#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 Z_DATA_ERROR 132
#define Z_ERRNO 131
#define Z_MEM_ERROR 130
#define Z_STREAM_ERROR 129
#define Z_VERSION_ERROR 128
char *zerr(int err) {
  char *result = NULL;
  switch (err) {
  case Z_ERRNO:
    result = "Z_ERRNO;";
    break;
  case Z_STREAM_ERROR:
    result = "invalid compression level";
    break;
  case Z_DATA_ERROR:
    result = "invalid or incomplete deflate data";
    break;
  case Z_MEM_ERROR:
    result = "out of memory";
    break;
  case Z_VERSION_ERROR:
    result = "zlib version mismatch!";
    break;
  default:
    result = "default";
    break;
  }
  return result;
}


x86 assembly (clang, -O0):
<zerr>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
movq   $0x0,-0x10(%rbp)
mov    -0x4(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x4,%eax
ja     1188 <zerr+0x88>
mov    -0x18(%rbp),%rax
lea    0xed1(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xed5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1193 <zerr+0x93>
lea    0xece(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1193 <zerr+0x93>
lea    0xed8(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1193 <zerr+0x93>
lea    0xeeb(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1193 <zerr+0x93>
lea    0xee9(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    1193 <zerr+0x93>
lea    0xef0(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<zerr>:
add    $0xffffff80,%edi
cmp    $0x4,%edi
ja     111a <zerr+0x1a>
movslq %edi,%rax
lea    0xf62(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf4a(%rip),%rax
ret

LLVM IR (-O0):
@.str = [9 x i8] c"Z_ERRNO;\00"
@.str.1 = [26 x i8] c"invalid compression level\00"
@.str.2 = [35 x i8] c"invalid or incomplete deflate data\00"
@.str.3 = [14 x i8] c"out of memory\00"
@.str.4 = [23 x i8] c"zlib version mismatch!\00"
@.str.5 = [8 x i8] c"default\00"
define i8* @zerr(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
store i8* null, i8** %3
%4 = load i32, i32* %2
switch i32 %4, label %10 [
i32 131, label %5
i32 129, label %6
i32 132, label %7
i32 130, label %8
i32 128, label %9
]
5: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8** %3
br label %11
6: ; preds = %1
store i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %11
7: ; preds = %1
store i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %11
8: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %11
9: ; preds = %1
store i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %11
10: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %11
11: ; preds = %10, %9, %8, %7, %6, %5
%12 = load i8*, i8** %3
ret i8* %12
}

LLVM IR (-O2):
@.str = [9 x i8] c"Z_ERRNO;\00"
@.str.1 = [26 x i8] c"invalid compression level\00"
@.str.2 = [35 x i8] c"invalid or incomplete deflate data\00"
@.str.3 = [14 x i8] c"out of memory\00"
@.str.4 = [23 x i8] c"zlib version mismatch!\00"
@.str.5 = [8 x i8] c"default\00"
@reltable.zerr = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([23 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.zerr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([26 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.zerr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.zerr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.zerr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([35 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.zerr to i64)) to i32)]
define i8* @zerr(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 5
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 ([5 x i32]* @reltable.zerr 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.5, i64 0, i64 0), %1 ]
ret i8* %9
}