#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int omp_get_num_threads();
int omp_get_thread_num();
int /*<<< orphan*/ omp_set_num_threads(int);
int /*<<< orphan*/ printf(char *, int);
int main(int argc, char *argv[]) {
  int nthreads, tid;
  omp_set_num_threads(8);
#pragma omp parallel private(nthreads, tid)
  {
    tid = omp_get_thread_num();
    printf("Hello World from thread = %d\n", tid);
    if (tid == 0) {
      nthreads = omp_get_num_threads();
      printf("Number of threads = %d\n", nthreads);
    }
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    $0x8,%edi
call   1060 <omp_set_num_threads@plt>
mov    $0x0,%al
call   1030 <omp_get_thread_num@plt>
mov    %eax,-0x18(%rbp)
mov    -0x18(%rbp),%esi
lea    0xe8c(%rip),%rdi
call   1040 <printf@plt>
cmpl   $0x0,-0x18(%rbp)
jne    119c <main+0x5c>
mov    $0x0,%al
call   1050 <omp_get_num_threads@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%esi
lea    0xe87(%rip),%rdi
call   1040 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    $0x8,%edi
call   1060 <omp_set_num_threads@plt>
xor    %eax,%eax
call   1030 <omp_get_thread_num@plt>
mov    %eax,%ebx
lea    0xea5(%rip),%rdi
mov    %eax,%esi
call   1040 <printf@plt>
test   %ebx,%ebx
jne    117b <main+0x3b>
xor    %eax,%eax
call   1050 <omp_get_num_threads@plt>
lea    0xeaa(%rip),%rdi
mov    %eax,%esi
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [30 x i8] c"Hello World from thread = %d\0A\00"
@.str.1 = [24 x i8] c"Number of threads = %d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 @omp_set_num_threads(i32 8)
%9 = call i32 (...) @omp_get_thread_num()
store i32 %9, i32* %7
%10 = load i32, i32* %7
%11 = call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i32 %10)
%12 = load i32, i32* %7
%13 = icmp eq i32 %12, 0
br i1 %13, label %14, label %18
14: ; preds = %2
%15 = call i32 (...) @omp_get_num_threads()
store i32 %15, i32* %6
%16 = load i32, i32* %6
%17 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i32 %16)
br label %18
18: ; preds = %14, %2
%19 = load i32, i32* %3
ret i32 %19
}

LLVM IR (-O2):
@.str = [30 x i8] c"Hello World from thread = %d\0A\00"
@.str.1 = [24 x i8] c"Number of threads = %d\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @omp_set_num_threads(i32 8)
%4 = tail call i32 (...) @omp_get_thread_num()
%5 = tail call i32 @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i32 %4)
%6 = icmp eq i32 %4, 0
br i1 %6, label %7, label %10
7: ; preds = %2
%8 = tail call i32 (...) @omp_get_num_threads()
%9 = tail call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i32 %8)
br label %10
10: ; preds = %7, %2
ret i32 0
}