#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__ strcmp(char const *, char *);
int get_register_no(const char *name) {
  if (strcmp(name, "eax") == 0) {
    return 0;
  }
  if (strcmp(name, "ebx") == 0) {
    return 1;
  }
  if (strcmp(name, "ecx") == 0) {
    return 2;
  }
  if (strcmp(name, "edx") == 0) {
    return 3;
  }
  return -1;
}


x86 assembly (clang, -O0):
<get_register_no>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1142 <get_register_no+0x32>
movl   $0x0,-0x4(%rbp)
jmp    11bb <get_register_no+0xab>
mov    -0x10(%rbp),%rdi
lea    0xeb7(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1168 <get_register_no+0x58>
movl   $0x1,-0x4(%rbp)
jmp    11bb <get_register_no+0xab>
mov    -0x10(%rbp),%rdi
lea    0xe95(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    118e <get_register_no+0x7e>
movl   $0x2,-0x4(%rbp)
jmp    11bb <get_register_no+0xab>
mov    -0x10(%rbp),%rdi
lea    0xe73(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11b4 <get_register_no+0xa4>
movl   $0x3,-0x4(%rbp)
jmp    11bb <get_register_no+0xab>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_register_no>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1166 <get_register_no+0x56>
lea    0xed8(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     116a <get_register_no+0x5a>
lea    0xec8(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1171 <get_register_no+0x61>
lea    0xeb8(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
neg    %rax
sbb    %eax,%eax
or     $0x3,%eax
pop    %rbx
ret
xor    %eax,%eax
pop    %rbx
ret
mov    $0x1,%eax
pop    %rbx
ret
mov    $0x2,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"eax\00"
@.str.1 = [4 x i8] c"ebx\00"
@.str.2 = [4 x i8] c"ecx\00"
@.str.3 = [4 x i8] c"edx\00"
define i32 @get_register_no(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 ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 0, i32* %2
br label %24
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strcmp(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 1, i32* %2
br label %24
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strcmp(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 2, i32* %2
br label %24
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @strcmp(i8* %19, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%21 = icmp eq i64 %20, 0
br i1 %21, label %22, label %23
22: ; preds = %18
store i32 3, i32* %2
br label %24
23: ; preds = %18
store i32 -1, i32* %2
br label %24
24: ; preds = %23, %22, %17, %12, %7
%25 = load i32, i32* %2
ret i32 %25
}

LLVM IR (-O2):
@.str = [4 x i8] c"eax\00"
@.str.1 = [4 x i8] c"ebx\00"
@.str.2 = [4 x i8] c"ecx\00"
@.str.3 = [4 x i8] c"edx\00"
define i32 @get_register_no(i8* %0) {
%2 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 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 ([4 x i8], [4 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 i64 @strcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i64 %8, 0
br i1 %9, label %14, label %10
10: ; preds = %7
%11 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i64 %11, 0
%13 = select i1 %12, i32 3, i32 -1
br label %14
14: ; preds = %10, %7, %4, %1
%15 = phi i32 [ 0, %1 ], [ 1, %4 ], [ 2, %7 ], [ %13, %10 ]
ret i32 %15
}