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clang-p2996/clang/test/OpenMP/for_simd_reduction_messages.cpp
CHANDRA GHALE afbcf9529a [OpenMP 6.0 ]Codegen for Reduction over private variables with reduction clause (#134709) 
Codegen support for reduction over private variable with reduction
clause. Section 7.6.10 in in OpenMP 6.0 spec.
- An internal shared copy is initialized with an initializer value.
- The shared copy is updated by combining its value with the values from
the private copies created by the clause.
- Once an encountering thread verifies that all updates are complete,
its original list item is updated by merging its value with that of the
shared copy and then broadcast to all threads.

Sample Test Case from OpenMP 6.0 Example 
```
#include <assert.h>
#include <omp.h>
#define N 10

void do_red(int n, int *v, int &sum_v)
{
    sum_v = 0; // sum_v is private
    #pragma omp for reduction(original(private),+: sum_v)
    for (int i = 0; i < n; i++) 
    {
        sum_v += v[i];
    }
}

int main(void)
{
    int v[N];
    for (int i = 0; i < N; i++)
        v[i] = i;
    #pragma omp parallel num_threads(4)
    {
        int s_v; // s_v is private
        do_red(N, v, s_v);
        assert(s_v == 45);
    }
    return 0;
}
```
Expected Codegen:
```
 // A shared global/static variable is introduced for the reduction result.
 // This variable is initialized (e.g., using memset or a UDR initializer)
 // e.g., .omp.reduction.internal_private_var

 // Barrier before any thread performs combination
  call void @__kmpc_barrier(...)

 // Initialization block (executed by thread 0)
 // e.g., call void @llvm.memset.p0.i64(...) or call @udr_initializer(...)

  call void @__kmpc_critical(...)
    // Inside critical section:
    // Load the current value from the shared variable
    // Load the thread-local private variable's value
    // Perform the reduction operation 
    // Store the result back to the shared variable

  call void @__kmpc_end_critical(...)
  // Barrier after all threads complete their combinations

  call void @__kmpc_barrier(...)
 // Broadcast phase:
 // Load the final result from the shared variable)
 // Store the final result to the original private variable in each thread
 // Final barrier after broadcast

  call void @__kmpc_barrier(...)
```

---------

Co-authored-by: Chandra Ghale <ghale@pe31.hpc.amslabs.hpecorp.net>
2025-06-11 14:01:31 +05:30

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// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp -fopenmp-version=45 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp -fopenmp-version=45 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp -fopenmp-version=45 -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp -fopenmp-version=52 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp -fopenmp-version=52 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp -fopenmp-version=52 -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp -fopenmp-version=60 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp -fopenmp-version=60 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp -fopenmp-version=60 -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-simd -fopenmp-version=45 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-simd -fopenmp-version=45 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-simd -fopenmp-version=45 -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-simd %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-simd -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-simd -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp-simd -fopenmp-version=52 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp-simd -fopenmp-version=52 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp52 -fopenmp-simd -fopenmp-version=52 -std=c++11 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp-simd -fopenmp-version=60 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp-simd -fopenmp-version=60 -std=c++98 %s -Wuninitialized
// RUN: %clang_cc1 -verify=expected,omp60 -fopenmp-simd -fopenmp-version=60 -std=c++11 %s -Wuninitialized
extern int omp_default_mem_alloc;
void xxx(int argc) {
int fp; // expected-note {{initialize the variable 'fp' to silence this warning}}
#pragma omp parallel
#pragma omp for simd reduction(+:fp) // expected-warning {{variable 'fp' is uninitialized when used here}}
for (int i = 0; i < 10; ++i)
;
}
void foo() {
}
bool foobool(int argc) {
return argc;
}
void foobar(int &ref) {
#pragma omp parallel
#pragma omp for simd reduction(+:ref)
for (int i = 0; i < 10; ++i)
foo();
}
struct S1; // expected-note {{declared here}} expected-note 4 {{forward declaration of 'S1'}}
extern S1 a;
class S2 {
mutable int a;
S2 &operator+(const S2 &arg) { return (*this); } // expected-note 3 {{implicitly declared private here}}
public:
S2() : a(0) {}
S2(S2 &s2) : a(s2.a) {}
static float S2s; // expected-note 2 {{static data member is predetermined as shared}}
static const float S2sc; // expected-note 2 {{'S2sc' declared here}}
};
const float S2::S2sc = 0;
S2 b; // expected-note 3 {{'b' defined here}}
const S2 ba[5]; // expected-note 2 {{'ba' defined here}}
class S3 {
int a;
public:
int b;
S3() : a(0) {}
S3(const S3 &s3) : a(s3.a) {}
S3 operator+(const S3 &arg1) { return arg1; }
};
int operator+(const S3 &arg1, const S3 &arg2) { return 5; }
S3 c; // expected-note 3 {{'c' defined here}}
const S3 ca[5]; // expected-note 2 {{'ca' defined here}}
extern const int f; // expected-note 4 {{'f' declared here}}
class S4 {
int a;
S4(); // expected-note {{implicitly declared private here}}
S4(const S4 &s4);
S4 &operator+(const S4 &arg) { return (*this); }
public:
S4(int v) : a(v) {}
};
S4 &operator&=(S4 &arg1, S4 &arg2) { return arg1; }
class S5 {
int a;
S5() : a(0) {} // expected-note {{implicitly declared private here}}
