#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 */
unsigned int strlen(char const *);
int compare(const char *chaine1, const char *chaine2) {
  unsigned int i = 0;
  if (strlen(chaine1) != strlen(chaine2))
    return 0;
  for (i = 0; i < strlen(chaine1); i++)
    if (chaine1[i] != chaine2[i])
      return 0;
  return 1;
}


x86 assembly (clang, -O0):
<compare>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x20(%rbp),%eax
cmp    %ecx,%eax
je     1155 <compare+0x45>
movl   $0x0,-0x4(%rbp)
jmp    11bc <compare+0xac>
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
mov    %eax,-0x24(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x24(%rbp),%eax
cmp    %ecx,%eax
jae    11b5 <compare+0xa5>
mov    -0x10(%rbp),%rax
mov    -0x1c(%rbp),%ecx
movsbl (%rax,%rcx,1),%eax
mov    -0x18(%rbp),%rcx
mov    -0x1c(%rbp),%edx
movsbl (%rcx,%rdx,1),%ecx
cmp    %ecx,%eax
je     11a2 <compare+0x92>
movl   $0x0,-0x4(%rbp)
jmp    11bc <compare+0xac>
jmp    11a7 <compare+0x97>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    115c <compare+0x4c>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<compare>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%rbx
call   1030 <strlen@plt>
mov    %eax,%ebp
mov    %r14,%rdi
call   1030 <strlen@plt>
xor    %r15d,%r15d
cmp    %eax,%ebp
jne    1172 <compare+0x62>
mov    %rbx,%rdi
call   1030 <strlen@plt>
mov    $0x1,%r15d
test   %eax,%eax
je     1172 <compare+0x62>
xor    %ebp,%ebp
nopw   0x0(%rax,%rax,1)
movzbl (%rbx,%rbp,1),%eax
cmp    (%r14,%rbp,1),%al
jne    116f <compare+0x5f>
add    $0x1,%rbp
mov    %rbx,%rdi
call   1030 <strlen@plt>
mov    %eax,%eax
cmp    %rax,%rbp
jb     1150 <compare+0x40>
jmp    1172 <compare+0x62>
xor    %r15d,%r15d
mov    %r15d,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32 @compare(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
%7 = load i8*, i8** %4
%8 = call i32 @strlen(i8* %7)
%9 = load i8*, i8** %5
%10 = call i32 @strlen(i8* %9)
%11 = icmp ne i32 %8, %10
br i1 %11, label %12, label %13
12: ; preds = %2
store i32 0, i32* %3
br label %39
13: ; preds = %2
store i32 0, i32* %6
br label %14
14: ; preds = %35, %13
%15 = load i32, i32* %6
%16 = load i8*, i8** %4
%17 = call i32 @strlen(i8* %16)
%18 = icmp ult i32 %15, %17
br i1 %18, label %19, label %38
19: ; preds = %14
%20 = load i8*, i8** %4
%21 = load i32, i32* %6
%22 = zext i32 %21 to i64
%23 = getelementptr inbounds i8, i8* %20, i64 %22
%24 = load i8, i8* %23
%25 = sext i8 %24 to i32
%26 = load i8*, i8** %5
%27 = load i32, i32* %6
%28 = zext i32 %27 to i64
%29 = getelementptr inbounds i8, i8* %26, i64 %28
%30 = load i8, i8* %29
%31 = sext i8 %30 to i32
%32 = icmp ne i32 %25, %31
br i1 %32, label %33, label %34
33: ; preds = %19
store i32 0, i32* %3
br label %39
34: ; preds = %19
br label %35
35: ; preds = %34
%36 = load i32, i32* %6
%37 = add i32 %36, 1
store i32 %37, i32* %6
br label %14
38: ; preds = %14
store i32 1, i32* %3
br label %39
39: ; preds = %38, %33, %12
%40 = load i32, i32* %3
ret i32 %40
}

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