4, i1 false)
// CHECK-DAG: [[ARRAYIDX5:%.*]] = getelementptr inbounds [100 x %struct.S], [100 x %struct.S]* [[C]], i64 0, i64 0
// CHECK-DAG: [[LB_ADD_LEN:%.*]] = add nsw i64 -1, %
// CHECK-DAG: [[ARRAYIDX6:%.*]] = getelementptr inbounds [100 x %struct.S], [100 x %struct.S]* [[C]], i64 0, i64 [[LB_ADD_LEN]]
// CHECK-DAG: [[TMP31:%.*]] = bitcast %struct.S* [[ARRAYIDX5]] to i8*
// CHECK-DAG: store i8* [[TMP31]], i8** [[TMP28:%[^,]+]],
// CHECK-DAG: [[TMP28]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4:%.+]], i32 0, i32 0
// CHECK-DAG: [[TMP31:%.*]] = bitcast %struct.S* [[ARRAYIDX5]] to i8*
// CHECK-DAG: store i8* [[TMP31]], i8** [[TMP28:%[^,]+]],
// CHECK-DAG: [[TMP28]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4:%.+]], i32 0, i32 1
// CHECK-DAG: [[TMP32:%.*]] = ptrtoint %struct.S* [[ARRAYIDX6]] to i64
// CHECK-DAG: [[TMP33:%.*]] = ptrtoint %struct.S* [[ARRAYIDX5]] to i64
// CHECK-DAG: [[TMP34:%.*]] = sub i64 [[TMP32]], [[TMP33]]
// CHECK-DAG: [[TMP35:%.*]] = sdiv exact i64 [[TMP34]], ptrtoint (float* getelementptr (float, float* null, i32 1) to i64)
// CHECK-DAG: [[TMP36:%.*]] = add nuw i64 [[TMP35]], 1
// CHECK-DAG: [[TMP37:%.*]] = mul nuw i64 [[TMP36]], ptrtoint (float* getelementptr (float, float* null, i32 1) to i64)
// CHECK-DAG: store i64 [[TMP37]], i64* [[TMP38:%[^,]+]],
// CHECK-DAG: [[TMP38]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4]], i32 0, i32 2
// CHECK-DAG: [[TMP39:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4]], i32 0, i32 3
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_INIT2:.+]] to i8*), i8** [[TMP39]],
// CHECK-DAG: [[TMP40:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4]], i32 0, i32 4
// CHECK-DAG: store i8* bitcast (void (i8*)* @[[RED_FINI2:.+]] to i8*), i8** [[TMP40]],
// CHECK-DAG: [[TMP41:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4]], i32 0, i32 5
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_COMB2:.+]] to i8*), i8** [[TMP41]],
// CHECK-DAG: [[TMP42:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_4]], i32 0, i32 6
// CHECK-DAG: store i32 1, i32* [[TMP42]],
// CHECK-DAG: [[TMP44:%.*]] = load float*, float** [[D]],
// CHECK-DAG: [[TMP45:%.*]] = bitcast float* [[TMP44]] to i8*
// CHECK-DAG: store i8* [[TMP45]], i8** [[TMP43:%[^,]+]],
// CHECK-DAG: [[TMP43]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7:%.+]], i32 0, i32 0
// CHECK-DAG: [[TMP45:%.*]] = bitcast float* [[TMP44]] to i8*
// CHECK-DAG: store i8* [[TMP45]], i8** [[TMP43:%[^,]+]],
// CHECK-DAG: [[TMP43]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7:%.+]], i32 0, i32 1
// CHECK-DAG: [[TMP46:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7]], i32 0, i32 2
// CHECK-DAG: store i64 4, i64* [[TMP46]],
// CHECK-DAG: [[TMP47:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7]], i32 0, i32 3
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_INIT3:.+]] to i8*), i8** [[TMP47]],
// CHECK-DAG: [[TMP48:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7]], i32 0, i32 4