S5(const S5 &s5) : a(s5.a) {}
S5 &operator+(const S5 &arg);
public:
S5(int v) : a(v) {}
};
class S6 { // expected-note 3 {{candidate function (the implicit copy assignment operator) not viable: no known conversion from 'int' to 'const S6' for 1st argument}}
#if __cplusplus >= 201103L // C++11 or later
// expected-note@-2 3 {{candidate function (the implicit move assignment operator) not viable}}
#endif
int a;
public:
S6() : a(6) {}
operator int() { return 6; }
} o;
S3 h, k;
#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
template <class T> // expected-note {{declared here}}
T tmain(T argc) {
const T d = T(); // expected-note 4 {{'d' defined here}}
const T da[5] = {T()}; // expected-note 2 {{'da' defined here}}
T qa[5] = {T()};
T i, z;
T &j = i; // expected-note 4 {{'j' defined here}}
S3 &p = k; // expected-note 2 {{'p' defined here}}
const T &r = da[(int)i]; // expected-note 2 {{'r' defined here}}
T &q = qa[(int)i]; // expected-note 2 {{'q' defined here}}
T fl;
#pragma omp parallel
#pragma omp for simd reduction // expected-error {{expected '(' after 'reduction'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction + // expected-error {{expected '(' after 'reduction'}} expected-warning {{extra tokens at the end of '#pragma omp for simd' are ignored}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction( // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(- // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction() // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(*) // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected expression}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(\) // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(& : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(|| : argc ? i : argc) // expected-error 2 {{expected variable name, array element or array section}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(foo : argc) //omp45-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'float'}} omp45-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'int'}} omp50-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'float'}} omp50-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'int'}} omp52-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'float'}} omp52-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'int'}} omp60-error {{incorrect reduction identifier, expected one of '+', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'float'}} omp60-error {{incorrect reduction identifier, expected one of '+', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'int'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : argc) allocate , allocate(, allocate(omp_default , allocate(omp_default_mem_alloc, allocate(omp_default_mem_alloc:, allocate(omp_default_mem_alloc: argc, allocate(omp_default_mem_alloc: argv), allocate(argv) // expected-error {{expected '(' after 'allocate'}} expected-error 2 {{expected expression}} expected-error 2 {{expected ')'}} expected-error {{use of undeclared identifier 'omp_default'}} expected-note 2 {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(^ : T) // expected-error {{'T' does not refer to a value}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : z, a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 3 {{const-qualified variable cannot be reduction}} expected-error 2 {{'operator+' is a private member of 'S2'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(min : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 4 {{arguments of OpenMP clause 'reduction' for 'min' or 'max' must be of arithmetic type}} expected-error 3 {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(max : h.b) // expected-error {{expected variable name, array element or array section}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : ba) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(* : ca) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(- : da) // expected-error 2 {{const-qualified variable cannot be reduction}} omp52-warning 3 {{minus(-) operator for reductions is deprecated; use + or user defined reduction instead}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(^ : fl) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : S2::S2s) // expected-error {{shared variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : S2::S2sc) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : h, k) // expected-error {{threadprivate or thread local variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : o) // expected-error 2 {{no viable overloaded '='}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd private(i), reduction(+ : j), reduction(+ : q) // expected-error 4 {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel private(k)
#pragma omp for simd reduction(+ : p), reduction(+ : p) // expected-error 2 {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : p), reduction(+ : p) // expected-error 2 {{variable can appear only once in OpenMP 'reduction' clause}} expected-note 2 {{previously referenced here}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : r) // expected-error 2 {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel shared(i)
#pragma omp parallel reduction(min : i)
#pragma omp for simd reduction(max : j) // expected-error 2 {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#if defined(_OPENMP) && (_OPENMP <= 202111)
#pragma omp parallel private(fl) // expected-note 2 {{defined as private}}
#pragma omp for simd reduction(+ : fl) // expected-error 2 {{reduction variable must be shared}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel reduction(* : fl) // expected-note 2 {{defined as reduction}}
#pragma omp for simd reduction(+ : fl) // expected-error 2 {{reduction variable must be shared}}
for (int i = 0; i < 10; ++i)
foo();
#endif
