#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 strlen(char *);
int char_index(char *str, char ch) {
  int i = 0;
  for (i = 0; i < strlen(str); i++)
    if (str[i] == ch)
      break;
  if (i == strlen(str))
    return -1;
  return i;
}


x86 assembly (clang, -O0):
<char_index>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %sil,%al
mov    %rdi,-0x10(%rbp)
mov    %al,-0x11(%rbp)
movl   $0x0,-0x18(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x1c(%rbp),%eax
cmp    %ecx,%eax
jge    117c <char_index+0x6c>
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
movsbl -0x11(%rbp),%ecx
cmp    %ecx,%eax
jne    1169 <char_index+0x59>
jmp    117c <char_index+0x6c>
jmp    116e <char_index+0x5e>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    1130 <char_index+0x20>
mov    -0x18(%rbp),%eax
mov    %eax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x20(%rbp),%eax
cmp    %ecx,%eax
jne    11a4 <char_index+0x94>
movl   $0xffffffff,-0x4(%rbp)
jmp    11aa <char_index+0x9a>
mov    -0x18(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<char_index>:
push   %rbp
push   %r14
push   %rbx
mov    %esi,%r14d
mov    %rdi,%rbx
call   1030 <strlen@plt>
xor    %ebp,%ebp
test   %eax,%eax
jle    1149 <char_index+0x39>
cs nopw 0x0(%rax,%rax,1)
nop
cmp    %r14b,(%rbx,%rbp,1)
je     1149 <char_index+0x39>
add    $0x1,%rbp
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbp
jl     1130 <char_index+0x20>
mov    %rbx,%rdi
call   1030 <strlen@plt>
cmp    %eax,%ebp
mov    $0xffffffff,%eax
cmovne %ebp,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
define i32 @char_index(i8* %0, i8 signext %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
store i32 0, i32* %6
br label %7
7: ; preds = %24, %2
%8 = load i32, i32* %6
%9 = load i8*, i8** %4
%10 = call i32 @strlen(i8* %9)
%11 = icmp slt i32 %8, %10
br i1 %11, label %12, label %27
12: ; preds = %7
%13 = load i8*, i8** %4
%14 = load i32, i32* %6
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = sext i8 %17 to i32
%19 = load i8, i8* %5
%20 = sext i8 %19 to i32
%21 = icmp eq i32 %18, %20
br i1 %21, label %22, label %23
22: ; preds = %12
br label %27
23: ; preds = %12
br label %24
24: ; preds = %23
%25 = load i32, i32* %6
%26 = add nsw i32 %25, 1
store i32 %26, i32* %6
br label %7
27: ; preds = %22, %7
%28 = load i32, i32* %6
%29 = load i8*, i8** %4
%30 = call i32 @strlen(i8* %29)
%31 = icmp eq i32 %28, %30
br i1 %31, label %32, label %33
32: ; preds = %27
store i32 -1, i32* %3
br label %35
33: ; preds = %27
%34 = load i32, i32* %6
store i32 %34, i32* %3
br label %35
35: ; preds = %33, %32
%36 = load i32, i32* %3
ret i32 %36
}

LLVM IR (-O2):
define i32 @char_index(i8* %0, i8 signext %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = icmp sgt i32 %3, 0
br i1 %4, label %5, label %18
5: ; preds = %2, %10
%6 = phi i64 [ %11, %10 ], [ 0, %2 ]
%7 = getelementptr inbounds i8, i8* %0, i64 %6
%8 = load i8, i8* %7
%9 = icmp eq i8 %8, %1
br i1 %9, label %15, label %10
10: ; preds = %5
%11 = add nuw nsw i64 %6, 1
%12 = tail call i32 @strlen(i8* %0)
%13 = sext i32 %12 to i64
%14 = icmp slt i64 %11, %13
br i1 %14, label %5, label %15
15: ; preds = %5, %10
%16 = phi i64 [ %11, %10 ], [ %6, %5 ]
%17 = trunc i64 %16 to i32
br label %18
18: ; preds = %15, %2
%19 = phi i32 [ 0, %2 ], [ %17, %15 ]
%20 = tail call i32 @strlen(i8* %0)
%21 = icmp eq i32 %19, %20
%22 = select i1 %21, i32 -1, i32 %19
ret i32 %22
}