#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 *, char *);
int operator_decode(char x[2]) {
  if (strcmp(x, "+") == 0) {
    return 1;
  }
  if (strcmp(x, "-") == 0) {
    return 2;
  }
  if (strcmp(x, "*") == 0) {
    return 3;
  }
  if (strcmp(x, "/") == 0) {
    return 4;
  }
  if (strcmp(x, "%") == 0) {
    return 5;
  }
  return 0;
}


x86 assembly (clang, -O0):
<operator_decode>:
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 <operator_decode+0x32>
movl   $0x1,-0x4(%rbp)
jmp    11e1 <operator_decode+0xd1>
mov    -0x10(%rbp),%rdi
lea    0xeb5(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1168 <operator_decode+0x58>
movl   $0x2,-0x4(%rbp)
jmp    11e1 <operator_decode+0xd1>
mov    -0x10(%rbp),%rdi
lea    0xe91(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    118e <operator_decode+0x7e>
movl   $0x3,-0x4(%rbp)
jmp    11e1 <operator_decode+0xd1>
mov    -0x10(%rbp),%rdi
lea    0xe6d(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11b4 <operator_decode+0xa4>
movl   $0x4,-0x4(%rbp)
jmp    11e1 <operator_decode+0xd1>
mov    -0x10(%rbp),%rdi
lea    0xe49(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11da <operator_decode+0xca>
movl   $0x5,-0x4(%rbp)
jmp    11e1 <operator_decode+0xd1>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<operator_decode>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     117d <operator_decode+0x6d>
lea    0xed6(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1184 <operator_decode+0x74>
lea    0xec4(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     118b <operator_decode+0x7b>
lea    0xeb2(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1192 <operator_decode+0x82>
lea    0xea0(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
xor    %ecx,%ecx
test   %rax,%rax
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 = [2 x i8] c"+\00"
@.str.1 = [2 x i8] c"-\00"
@.str.2 = [2 x i8] c"*\00"
@.str.3 = [2 x i8] c"/\00"
@.str.4 = [2 x i8] c"%\00"
define i32 @operator_decode(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 ([2 x i8], [2 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 1, i32* %2
br label %29
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strcmp(i8* %9, i8* getelementptr inbounds ([2 x i8], [2 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 2, i32* %2
br label %29
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strcmp(i8* %14, i8* getelementptr inbounds ([2 x i8], [2 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 3, i32* %2
br label %29
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @strcmp(i8* %19, i8* getelementptr inbounds ([2 x i8], [2 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 4, i32* %2
br label %29
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i64 @strcmp(i8* %24, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%26 = icmp eq i64 %25, 0
br i1 %26, label %27, label %28
27: ; preds = %23
store i32 5, i32* %2
br label %29
28: ; preds = %23
store i32 0, i32* %2
br label %29
29: ; preds = %28, %27, %22, %17, %12, %7
%30 = load i32, i32* %2
ret i32 %30
}

LLVM IR (-O2):
@.str = [2 x i8] c"+\00"
@.str.1 = [2 x i8] c"-\00"
@.str.2 = [2 x i8] c"*\00"
@.str.3 = [2 x i8] c"/\00"
@.str.4 = [2 x i8] c"%\00"
define i32 @operator_decode(i8* %0) {
%2 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i64 %2, 0
br i1 %3, label %17, label %4
4: ; preds = %1
%5 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %17, label %7
7: ; preds = %4
%8 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i64 %8, 0
br i1 %9, label %17, label %10
10: ; preds = %7
%11 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i64 %11, 0
br i1 %12, label %17, label %13
13: ; preds = %10
%14 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%15 = icmp eq i64 %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
}