return T();
}
namespace A {
double x;
#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
}
namespace B {
using A::x;
}
int main(int argc, char **argv) {
const int d = 5; // expected-note 2 {{'d' defined here}}
const int da[5] = {0}; // expected-note {{'da' defined here}}
int qa[5] = {0};
S4 e(4);
S5 g(5);
int i, z;
int &j = i; // expected-note 2 {{'j' defined here}}
S3 &p = k; // expected-note 2 {{'p' defined here}}
const int &r = da[i]; // expected-note {{'r' defined here}}
int &q = qa[i]; // expected-note {{'q' defined here}}
float fl;
#pragma omp parallel
#pragma omp for simd reduction // expected-error {{expected '(' after 'reduction'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction + // expected-error {{expected '(' after 'reduction'}} expected-warning {{extra tokens at the end of '#pragma omp for simd' are ignored}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction( // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(- // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction() // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(*) // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected expression}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(\) // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(foo : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} omp45-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}} omp50-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}} omp52-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}} omp60-error {{incorrect reduction identifier, expected one of '+', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(|| : argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name, array element or array section}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(~ : argc) // expected-error {{expected unqualified-id}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : argc, z)
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(^ : S1) // expected-error {{'S1' does not refer to a value}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 2 {{const-qualified variable cannot be reduction}} expected-error {{'operator+' is a private member of 'S2'}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(min : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 2 {{arguments of OpenMP clause 'reduction' for 'min' or 'max' must be of arithmetic type}} expected-error 2 {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(max : h.b) // expected-error {{expected variable name, array element or array section}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : ba) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(* : ca) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(- : da) // expected-error {{const-qualified variable cannot be reduction}} omp52-warning {{minus(-) operator for reductions is deprecated; use + or user defined reduction instead}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(^ : fl) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : S2::S2s) // expected-error {{shared variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(&& : S2::S2sc) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(& : e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}} expected-error {{invalid operands to binary expression ('S5' and 'S5')}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : h, k, B::x) // expected-error 2 {{threadprivate or thread local variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : o) // expected-error {{no viable overloaded '='}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd private(i), reduction(+ : j), reduction(+ : q) // expected-error 2 {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel private(k)
#pragma omp for simd reduction(+ : p), reduction(+ : p) // expected-error 2 {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : p), reduction(+ : p) // expected-error {{variable can appear only once in OpenMP 'reduction' clause}} expected-note {{previously referenced here}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel
#pragma omp for simd reduction(+ : r) // expected-error {{const-qualified variable cannot be reduction}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel shared(i)
#pragma omp parallel reduction(min : i)
#pragma omp for simd reduction(max : j) // expected-error {{argument of OpenMP clause 'reduction' must reference the same object in all threads}}
for (int i = 0; i < 10; ++i)
foo();
#if defined(_OPENMP) && (_OPENMP <= 202111)
#pragma omp parallel private(fl) // expected-note {{defined as private}}
#pragma omp for simd reduction(+ : fl) // expected-error {{reduction variable must be shared}}
for (int i = 0; i < 10; ++i)
foo();
#pragma omp parallel reduction(* : fl) // expected-note {{defined as reduction}}
#pragma omp for simd reduction(+ : fl) // expected-error {{reduction variable must be shared}}
for (int i = 0; i < 10; ++i)
foo();
#endif
static int m;
#pragma omp for simd reduction(+ : m)
for (int i = 0; i < 10; ++i)
m++;
#pragma omp for simd reduction(task, + : m) // omp45-error 2 {{expected expression}} omp45-warning {{missing ':' after reduction identifier - ignoring}} omp50-error {{'reduction' clause with 'task' modifier allowed only on non-simd parallel or worksharing constructs}} omp52-error {{'reduction' clause with 'task' modifier allowed only on non-simd parallel or worksharing constructs}} omp60-error {{'reduction' clause with 'task' modifier allowed only on non-simd parallel or worksharing constructs}}
for (int i = 0; i < 10; ++i)
m++;
return tmain(argc) + tmain(fl); // expected-note {{in instantiation of function template specialization 'tmain<int>' requested here}} expected-note {{in instantiation of function template specialization 'tmain<float>' requested here}}
}
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