#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__ my_strcmp(char *, char *);
int get_memunit(char *unit) {
  if (unit == NULL)
    return (-1);
  else if (my_strcmp(unit, "B") == 0)
    return (1);
  else if (my_strcmp(unit, "kB") == 0)
    return (2);
  else if (my_strcmp(unit, "MB") == 0)
    return (3);
  else if (my_strcmp(unit, "GB") == 0)
    return (4);
  else
    return (-1);
}


x86 assembly (clang, -O0):
<get_memunit>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1133 <get_memunit+0x23>
movl   $0xffffffff,-0x4(%rbp)
jmp    11d2 <get_memunit+0xc2>
mov    -0x10(%rbp),%rdi
lea    0xec9(%rip),%rsi
call   1030 <my_strcmp@plt>
cmp    $0x0,%rax
jne    1159 <get_memunit+0x49>
movl   $0x1,-0x4(%rbp)
jmp    11d2 <get_memunit+0xc2>
mov    -0x10(%rbp),%rdi
lea    0xe9c(%rip),%rsi
call   1030 <my_strcmp@plt>
cmp    $0x0,%rax
jne    117f <get_memunit+0x6f>
movl   $0x2,-0x4(%rbp)
jmp    11d2 <get_memunit+0xc2>
mov    -0x10(%rbp),%rdi
lea    0xe79(%rip),%rsi
call   1030 <my_strcmp@plt>
cmp    $0x0,%rax
jne    11a5 <get_memunit+0x95>
movl   $0x3,-0x4(%rbp)
jmp    11d2 <get_memunit+0xc2>
mov    -0x10(%rbp),%rdi
lea    0xe56(%rip),%rsi
call   1030 <my_strcmp@plt>
cmp    $0x0,%rax
jne    11cb <get_memunit+0xbb>
movl   $0x4,-0x4(%rbp)
jmp    11d2 <get_memunit+0xc2>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_memunit>:
push   %rbx
test   %rdi,%rdi
je     116b <get_memunit+0x5b>
mov    %rdi,%rbx
lea    0xee7(%rip),%rsi
call   1030 <my_strcmp@plt>
test   %rax,%rax
je     1172 <get_memunit+0x62>
lea    0xecf(%rip),%rsi
mov    %rbx,%rdi
call   1030 <my_strcmp@plt>
test   %rax,%rax
je     1179 <get_memunit+0x69>
lea    0xebe(%rip),%rsi
mov    %rbx,%rdi
call   1030 <my_strcmp@plt>
test   %rax,%rax
je     1180 <get_memunit+0x70>
lea    0xead(%rip),%rsi
mov    %rbx,%rdi
call   1030 <my_strcmp@plt>
neg    %rax
sbb    %eax,%eax
or     $0x4,%eax
pop    %rbx
ret
mov    $0xffffffff,%eax
pop    %rbx
ret
mov    $0x1,%eax
pop    %rbx
ret
mov    $0x2,%eax
pop    %rbx
ret
mov    $0x3,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [2 x i8] c"B\00"
@.str.1 = [3 x i8] c"kB\00"
@.str.2 = [3 x i8] c"MB\00"
@.str.3 = [3 x i8] c"GB\00"
define i32 @get_memunit(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = icmp eq i8* %4, null
br i1 %5, label %6, label %7
6: ; preds = %1
store i32 -1, i32* %2
br label %28
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = call i64 @my_strcmp(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%10 = icmp eq i64 %9, 0
br i1 %10, label %11, label %12
11: ; preds = %7
store i32 1, i32* %2
br label %28
12: ; preds = %7
%13 = load i8*, i8** %3
%14 = call i64 @my_strcmp(i8* %13, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%15 = icmp eq i64 %14, 0
br i1 %15, label %16, label %17
16: ; preds = %12
store i32 2, i32* %2
br label %28
17: ; preds = %12
%18 = load i8*, i8** %3
%19 = call i64 @my_strcmp(i8* %18, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%20 = icmp eq i64 %19, 0
br i1 %20, label %21, label %22
21: ; preds = %17
store i32 3, i32* %2
br label %28
22: ; preds = %17
%23 = load i8*, i8** %3
%24 = call i64 @my_strcmp(i8* %23, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0))
%25 = icmp eq i64 %24, 0
br i1 %25, label %26, label %27
26: ; preds = %22
store i32 4, i32* %2
br label %28
27: ; preds = %22
store i32 -1, i32* %2
br label %28
28: ; preds = %27, %26, %21, %16, %11, %6
%29 = load i32, i32* %2
ret i32 %29
}

LLVM IR (-O2):
@.str = [2 x i8] c"B\00"
@.str.1 = [3 x i8] c"kB\00"
@.str.2 = [3 x i8] c"MB\00"
@.str.3 = [3 x i8] c"GB\00"
define i32 @get_memunit(i8* %0) {
%2 = icmp eq i8* %0, null
br i1 %2, label %16, label %3
3: ; preds = %1
%4 = tail call i64 @my_strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i64 %4, 0
br i1 %5, label %16, label %6
6: ; preds = %3
%7 = tail call i64 @my_strcmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%8 = icmp eq i64 %7, 0
br i1 %8, label %16, label %9
9: ; preds = %6
%10 = tail call i64 @my_strcmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%11 = icmp eq i64 %10, 0
br i1 %11, label %16, label %12
12: ; preds = %9
%13 = tail call i64 @my_strcmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0))
%14 = icmp eq i64 %13, 0
%15 = select i1 %14, i32 4, i32 -1
br label %16
16: ; preds = %12, %9, %6, %3, %1
%17 = phi i32 [ -1, %1 ], [ 1, %3 ], [ 2, %6 ], [ 3, %9 ], [ %15, %12 ]
ret i32 %17
}