#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__ strcmp(char const *, char const *const);
int lookup(char const *const name) {
  static const char *list[] = {"John", "Jim", "Jane", "Clyde", NULL};
  int index = 0;
  while (list[index]) {
    if (strcmp(list[index], name) == 0)
      return (1);
    ++index;
  }
  return 0;
}


x86 assembly (clang, -O0):
<lookup>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
movslq -0x14(%rbp),%rcx
lea    0x2f02(%rip),%rax
cmpq   $0x0,(%rax,%rcx,8)
je     1175 <lookup+0x65>
movslq -0x14(%rbp),%rcx
lea    0x2eec(%rip),%rax
mov    (%rax,%rcx,8),%rdi
mov    -0x10(%rbp),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1167 <lookup+0x57>
movl   $0x1,-0x4(%rbp)
jmp    117c <lookup+0x6c>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1123 <lookup+0x13>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<lookup>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xee3(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcmp@plt>
mov    $0x1,%ebp
test   %rax,%rax
je     116f <lookup+0x5f>
lea    0xecf(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     116f <lookup+0x5f>
lea    0xebf(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     116f <lookup+0x5f>
lea    0xeb0(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcmp@plt>
xor    %ebp,%ebp
test   %rax,%rax
sete   %bpl
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@lookup.list = internal global [5 x i8*] [i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i32 0, i32 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i32 0, i32 0), i8* null]
@.str = [5 x i8] c"John\00"
@.str.1 = [4 x i8] c"Jim\00"
@.str.2 = [5 x i8] c"Jane\00"
@.str.3 = [6 x i8] c"Clyde\00"
define i32 @lookup(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
store i8* %0, i8** %3
store i32 0, i32* %4
br label %5
5: ; preds = %20, %1
%6 = load i32, i32* %4
%7 = sext i32 %6 to i64
%8 = getelementptr inbounds [5 x i8*], [5 x i8*]* @lookup.list, i64 0, i64 %7
%9 = load i8*, i8** %8
%10 = icmp ne i8* %9, null
br i1 %10, label %11, label %23
11: ; preds = %5
%12 = load i32, i32* %4
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds [5 x i8*], [5 x i8*]* @lookup.list, i64 0, i64 %13
%15 = load i8*, i8** %14
%16 = load i8*, i8** %3
%17 = call i64 @strcmp(i8* %15, i8* %16)
%18 = icmp eq i64 %17, 0
br i1 %18, label %19, label %20
19: ; preds = %11
store i32 1, i32* %2
br label %24
20: ; preds = %11
%21 = load i32, i32* %4
%22 = add nsw i32 %21, 1
store i32 %22, i32* %4
br label %5
23: ; preds = %5
store i32 0, i32* %2
br label %24
24: ; preds = %23, %19
%25 = load i32, i32* %2
ret i32 %25
}

LLVM IR (-O2):
@.str = [5 x i8] c"John\00"
@.str.1 = [4 x i8] c"Jim\00"
@.str.2 = [5 x i8] c"Jane\00"
@.str.3 = [6 x i8] c"Clyde\00"
define i32 @lookup(i8* %0) {
%2 = tail call i64 @strcmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* %0)
%3 = icmp eq i64 %2, 0
br i1 %3, label %14, label %4
4: ; preds = %1
%5 = tail call i64 @strcmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%6 = icmp eq i64 %5, 0
br i1 %6, label %14, label %7
7: ; preds = %4
%8 = tail call i64 @strcmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8* %0)
%9 = icmp eq i64 %8, 0
br i1 %9, label %14, label %10
10: ; preds = %7
%11 = tail call i64 @strcmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8* %0)
%12 = icmp eq i64 %11, 0
%13 = zext i1 %12 to i32
br label %14
14: ; preds = %10, %7, %4, %1
%15 = phi i32 [ 1, %1 ], [ 1, %4 ], [ 1, %7 ], [ %13, %10 ]
ret i32 %15
}