#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 */
scalar_t__ strncmp(char const *, char *, int);
bool is_noreturn_func(const char *func_name) {
  return ((strncmp(func_name, "_exit", 5) == 0) ||
          (strncmp(func_name, "exit", 4) == 0) ||
          (strncmp(func_name, "pthread_exit", 12) == 0));
}


x86 assembly (clang, -O0):
<is_noreturn_func>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xee0(%rip),%rsi
mov    $0x5,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
mov    $0x1,%al
cmp    $0x0,%rcx
mov    %al,-0x9(%rbp)
je     1189 <is_noreturn_func+0x79>
mov    -0x8(%rbp),%rdi
lea    0xeba(%rip),%rsi
mov    $0x4,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
mov    $0x1,%al
cmp    $0x0,%rcx
mov    %al,-0x9(%rbp)
je     1189 <is_noreturn_func+0x79>
mov    -0x8(%rbp),%rdi
lea    0xe8b(%rip),%rsi
mov    $0xc,%edx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
sete   %al
mov    %al,-0x9(%rbp)
mov    -0x9(%rbp),%al
and    $0x1,%al
movzbl %al,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_noreturn_func>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xeea(%rip),%rsi
mov    $0x5,%edx
call   1030 <strncmp@plt>
mov    $0x1,%ebp
test   %rax,%rax
je     1167 <is_noreturn_func+0x57>
lea    0xed0(%rip),%rsi
mov    %rbx,%rdi
mov    $0x4,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1167 <is_noreturn_func+0x57>
lea    0xeaf(%rip),%rsi
mov    %rbx,%rdi
mov    $0xc,%edx
call   1030 <strncmp@plt>
xor    %ebp,%ebp
test   %rax,%rax
sete   %bpl
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"_exit\00"
@.str.1 = [5 x i8] c"exit\00"
@.str.2 = [13 x i8] c"pthread_exit\00"
define i32 @is_noreturn_func(i8* %0) {
%2 = alloca i8*
store i8* %0, i8** %2
%3 = load i8*, i8** %2
%4 = call i64 @strncmp(i8* %3, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 5)
%5 = icmp eq i64 %4, 0
br i1 %5, label %14, label %6
6: ; preds = %1
%7 = load i8*, i8** %2
%8 = call i64 @strncmp(i8* %7, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 4)
%9 = icmp eq i64 %8, 0
br i1 %9, label %14, label %10
10: ; preds = %6
%11 = load i8*, i8** %2
%12 = call i64 @strncmp(i8* %11, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 12)
%13 = icmp eq i64 %12, 0
br label %14
14: ; preds = %10, %6, %1
%15 = phi i1 [ true, %6 ], [ true, %1 ], [ %13, %10 ]
%16 = zext i1 %15 to i32
ret i32 %16
}

LLVM IR (-O2):
@.str = [6 x i8] c"_exit\00"
@.str.1 = [5 x i8] c"exit\00"
@.str.2 = [13 x i8] c"pthread_exit\00"
define i32 @is_noreturn_func(i8* %0) {
%2 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 5)
%3 = icmp eq i64 %2, 0
br i1 %3, label %11, label %4
4: ; preds = %1
%5 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i32 4)
%6 = icmp eq i64 %5, 0
br i1 %6, label %11, label %7
7: ; preds = %4
%8 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i32 12)
%9 = icmp eq i64 %8, 0
%10 = zext i1 %9 to i32
br label %11
11: ; preds = %7, %4, %1
%12 = phi i32 [ 1, %4 ], [ 1, %1 ], [ %10, %7 ]
ret i32 %12
}