#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__ memcmp(char *, char *, int);
char *get_name_for_type(char *type) {
  if (memcmp(type, "GEM", 3) == 0)
    return "Standard GEMDOS";
  else if (memcmp(type, "BGM", 3) == 0)
    return "Big GEMDOS";
  else if (memcmp(type, "XGM", 3) == 0)
    return "Extended";
  return "Unknown";
}


x86 assembly (clang, -O0):
<get_name_for_type>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
mov    $0x3,%edx
call   1030 <memcmp@plt>
cmp    $0x0,%rax
jne    114b <get_name_for_type+0x3b>
lea    0xec2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11be <get_name_for_type+0xae>
mov    -0x10(%rbp),%rdi
lea    0xebe(%rip),%rsi
mov    $0x3,%edx
call   1030 <memcmp@plt>
cmp    $0x0,%rax
jne    117a <get_name_for_type+0x6a>
lea    0xea7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11be <get_name_for_type+0xae>
mov    -0x10(%rbp),%rdi
lea    0xe9e(%rip),%rsi
mov    $0x3,%edx
call   1030 <memcmp@plt>
cmp    $0x0,%rax
jne    11a9 <get_name_for_type+0x99>
lea    0xe87(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11be <get_name_for_type+0xae>
jmp    11ae <get_name_for_type+0x9e>
jmp    11b3 <get_name_for_type+0xa3>
lea    0xe76(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_name_for_type>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
mov    $0x3,%edx
call   1030 <memcmp@plt>
test   %rax,%rax
je     116e <get_name_for_type+0x5e>
lea    0xee3(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <memcmp@plt>
test   %rax,%rax
je     1177 <get_name_for_type+0x67>
lea    0xed9(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <memcmp@plt>
test   %rax,%rax
lea    0xec6(%rip),%rcx
lea    0xec8(%rip),%rax
cmove  %rcx,%rax
pop    %rbx
ret
lea    0xe8f(%rip),%rax
pop    %rbx
ret
lea    0xe9a(%rip),%rax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"GEM\00"
@.str.1 = [16 x i8] c"Standard GEMDOS\00"
@.str.2 = [4 x i8] c"BGM\00"
@.str.3 = [11 x i8] c"Big GEMDOS\00"
@.str.4 = [4 x i8] c"XGM\00"
@.str.5 = [9 x i8] c"Extended\00"
@.str.6 = [8 x i8] c"Unknown\00"
define i8* @get_name_for_type(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @memcmp(i8* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %21
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @memcmp(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 3)
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %21
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @memcmp(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 3)
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %21
18: ; preds = %13
br label %19
19: ; preds = %18
br label %20
20: ; preds = %19
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %21
21: ; preds = %20, %17, %12, %7
%22 = load i8*, i8** %2
ret i8* %22
}

LLVM IR (-O2):
@.str = [4 x i8] c"GEM\00"
@.str.1 = [16 x i8] c"Standard GEMDOS\00"
@.str.2 = [4 x i8] c"BGM\00"
@.str.3 = [11 x i8] c"Big GEMDOS\00"
@.str.4 = [4 x i8] c"XGM\00"
@.str.5 = [9 x i8] c"Extended\00"
@.str.6 = [8 x i8] c"Unknown\00"
define i8* @get_name_for_type(i8* %0) {
%2 = tail call i64 @memcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%3 = icmp eq i64 %2, 0
br i1 %3, label %11, label %4
4: ; preds = %1
%5 = tail call i64 @memcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 3)
%6 = icmp eq i64 %5, 0
br i1 %6, label %11, label %7
7: ; preds = %4
%8 = tail call i64 @memcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 3)
%9 = icmp eq i64 %8, 0
%10 = select i1 %9, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.6, i64 0, i64 0)
br label %11
11: ; preds = %7, %4, %1
%12 = phi i8* [ getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), %1 ], [ getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), %4 ], [ %10, %7 ]
ret i8* %12
}