#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_thread_num();
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char **argv) {
  printf("\nBefore...\n\n");
#pragma omp parallel sections num_threads(4)
  {
#pragma omp section
    { printf("Task/section A performed by thread %d\n", omp_get_thread_num()); }
#pragma omp section
    { printf("Task/section B performed by thread %d\n", omp_get_thread_num()); }
#pragma omp section
    { printf("Task/section C performed by thread %d\n", omp_get_thread_num()); }
#pragma omp section
    { printf("Task/section D performed by thread %d\n", omp_get_thread_num()); }
  }
  printf("\nAfter...\n\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <omp_get_thread_num@plt>
mov    %eax,%esi
lea    0xeb9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <omp_get_thread_num@plt>
mov    %eax,%esi
lea    0xec9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <omp_get_thread_num@plt>
mov    %eax,%esi
lea    0xed9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1030 <omp_get_thread_num@plt>
mov    %eax,%esi
lea    0xee9(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xf02(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xf64(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
call   1040 <omp_get_thread_num@plt>
lea    0xeb5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
call   1040 <omp_get_thread_num@plt>
lea    0xec5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
call   1040 <omp_get_thread_num@plt>
lea    0xed5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
xor    %eax,%eax
call   1040 <omp_get_thread_num@plt>
lea    0xee5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xf08(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [13 x i8] c"\0ABefore...\0A\0A\00"
@.str.1 = [39 x i8] c"Task/section A performed by thread %d\0A\00"
@.str.2 = [39 x i8] c"Task/section B performed by thread %d\0A\00"
@.str.3 = [39 x i8] c"Task/section C performed by thread %d\0A\00"
@.str.4 = [39 x i8] c"Task/section D performed by thread %d\0A\00"
@.str.5 = [12 x i8] c"\0AAfter...\0A\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%7 = call i32 (...) @omp_get_thread_num()
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0), i32 %7)
%9 = call i32 (...) @omp_get_thread_num()
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%11 = call i32 (...) @omp_get_thread_num()
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.3, i64 0, i64 0), i32 %11)
%13 = call i32 (...) @omp_get_thread_num()
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.4, i64 0, i64 0), i32 %13)
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.5, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [39 x i8] c"Task/section A performed by thread %d\0A\00"
@.str.2 = [39 x i8] c"Task/section B performed by thread %d\0A\00"
@.str.3 = [39 x i8] c"Task/section C performed by thread %d\0A\00"
@.str.4 = [39 x i8] c"Task/section D performed by thread %d\0A\00"
@str = [12 x i8] c"\0ABefore...\0A\00"
@str.6 = [11 x i8] c"\0AAfter...\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @str, i64 0, i64 0))
%4 = tail call i32 (...) @omp_get_thread_num()
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.1, i64 0, i64 0), i32 %4)
%6 = tail call i32 (...) @omp_get_thread_num()
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.2, i64 0, i64 0), i32 %6)
%8 = tail call i32 (...) @omp_get_thread_num()
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.3, i64 0, i64 0), i32 %8)
%10 = tail call i32 (...) @omp_get_thread_num()
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @.str.4, i64 0, i64 0), i32 %10)
%12 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.6, i64 0, i64 0))
ret i32 0
}