// CHECK-DAG: store i8* null, i8** [[TMP48]],
// CHECK-DAG: [[TMP49:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7]], i32 0, i32 5
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_COMB3:.+]] to i8*), i8** [[TMP49]],
// CHECK-DAG: [[TMP50:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_7]], i32 0, i32 6
// CHECK-DAG: [[TMP51:%.*]] = bitcast i32* [[TMP50]] to i8*
// CHECK-DAG: call void @llvm.memset.p0i8.i64(i8* align 8 [[TMP51]], i8 0, i64 4, i1 false)
// CHECK-DAG: [[TMP53:%.*]] = bitcast float* [[VLA]] to i8*
// CHECK-DAG: store i8* [[TMP53]], i8** [[TMP52:%[^,]+]],
// CHECK-DAG: [[TMP52]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8:%.+]], i32 0, i32 0
// CHECK-DAG: [[TMP53:%.*]] = bitcast float* [[VLA]] to i8*
// CHECK-DAG: store i8* [[TMP53]], i8** [[TMP52:%[^,]+]],
// CHECK-DAG: [[TMP52]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8:%.+]], i32 0, i32 1
// CHECK-DAG: [[TMP54:%.*]] = mul nuw i64 [[TMP2]], 4
// CHECK-DAG: [[TMP55:%.*]] = udiv exact i64 [[TMP54]], ptrtoint (float* getelementptr (float, float* null, i32 1) to i64)
// CHECK-DAG: store i64 [[TMP54]], i64* [[TMP56:%[^,]+]],
// CHECK-DAG: [[TMP56]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8]], i32 0, i32 2
// CHECK-DAG: [[TMP57:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8]], i32 0, i32 3
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_INIT4:.+]] to i8*), i8** [[TMP57]],
// CHECK-DAG: [[TMP58:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8]], i32 0, i32 4
// CHECK-DAG: store i8* null, i8** [[TMP58]],
// CHECK-DAG: [[TMP59:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8]], i32 0, i32 5
// CHECK-DAG: store i8* bitcast (void (i8*, i8*)* @[[RED_COMB4:.+]] to i8*), i8** [[TMP59]],
// CHECK-DAG: [[TMP60:%.*]] = getelementptr inbounds %struct.kmp_taskred_input_t, %struct.kmp_taskred_input_t* [[DOTRD_INPUT_GEP_8]], i32 0, i32 6
// CHECK-DAG: store i32 1, i32* [[TMP60]],
// CHECK-DAG: [[DOTRD_INPUT_GEP_]] = getelementptr inbounds [4 x %struct.kmp_taskred_input_t], [4 x %struct.kmp_taskred_input_t]* [[DOTRD_INPUT_]], i64 0, i64
// CHECK-DAG: [[DOTRD_INPUT_GEP_4]] = getelementptr inbounds [4 x %struct.kmp_taskred_input_t], [4 x %struct.kmp_taskred_input_t]* [[DOTRD_INPUT_]], i64 0, i64
// CHECK-DAG: [[DOTRD_INPUT_GEP_7]] = getelementptr inbounds [4 x %struct.kmp_taskred_input_t], [4 x %struct.kmp_taskred_input_t]* [[DOTRD_INPUT_]], i64 0, i64
// CHECK-DAG: [[DOTRD_INPUT_GEP_8]] = getelementptr inbounds [4 x %struct.kmp_taskred_input_t], [4 x %struct.kmp_taskred_input_t]* [[DOTRD_INPUT_]], i64 0, i64
// CHECK: [[TMP61:%.*]] = bitcast [4 x %struct.kmp_taskred_input_t]* [[DOTRD_INPUT_]] to i8*
// CHECK: [[TMP62:%.*]] = call i8* @__kmpc_taskred_init(i32 [[TMP0]], i32 4, i8* [[TMP61]])
// CHECK: [[TMP63:%.*]] = load i32, i32* [[N]],
// CHECK: store i32 [[TMP63]], i32* [[DOTCAPTURE_EXPR_]],
// CHECK: [[TMP64:%.*]] = load i32, i32* [[DOTCAPTURE_EXPR_]],
// CHECK: [[SUB:%.*]] = sub nsw i32 [[TMP64]], 0
