#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 /*<<< orphan*/ *strchr(char *, char);
scalar_t__ strcmp(char *, char *);
int valid_ipv4(char *);
int valid_ipv6(char *);
int valid_prefix(char *str) {
  if (strcmp(str, "dhcp") == 0 || strcmp(str, "dhcpv6") == 0)
    return 1;
  if (strchr(str, ':') == NULL)
    return valid_ipv4(str);
  else
    return valid_ipv6(str);
}


x86 assembly (clang, -O0):
<valid_prefix>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xea9(%rip),%rsi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
je     1180 <valid_prefix+0x40>
mov    -0x10(%rbp),%rdi
lea    0xe94(%rip),%rsi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
jne    118c <valid_prefix+0x4c>
movl   $0x1,-0x4(%rbp)
jmp    11c1 <valid_prefix+0x81>
mov    -0x10(%rbp),%rdi
mov    $0x3a,%esi
call   1030 <strchr@plt>
cmp    $0x0,%rax
jne    11b5 <valid_prefix+0x75>
mov    -0x10(%rbp),%rdi
call   1050 <valid_ipv4@plt>
mov    %eax,-0x4(%rbp)
jmp    11c1 <valid_prefix+0x81>
mov    -0x10(%rbp),%rdi
call   1060 <valid_ipv6@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<valid_prefix>:
push   %rbx
mov    %rdi,%rbx
lea    0xeb5(%rip),%rsi
call   1040 <strcmp@plt>
test   %rax,%rax
je     1184 <valid_prefix+0x44>
lea    0xea9(%rip),%rsi
mov    %rbx,%rdi
call   1040 <strcmp@plt>
test   %rax,%rax
je     1184 <valid_prefix+0x44>
mov    %rbx,%rdi
mov    $0x3a,%esi
call   1030 <strchr@plt>
mov    %rbx,%rdi
test   %rax,%rax
je     118b <valid_prefix+0x4b>
pop    %rbx
jmp    1060 <valid_ipv6@plt>
mov    $0x1,%eax
pop    %rbx
ret
pop    %rbx
jmp    1050 <valid_ipv4@plt>

LLVM IR (-O0):
@.str = [5 x i8] c"dhcp\00"
@.str.1 = [7 x i8] c"dhcpv6\00"
define i32 @valid_prefix(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strcmp(i8* %4, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %11, label %7
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = call i64 @strcmp(i8* %8, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0))
%10 = icmp eq i64 %9, 0
br i1 %10, label %11, label %12
11: ; preds = %7, %1
store i32 1, i32* %2
br label %22
12: ; preds = %7
%13 = load i8*, i8** %3
%14 = call i32* @strchr(i8* %13, i8 signext 58)
%15 = icmp eq i32* %14, null
br i1 %15, label %16, label %19
16: ; preds = %12
%17 = load i8*, i8** %3
%18 = call i32 @valid_ipv4(i8* %17)
store i32 %18, i32* %2
br label %22
19: ; preds = %12
%20 = load i8*, i8** %3
%21 = call i32 @valid_ipv6(i8* %20)
store i32 %21, i32* %2
br label %22
22: ; preds = %19, %16, %11
%23 = load i32, i32* %2
ret i32 %23
}

LLVM IR (-O2):
@.str = [5 x i8] c"dhcp\00"
@.str.1 = [7 x i8] c"dhcpv6\00"
define i32 @valid_prefix(i8* %0) {
%2 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i64 %2, 0
br i1 %3, label %14, label %4
4: ; preds = %1
%5 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %14, label %7
7: ; preds = %4
%8 = tail call i32* @strchr(i8* %0, i8 signext 58)
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %12
10: ; preds = %7
%11 = tail call i32 @valid_ipv4(i8* %0)
br label %14
12: ; preds = %7
%13 = tail call i32 @valid_ipv6(i8* %0)
br label %14
14: ; preds = %1, %4, %12, %10
%15 = phi i32 [ %11, %10 ], [ %13, %12 ], [ 1, %4 ], [ 1, %1 ]
ret i32 %15
}