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// RUN: %libomptarget-compilexx-generic -fopenmp-cuda-mode
// RUN: %libomptarget-run-generic
// REQUIRES: libc
// REQUIRES: gpu
#include <assert.h>
#include <omp.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
// CHECK: PASS
// If the RPC headers are not present, just pass the test.
#if !__has_include(<../../libc/shared/rpc.h>)
int main() { printf("PASS\n"); }
#else
#include <../../libc/shared/rpc.h>
#include <../../libc/shared/rpc_dispatch.h>
[[gnu::weak]] rpc::Client client asm("__llvm_rpc_client");
#pragma omp declare target to(client) device_type(nohost)
//===------------------------------------------------------------------------===
// Opcodes.
//===------------------------------------------------------------------------===
constexpr uint32_t FOO_OPCODE = 1;
constexpr uint32_t VOID_OPCODE = 2;
constexpr uint32_t WRITEBACK_OPCODE = 3;
constexpr uint32_t CONST_PTR_OPCODE = 4;
constexpr uint32_t STRING_OPCODE = 5;
constexpr uint32_t EMPTY_OPCODE = 6;
constexpr uint32_t DIVERGENT_OPCODE = 7;
constexpr uint32_t ARRAY_SUM_OPCODE = 8;
//===------------------------------------------------------------------------===
// Server-side implementations.
//===------------------------------------------------------------------------===
struct S {
int arr[4];
};
// 1. Non-pointer arguments, non-void return.
int foo(int x, double d, char c) {
assert(x == 42);
assert(d == 0.0);
assert(c == 'c');
return -1;
}
// 2. Void return type.
void void_fn(int x) { assert(x == 7); }
// 3. Write-back pointer.
void writeback_fn(int *out) {
assert(out != nullptr && *out == 42);
*out = 99;
}
// 4. Const pointer.
int sum_const(const S *p) {
int s = 0;
for (int i = 0; i < 4; ++i)
s += p->arr[i];
return s;
}
// 5. const char * string.
int c_string(const char *s) {
assert(s != nullptr);
assert(strcmp(s, "hello") == 0);
return strlen(s);
}
// 6. Empty function.
int empty() { return 42; }
// 7. Divergent values.
void divergent(int *p) {
assert(p);
*p = *p;
}
// 8. Array argument via span.
int sum_array(const int *arr, int n) {
int s = 0;
for (int i = 0; i < n; ++i)
s += arr[i];
return s;
}
//===------------------------------------------------------------------------===
// RPC client dispatch.
//===------------------------------------------------------------------------===
#pragma omp begin declare variant match(device = {kind(gpu)})
int foo(int x, double d, char c) {
return rpc::dispatch<FOO_OPCODE>(client, foo, x, d, c);
}
void void_fn(int x) { rpc::dispatch<VOID_OPCODE>(client, void_fn, x); }
void writeback_fn(int *out) {
rpc::dispatch<WRITEBACK_OPCODE>(client, writeback_fn, out);
}
int sum_const(const S *p) {
return rpc::dispatch<CONST_PTR_OPCODE>(client, sum_const, p);
}
int c_string(const char *s) {
return rpc::dispatch<STRING_OPCODE>(client, c_string, s);
}
int empty() { return rpc::dispatch<EMPTY_OPCODE>(client, empty); }
void divergent(int *p) {
rpc::dispatch<DIVERGENT_OPCODE>(client, divergent, p);
}
int sum_array(const int *arr, int n) {
return rpc::dispatch<ARRAY_SUM_OPCODE>(
client, sum_array, rpc::span<const int>{arr, uint64_t(n)}, n);
}
#pragma omp end declare variant
//===------------------------------------------------------------------------===
// RPC server dispatch.
//===------------------------------------------------------------------------===
template <uint32_t NUM_LANES>
rpc::Status handleOpcodesImpl(rpc::Server::Port &Port) {
switch (Port.get_opcode()) {
case FOO_OPCODE:
rpc::invoke<NUM_LANES>(Port, foo);
break;
case VOID_OPCODE:
rpc::invoke<NUM_LANES>(Port, void_fn);
break;
case WRITEBACK_OPCODE:
rpc::invoke<NUM_LANES>(Port, writeback_fn);
break;
case CONST_PTR_OPCODE:
rpc::invoke<NUM_LANES>(Port, sum_const);
break;
case STRING_OPCODE:
rpc::invoke<NUM_LANES>(Port, c_string);
break;
case EMPTY_OPCODE:
rpc::invoke<NUM_LANES>(Port, empty);
break;
case DIVERGENT_OPCODE:
rpc::invoke<NUM_LANES>(Port, [](int *p) {
assert(p);
*p = *p;
});
break;
case ARRAY_SUM_OPCODE:
rpc::invoke<NUM_LANES>(Port, sum_array);
break;
default:
return rpc::RPC_UNHANDLED_OPCODE;
}
return rpc::RPC_SUCCESS;
}
static uint32_t handleOpcodes(void *raw, uint32_t numLanes) {
rpc::Server::Port &Port = *reinterpret_cast<rpc::Server::Port *>(raw);
if (numLanes == 1)
return handleOpcodesImpl<1>(Port);
else if (numLanes == 32)
return handleOpcodesImpl<32>(Port);
else if (numLanes == 64)
return handleOpcodesImpl<64>(Port);
else
return rpc::RPC_ERROR;
}
extern "C" void __tgt_register_rpc_callback(unsigned (*callback)(void *,
unsigned));
[[gnu::constructor]] void register_callback() {
__tgt_register_rpc_callback(&handleOpcodes);
}
int main() {
#pragma omp target
#pragma omp parallel num_threads(32)
{
// 1. Non-pointer return.
assert(foo(42, 0.0, 'c') == -1);
// 2. Void return.
void_fn(7);
// 3. Write-back pointer.
int value = 42;
writeback_fn(&value);
assert(value == 99);
// 4. Const pointer.
S s{1, 2, 3, 4};
int sum = sum_const(&s);
assert(sum == 10);
// 5. const char * string.
const char *msg = "hello";
int len = c_string(msg);
assert(len == 5);
// 6. No arguments.
int ret = empty();
assert(ret == 42);
// 7. Divergent values.
int id = omp_get_thread_num();
if (id % 2)
divergent(&id);
assert(id == omp_get_thread_num());
// 8. Array sum via span.
int arr[4] = {1, 2, 3, 4};
int total = sum_array(arr, 4);
assert(total == 10);
}
printf("PASS\n");
}
#endif
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