// CHECK: [[DIV:%.*]] = sdiv i32 [[SUB]], 1
// CHECK: [[SUB12:%.*]] = sub nsw i32 [[DIV]], 1
// CHECK: store i32 [[SUB12]], i32* [[DOTCAPTURE_EXPR_9]],
// CHECK: [[TMP65:%.*]] = call i8* @__kmpc_omp_task_alloc(%struct.ident_t* %{{.+}}, i32 [[TMP0]], i32 1, i64 888, i64 40, i32 (i32, i8*)* bitcast (i32 (i32, %struct.kmp_task_t_with_privates*)* @{{.+}} to i32 (i32, i8*)*))
// CHECK: call void @__kmpc_taskloop(%struct.ident_t* %{{.+}}, i32 [[TMP0]], i8* [[TMP65]], i32 1, i64* %{{.+}}, i64* %{{.+}}, i64 %{{.+}}, i32 1, i32 0, i64 0, i8* null)
// CHECK: call void @__kmpc_end_taskgroup(%struct.ident_t*
// CHECK: ret i32
// CHECK: define internal void @[[RED_INIT1]](i8* noalias %{{.+}}, i8* noalias %{{.+}})
// CHECK: store float 0.000000e+00, float* %
// CHECK: ret void
// CHECK: define internal void @[[RED_COMB1]](i8* %0, i8* %1)
// CHECK: fadd float %
// CHECK: store float %{{.+}}, float* %
// CHECK: ret void
// CHECK: define internal void @[[RED_INIT2]](i8* noalias %{{.+}}, i8* noalias %{{.+}})
// CHECK: call i8* @__kmpc_threadprivate_cached(
// CHECK: call void [[OMP_INIT1:@.+]](
// CHECK: ret void
// CHECK: define internal void [[OMP_COMB1:@.+]](%struct.S* noalias %0, %struct.S* noalias %1)
// CHECK: fadd float %
// CHECK: define internal void [[OMP_INIT1]](%struct.S* noalias %0, %struct.S* noalias %1)
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(
// CHECK: define internal void @[[RED_FINI2]](i8* %0)
// CHECK: call i8* @__kmpc_threadprivate_cached(
// CHECK: call void @
// CHECK: ret void
// CHECK: define internal void @[[RED_COMB2]](i8* %0, i8* %1)
// CHECK: call i8* @__kmpc_threadprivate_cached(
// CHECK: call void [[OMP_COMB1]](
// CHECK: ret void
// CHECK: define internal void @[[RED_INIT3]](i8* noalias %{{.+}}, i8* noalias %{{.+}})
// CHECK: store float 0.000000e+00, float* %
// CHECK: ret void
// CHECK: define internal void @[[RED_COMB3]](i8* %0, i8* %1)
// CHECK: fadd float %
// CHECK: store float %{{.+}}, float* %
// CHECK: ret void
// CHECK: define internal void @[[RED_INIT4]](i8* noalias %{{.+}}, i8* noalias %{{.+}})
// CHECK: call i8* @__kmpc_threadprivate_cached(
// CHECK: store float 0.000000e+00, float* %
// CHECK: ret void
// CHECK: define internal void @[[RED_COMB4]](i8* %0, i8* %1)
// CHECK: call i8* @__kmpc_threadprivate_cached(
// CHECK: fadd float %
// CHECK: store float %{{.+}}, float* %
// CHECK: ret void
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_INIT1]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_COMB1]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_INIT2]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_FINI2]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_COMB2]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_INIT3]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_COMB3]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_INIT4]]"
// CHECK-DAG: !DISubprogram(linkageName: "[[RED_COMB4]]"
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