#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 */
typedef int int32_t;

/* Variables and functions */
char *r2rn(int32_t reg) {
  switch (reg) {
  case 0:
    return "$0";
  case 1:
    return "$at";
  case 2:
    return "$v0";
  case 3:
    return "$v1";
  case 4:
    return "$a0";
  case 5:
    return "$a1";
  case 6:
    return "$a2";
  case 7:
    return "$a3";
  case 8:
    return "$t0";
  case 9:
    return "$t1";
  case 10:
    return "$t2";
  case 11:
    return "$t3";
  case 12:
    return "$t4";
  case 13:
    return "$t5";
  case 14:
    return "$t6";
  case 15:
    return "$t7";
  case 16:
    return "$s0";
  case 17:
    return "$s1";
  case 18:
    return "$s2";
  case 19:
    return "$s3";
  case 20:
    return "$s4";
  case 21:
    return "$s5";
  case 22:
    return "$s6";
  case 23:
    return "$s7";
  case 24:
    return "$t8";
  case 25:
    return "$t9";
  case 26:
    return "$k0";
  case 27:
    return "$k1";
  case 28:
    return "$gp";
  case 29:
    return "$sp";
  case 30:
    return "$s8";
  case 31:
    return "$ra";
  }
  return "";
}


x86 assembly (clang, -O0):
<r2rn>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x1f,%rax
ja     132c <r2rn+0x22c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf4d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf40(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf34(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf28(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf1c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf10(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xf04(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xef8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xeec(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xee0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xed4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xec8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xeb0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xea4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe98(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe8c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe80(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe74(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe68(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe5c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe50(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe44(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe38(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe2c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe20(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe14(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xe08(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xdfc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xdf0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xde4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xdd8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1337 <r2rn+0x237>
lea    0xd4f(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<r2rn>:
cmp    $0x1f,%edi
ja     1117 <r2rn+0x17>
movslq %edi,%rax
lea    0xf71(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xee4(%rip),%rax
ret

LLVM IR (-O0):
@.str = [3 x i8] c"$0\00"
@.str.1 = [4 x i8] c"$at\00"
@.str.2 = [4 x i8] c"$v0\00"
@.str.3 = [4 x i8] c"$v1\00"
@.str.4 = [4 x i8] c"$a0\00"
@.str.5 = [4 x i8] c"$a1\00"
@.str.6 = [4 x i8] c"$a2\00"
@.str.7 = [4 x i8] c"$a3\00"
@.str.8 = [4 x i8] c"$t0\00"
@.str.9 = [4 x i8] c"$t1\00"
@.str.10 = [4 x i8] c"$t2\00"
@.str.11 = [4 x i8] c"$t3\00"
@.str.12 = [4 x i8] c"$t4\00"
@.str.13 = [4 x i8] c"$t5\00"
@.str.14 = [4 x i8] c"$t6\00"
@.str.15 = [4 x i8] c"$t7\00"
@.str.16 = [4 x i8] c"$s0\00"
@.str.17 = [4 x i8] c"$s1\00"
@.str.18 = [4 x i8] c"$s2\00"
@.str.19 = [4 x i8] c"$s3\00"
@.str.20 = [4 x i8] c"$s4\00"
@.str.21 = [4 x i8] c"$s5\00"
@.str.22 = [4 x i8] c"$s6\00"
@.str.23 = [4 x i8] c"$s7\00"
@.str.24 = [4 x i8] c"$t8\00"
@.str.25 = [4 x i8] c"$t9\00"
@.str.26 = [4 x i8] c"$k0\00"
@.str.27 = [4 x i8] c"$k1\00"
@.str.28 = [4 x i8] c"$gp\00"
@.str.29 = [4 x i8] c"$sp\00"
@.str.30 = [4 x i8] c"$s8\00"
@.str.31 = [4 x i8] c"$ra\00"
@.str.32 = [1 x i8] zeroinitializer
define i8* @r2rn(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %37 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 6, label %11
i32 7, label %12
i32 8, label %13
i32 9, label %14
i32 10, label %15
i32 11, label %16
i32 12, label %17
i32 13, label %18
i32 14, label %19
i32 15, label %20
i32 16, label %21
i32 17, label %22
i32 18, label %23
i32 19, label %24
i32 20, label %25
i32 21, label %26
i32 22, label %27
i32 23, label %28
i32 24, label %29
i32 25, label %30
i32 26, label %31
i32 27, label %32
i32 28, label %33
i32 29, label %34
i32 30, label %35
i32 31, label %36
]
5: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8** %2
br label %38
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %38
7: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %38
8: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %38
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %38
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %38
11: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %38
12: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %38
13: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %38
14: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %38
15: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %38
16: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %38
17: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %38
18: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %38
19: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %38
20: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %38
21: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %38
22: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %38
23: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %38
24: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.19, i64 0, i64 0), i8** %2
br label %38
25: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.20, i64 0, i64 0), i8** %2
br label %38
26: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.21, i64 0, i64 0), i8** %2
br label %38
27: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.22, i64 0, i64 0), i8** %2
br label %38
28: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.23, i64 0, i64 0), i8** %2
br label %38
29: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.24, i64 0, i64 0), i8** %2
br label %38
30: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.25, i64 0, i64 0), i8** %2
br label %38
31: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.26, i64 0, i64 0), i8** %2
br label %38
32: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.27, i64 0, i64 0), i8** %2
br label %38
33: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.28, i64 0, i64 0), i8** %2
br label %38
34: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.29, i64 0, i64 0), i8** %2
br label %38
35: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.30, i64 0, i64 0), i8** %2
br label %38
36: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.31, i64 0, i64 0), i8** %2
br label %38
37: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.32, i64 0, i64 0), i8** %2
br label %38
38: ; preds = %37, %36, %35, %34, %33, %32, %31, %30, %29, %28, %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%39 = load i8*, i8** %2
ret i8* %39
}

