const char *xasm_operator_to_string(int op) {
  switch (op) {
  case 0x10:
    return "+";
  case 0x11:
    return "-";
  case 0x12:
    return "*";
  case 0x13:
    return "/";
  case 0x14:
    return "%";
  case 0x15:
    return "<<";
  case 0x16:
    return ">>";
  case 0x17:
    return "&";
  case 0x18:
    return "|";
  case 0x19:
    return "^";
  case 0x1A:
    return "==";
  case 0x1B:
    return "!=";
  case 0x1C:
    return "<";
  case 0x1D:
    return ">";
  case 0x1E:
    return "<=";
  case 0x1F:
    return ">=";
  case 0x20:
    return "!";
  case 0x21:
    return "~";
  case 0x22:
    return "<";
  case 0x23:
    return ">";
  case 0x24:
    return "-";
  case 0x25:
    return "^";
  }
  return "";
}


x86 assembly (clang, -O0):
<xasm_operator_to_string>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xfffffff0,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x15,%eax
ja     1290 <xasm_operator_to_string+0x190>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf21(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xf13(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xf05(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xef7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xece(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xec1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xeb3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe97(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe8a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe6c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe5f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe5d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe50(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe35(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xe0c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xdff(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xde3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xde5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    129b <xasm_operator_to_string+0x19b>
lea    0xde4(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<xasm_operator_to_string>:
add    $0xfffffff0,%edi
cmp    $0x15,%edi
ja     111a <xasm_operator_to_string+0x1a>
movslq %edi,%rax
lea    0xf16(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf02(%rip),%rax
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"
@.str.5 = [3 x i8] c"<<\00"
@.str.6 = [3 x i8] c">>\00"
@.str.7 = [2 x i8] c"&\00"
@.str.8 = [2 x i8] c"|\00"
@.str.9 = [2 x i8] c"^\00"
@.str.10 = [3 x i8] c"==\00"
@.str.11 = [3 x i8] c"!=\00"
@.str.12 = [2 x i8] c"<\00"
@.str.13 = [2 x i8] c">\00"
@.str.14 = [3 x i8] c"<=\00"
@.str.15 = [3 x i8] c">=\00"
@.str.16 = [2 x i8] c"!\00"
@.str.17 = [2 x i8] c"~\00"
@.str.18 = [1 x i8] zeroinitializer
define i8* @xasm_operator_to_string(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %27 [
i32 16, label %5
i32 17, label %6
i32 18, label %7
i32 19, label %8
i32 20, label %9
i32 21, label %10
i32 22, label %11
i32 23, label %12
i32 24, label %13
i32 25, label %14
i32 26, label %15
i32 27, label %16
i32 28, label %17
i32 29, label %18
i32 30, label %19
i32 31, label %20
i32 32, label %21
i32 33, label %22
i32 34, label %23
i32 35, label %24
i32 36, label %25
i32 37, label %26
]
5: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0), i8** %2
br label %28
6: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %28
7: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %28
8: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %28
9: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %28
10: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %28
11: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %28
12: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %28
13: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %28
14: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %28
15: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %28
16: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %28
17: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %28
18: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %28
19: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %28
20: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %28
21: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %28
22: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %28
23: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %28
24: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %28
25: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %28
26: ; preds = %1
store i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %28
27: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %28
28: ; preds = %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%29 = load i8*, i8** %2
ret i8* %29
}

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"
@.str.5 = [3 x i8] c"<<\00"
@.str.6 = [3 x i8] c">>\00"
@.str.7 = [2 x i8] c"&\00"
@.str.8 = [2 x i8] c"|\00"
@.str.9 = [2 x i8] c"^\00"
@.str.10 = [3 x i8] c"==\00"
@.str.11 = [3 x i8] c"!=\00"
@.str.12 = [2 x i8] c"<\00"
@.str.13 = [2 x i8] c">\00"
@.str.14 = [3 x i8] c"<=\00"
@.str.15 = [3 x i8] c">=\00"
@.str.16 = [2 x i8] c"!\00"
@.str.17 = [2 x i8] c"~\00"
@.str.18 = [1 x i8] zeroinitializer
@reltable.xasm_operator_to_string = [22 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.1 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.2 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.3 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.4 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.5 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.6 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.7 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.8 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.9 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.10 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.11 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.12 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.13 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.14 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str.15 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.16 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.17 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.12 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.13 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.1 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([2 x i8]* @.str.9 to i64), i64 ptrtoint ([22 x i32]* @reltable.xasm_operator_to_string to i64)) to i32)]
define i8* @xasm_operator_to_string(i32 %0) {
%2 = add i32 %0, -16
%3 = icmp ult i32 %2, 22
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([22 x i32]* @reltable.xasm_operator_to_string to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.18, i64 0, i64 0), %1 ]
ret i8* %9
}