#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 *);
int is_in_list(const char *what, const char **list) {
  int lidx = 0;
  while (list[lidx]) {
    if (strcmp(what, list[lidx]) == 0) {
      return lidx;
    }
    lidx++;
  }
  return -1;
}


x86 assembly (clang, -O0):
<is_in_list>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
cmpq   $0x0,(%rax,%rcx,8)
je     1172 <is_in_list+0x62>
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
mov    (%rax,%rcx,8),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1164 <is_in_list+0x54>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    1179 <is_in_list+0x69>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1127 <is_in_list+0x17>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_in_list>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rsi,%rbx
mov    (%rsi),%rsi
mov    $0xffffffff,%r14d
test   %rsi,%rsi
je     1150 <is_in_list+0x40>
mov    %rdi,%r15
xor    %ebp,%ebp
nopl   (%rax)
mov    %r15,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     114d <is_in_list+0x3d>
mov    0x8(%rbx,%rbp,8),%rsi
add    $0x1,%rbp
test   %rsi,%rsi
jne    1130 <is_in_list+0x20>
jmp    1150 <is_in_list+0x40>
mov    %ebp,%r14d
mov    %r14d,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32 @is_in_list(i8* %0, i8** %1) {
%3 = alloca i32
%4 = alloca i8*
%5 = alloca i8**
%6 = alloca i32
store i8* %0, i8** %4
store i8** %1, i8*** %5
store i32 0, i32* %6
br label %7
7: ; preds = %25, %2
%8 = load i8**, i8*** %5
%9 = load i32, i32* %6
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds i8*, i8** %8, i64 %10
%12 = load i8*, i8** %11
%13 = icmp ne i8* %12, null
br i1 %13, label %14, label %28
14: ; preds = %7
%15 = load i8*, i8** %4
%16 = load i8**, i8*** %5
%17 = load i32, i32* %6
%18 = sext i32 %17 to i64
%19 = getelementptr inbounds i8*, i8** %16, i64 %18
%20 = load i8*, i8** %19
%21 = call i64 @strcmp(i8* %15, i8* %20)
%22 = icmp eq i64 %21, 0
br i1 %22, label %23, label %25
23: ; preds = %14
%24 = load i32, i32* %6
store i32 %24, i32* %3
br label %29
25: ; preds = %14
%26 = load i32, i32* %6
%27 = add nsw i32 %26, 1
store i32 %27, i32* %6
br label %7
28: ; preds = %7
store i32 -1, i32* %3
br label %29
29: ; preds = %28, %23
%30 = load i32, i32* %3
ret i32 %30
}

LLVM IR (-O2):
define i32 @is_in_list(i8* %0, i8** nocapture %1) {
%3 = load i8*, i8** %1
%4 = icmp eq i8* %3, null
br i1 %4, label %17, label %5
5: ; preds = %2, %10
%6 = phi i64 [ %11, %10 ], [ 0, %2 ]
%7 = phi i8* [ %13, %10 ], [ %3, %2 ]
%8 = tail call i64 @strcmp(i8* %0, i8* %7)
%9 = icmp eq i64 %8, 0
br i1 %9, label %15, label %10
10: ; preds = %5
%11 = add nuw i64 %6, 1
%12 = getelementptr inbounds i8*, i8** %1, i64 %11
%13 = load i8*, i8** %12
%14 = icmp eq i8* %13, null
br i1 %14, label %17, label %5
15: ; preds = %5
%16 = trunc i64 %6 to i32
br label %17
17: ; preds = %10, %15, %2
%18 = phi i32 [ -1, %2 ], [ %16, %15 ], [ -1, %10 ]
ret i32 %18
}