LLVM IR (-O2):
@.str = [3 x i8] c"$0\00"
@.str.1 = [4 x i8] c"$at\00"
@.str.2 = [4 x i8] c"$v0\00"
@.str.3 = [4 x i8] c"$v1\00"
@.str.4 = [4 x i8] c"$a0\00"
@.str.5 = [4 x i8] c"$a1\00"
@.str.6 = [4 x i8] c"$a2\00"
@.str.7 = [4 x i8] c"$a3\00"
@.str.8 = [4 x i8] c"$t0\00"
@.str.9 = [4 x i8] c"$t1\00"
@.str.10 = [4 x i8] c"$t2\00"
@.str.11 = [4 x i8] c"$t3\00"
@.str.12 = [4 x i8] c"$t4\00"
@.str.13 = [4 x i8] c"$t5\00"
@.str.14 = [4 x i8] c"$t6\00"
@.str.15 = [4 x i8] c"$t7\00"
@.str.16 = [4 x i8] c"$s0\00"
@.str.17 = [4 x i8] c"$s1\00"
@.str.18 = [4 x i8] c"$s2\00"
@.str.19 = [4 x i8] c"$s3\00"
@.str.20 = [4 x i8] c"$s4\00"
@.str.21 = [4 x i8] c"$s5\00"
@.str.22 = [4 x i8] c"$s6\00"
@.str.23 = [4 x i8] c"$s7\00"
@.str.24 = [4 x i8] c"$t8\00"
@.str.25 = [4 x i8] c"$t9\00"
@.str.26 = [4 x i8] c"$k0\00"
@.str.27 = [4 x i8] c"$k1\00"
@.str.28 = [4 x i8] c"$gp\00"
@.str.29 = [4 x i8] c"$sp\00"
@.str.30 = [4 x i8] c"$s8\00"
@.str.31 = [4 x i8] c"$ra\00"
@.str.32 = [1 x i8] zeroinitializer
@reltable.r2rn = [32 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.2 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.3 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.4 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.6 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.7 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.8 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.9 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.10 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.12 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.14 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.15 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.16 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.17 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.18 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.19 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.20 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.21 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.22 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.23 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.24 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.25 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.26 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.27 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.28 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.29 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.30 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.31 to i64), i64 ptrtoint ([32 x i32]* @reltable.r2rn to i64)) to i32)]
define i8* @r2rn(i32 %0) {
%2 = icmp ult i32 %0, 32
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = shl i64 %4, 2
%6 = call i8* @llvm.load.relative.i64(i8* bitcast ([32 x i32]* @reltable.r2rn to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([1 x i8], [1 x i8]* @.str.32, i64 0, i64 0), %1 ]
ret i8* %8
}