#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*/ strcmp(char *, char *);
int get_reg_no(char *oper) {
  if (!(strcmp(oper, "001")))
    return 1;
  else if (!(strcmp(oper, "010")))
    return 2;
  else if (!(strcmp(oper, "011")))
    return 3;
  else if (!(strcmp(oper, "100")))
    return 4;
  else if (!strcmp(oper, "101"))
    return 5;
  else if (!strcmp(oper, ""))
    return 0;
}


x86 assembly (clang, -O0):
<get_reg_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,%eax
jne    1141 <get_reg_no+0x31>
movl   $0x1,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
mov    -0x10(%rbp),%rdi
lea    0xeb8(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%eax
jne    1166 <get_reg_no+0x56>
movl   $0x2,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
mov    -0x10(%rbp),%rdi
lea    0xe97(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%eax
jne    118b <get_reg_no+0x7b>
movl   $0x3,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
mov    -0x10(%rbp),%rdi
lea    0xe76(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%eax
jne    11b0 <get_reg_no+0xa0>
movl   $0x4,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
mov    -0x10(%rbp),%rdi
lea    0xe55(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%eax
jne    11d5 <get_reg_no+0xc5>
movl   $0x5,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
mov    -0x10(%rbp),%rdi
lea    0xe2f(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%eax
jne    11fa <get_reg_no+0xea>
movl   $0x0,-0x4(%rbp)
jmp    1213 <get_reg_no+0x103>
jmp    11ff <get_reg_no+0xef>
jmp    1204 <get_reg_no+0xf4>
jmp    1209 <get_reg_no+0xf9>
jmp    120e <get_reg_no+0xfe>
jmp    1213 <get_reg_no+0x103>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_reg_no>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
call   1030 <strcmp@plt>
test   %eax,%eax
je     1178 <get_reg_no+0x68>
lea    0xed9(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %eax,%eax
je     117f <get_reg_no+0x6f>
lea    0xeca(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %eax,%eax
je     1186 <get_reg_no+0x76>
lea    0xebb(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %eax,%eax
je     118d <get_reg_no+0x7d>
lea    0xeac(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
xor    %ecx,%ecx
test   %eax,%eax
sete   %cl
lea    (%rcx,%rcx,4),%eax
pop    %rbx
ret
mov    $0x1,%eax
pop    %rbx
ret
mov    $0x2,%eax
pop    %rbx
ret
mov    $0x3,%eax
pop    %rbx
ret
mov    $0x4,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"001\00"
@.str.1 = [4 x i8] c"010\00"
@.str.2 = [4 x i8] c"011\00"
@.str.3 = [4 x i8] c"100\00"
@.str.4 = [4 x i8] c"101\00"
@.str.5 = [1 x i8] zeroinitializer
define i32 @get_reg_no(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i32 @strcmp(i8* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%6 = icmp ne i32 %5, 0
br i1 %6, label %8, label %7
7: ; preds = %1
store i32 1, i32* %2
br label %38
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i32 @strcmp(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
%11 = icmp ne i32 %10, 0
br i1 %11, label %13, label %12
12: ; preds = %8
store i32 2, i32* %2
br label %38
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i32 @strcmp(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%16 = icmp ne i32 %15, 0
br i1 %16, label %18, label %17
17: ; preds = %13
store i32 3, i32* %2
br label %38
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i32 @strcmp(i8* %19, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%21 = icmp ne i32 %20, 0
br i1 %21, label %23, label %22
22: ; preds = %18
store i32 4, i32* %2
br label %38
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i32 @strcmp(i8* %24, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0))
%26 = icmp ne i32 %25, 0
br i1 %26, label %28, label %27
27: ; preds = %23
store i32 5, i32* %2
br label %38
28: ; preds = %23
%29 = load i8*, i8** %3
%30 = call i32 @strcmp(i8* %29, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.5, i64 0, i64 0))
%31 = icmp ne i32 %30, 0
br i1 %31, label %33, label %32
32: ; preds = %28
store i32 0, i32* %2
br label %38
33: ; preds = %28
br label %34
34: ; preds = %33
br label %35
35: ; preds = %34
br label %36
36: ; preds = %35
br label %37
37: ; preds = %36
br label %38
38: ; preds = %7, %12, %17, %22, %27, %32, %37
%39 = load i32, i32* %2
ret i32 %39
}

LLVM IR (-O2):
@.str = [4 x i8] c"001\00"
@.str.1 = [4 x i8] c"010\00"
@.str.2 = [4 x i8] c"011\00"
@.str.3 = [4 x i8] c"100\00"
@.str.4 = [4 x i8] c"101\00"
define i32 @get_reg_no(i8* nocapture %0) {
%2 = tail call i32 @strcmp(i8* dereferenceable(1) %0, i8* dereferenceable(4) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32 %2, 0
br i1 %3, label %17, label %4
4: ; preds = %1
%5 = tail call i32 @strcmp(i8* dereferenceable(1) %0, i8* dereferenceable(4) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i32 %5, 0
br i1 %6, label %17, label %7
7: ; preds = %4
%8 = tail call i32 @strcmp(i8* dereferenceable(1) %0, i8* dereferenceable(4) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i32 %8, 0
br i1 %9, label %17, label %10
10: ; preds = %7
%11 = tail call i32 @strcmp(i8* dereferenceable(1) %0, i8* dereferenceable(4) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i32 %11, 0
br i1 %12, label %17, label %13
13: ; preds = %10
%14 = tail call i32 @strcmp(i8* dereferenceable(1) %0, i8* dereferenceable(4) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0))
%15 = icmp eq i32 %14, 0
%16 = select i1 %15, i32 5, i32 0
br label %17
17: ; preds = %13, %10, %7, %4, %1
%18 = phi i32 [ 1, %1 ], [ 2, %4 ], [ 3, %7 ], [ 4, %10 ], [ %16, %13 ]
ret i32 %18
}