#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 */
#define EAGAIN 135
#define EBUSY 134
#define EDEADLK 133
#define EINTR 132
#define EINVAL 131
#define ENOMEM 130
#define EPERM 129
#define ETIMEDOUT 128
char *err2str(int i) {
  switch (i) {
  case EBUSY:
    return "EBUSY";
  case EINVAL:
    return "EINVAL";
  case EAGAIN:
    return "EAGAIN";
  case EDEADLK:
    return "EDEADLK";
  case EPERM:
    return "EPERM";
  case ENOMEM:
    return "ENOMEM";
  case ETIMEDOUT:
    return "ETIMEDOUT";
  case EINTR:
    return "EINTR";
  default:
    return "unknown";
  }
}


x86 assembly (clang, -O0):
<err2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x7,%eax
ja     11b0 <err2str+0xb0>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xed6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xecd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xec5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xebb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xeb2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xeac(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11bb <err2str+0xbb>
lea    0xea2(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<err2str>:
add    $0xffffff80,%edi
cmp    $0x7,%edi
ja     111a <err2str+0x1a>
movslq %edi,%rax
lea    0xf32(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf18(%rip),%rax
ret

LLVM IR (-O0):
@.str = [6 x i8] c"EBUSY\00"
@.str.1 = [7 x i8] c"EINVAL\00"
@.str.2 = [7 x i8] c"EAGAIN\00"
@.str.3 = [8 x i8] c"EDEADLK\00"
@.str.4 = [6 x i8] c"EPERM\00"
@.str.5 = [7 x i8] c"ENOMEM\00"
@.str.6 = [10 x i8] c"ETIMEDOUT\00"
@.str.7 = [6 x i8] c"EINTR\00"
@.str.8 = [8 x i8] c"unknown\00"
define i8* @err2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %13 [
i32 134, label %5
i32 131, label %6
i32 135, label %7
i32 133, label %8
i32 129, label %9
i32 130, label %10
i32 128, label %11
i32 132, label %12
]
5: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8** %2
br label %14
6: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %14
7: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %14
8: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %14
9: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %14
10: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %14
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %14
12: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %14
13: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %14
14: ; preds = %13, %12, %11, %10, %9, %8, %7, %6, %5
%15 = load i8*, i8** %2
ret i8* %15
}

LLVM IR (-O2):
@.str = [6 x i8] c"EBUSY\00"
@.str.1 = [7 x i8] c"EINVAL\00"
@.str.2 = [7 x i8] c"EAGAIN\00"
@.str.3 = [8 x i8] c"EDEADLK\00"
@.str.4 = [6 x i8] c"EPERM\00"
@.str.5 = [7 x i8] c"ENOMEM\00"
@.str.6 = [10 x i8] c"ETIMEDOUT\00"
@.str.7 = [6 x i8] c"EINTR\00"
@.str.8 = [8 x i8] c"unknown\00"
@reltable.err2str = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.6 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.5 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.7 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.err2str to i64)) to i32)]
define i8* @err2str(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 8
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 ([8 x i32]* @reltable.err2str to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.8, i64 0, i64 0), %1 ]
ret i8* %9
}