char *SSIErrorString(int n) {
  switch (n) {
  case 0:
    return "ok (no error)";
  case 1:
    return "no data, fread() failed";
  case 2:
    return "no such key";
  case 3:
    return "out of memory, malloc() failed";
  case 4:
    return "file not found, fopen() failed";
  case 5:
    return "not a SSI file? (bad magic)";
  case 6:
    return "corrupt format? unexpected data";
  case 7:
    return "no large file support for this system";
  case 8:
    return "failed to reposition on disk";
  case 9:
    return "failed to get file position on disk";
  case 10:
    return "no fast subseq support for this seqfile";
  case 11:
    return "subseq start is out of range";
  case 12:
    return "an argument is out of range";
  case 13:
    return "number of files exceeds limit";
  case 14:
    return "number of keys exceeds limit";
  case 15:
    return "an fwrite() failed";
  case 16:
    return "some problem with external sorting";
  default:
    return "unrecognized code";
  }
}


x86 assembly (clang, -O0):
<SSIErrorString>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x10,%rax
ja     123c <SSIErrorString+0x13c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf11(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf0f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf17(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf13(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf22(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf31(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf3d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf4d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf63(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf70(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf84(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xf9c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfa9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfb5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfc3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfd0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfd3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1247 <SSIErrorString+0x147>
lea    0xfe6(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<SSIErrorString>:
cmp    $0x10,%edi
ja     1117 <SSIErrorString+0x17>
movslq %edi,%rax
lea    0x10e9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0x10c7(%rip),%rax
ret

LLVM IR (-O0):
@.str = [14 x i8] c"ok (no error)\00"
@.str.1 = [24 x i8] c"no data, fread() failed\00"
@.str.2 = [12 x i8] c"no such key\00"
@.str.3 = [31 x i8] c"out of memory, malloc() failed\00"
@.str.4 = [31 x i8] c"file not found, fopen() failed\00"
@.str.5 = [28 x i8] c"not a SSI file? (bad magic)\00"
@.str.6 = [32 x i8] c"corrupt format? unexpected data\00"
@.str.7 = [38 x i8] c"no large file support for this system\00"
@.str.8 = [29 x i8] c"failed to reposition on disk\00"
@.str.9 = [36 x i8] c"failed to get file position on disk\00"
@.str.10 = [40 x i8] c"no fast subseq support for this seqfile\00"
@.str.11 = [29 x i8] c"subseq start is out of range\00"
@.str.12 = [28 x i8] c"an argument is out of range\00"
@.str.13 = [30 x i8] c"number of files exceeds limit\00"
@.str.14 = [29 x i8] c"number of keys exceeds limit\00"
@.str.15 = [19 x i8] c"an fwrite() failed\00"
@.str.16 = [35 x i8] c"some problem with external sorting\00"
@.str.17 = [18 x i8] c"unrecognized code\00"
define i8* @SSIErrorString(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %22 [
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
]
5: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8** %2
br label %23
6: ; preds = %1
store i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %23
7: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %23
8: ; preds = %1
store i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %23
9: ; preds = %1
store i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %23
10: ; preds = %1
store i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %23
11: ; preds = %1
store i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %23
12: ; preds = %1
store i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %23
13: ; preds = %1
store i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %23
14: ; preds = %1
store i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %23
15: ; preds = %1
store i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %23
16: ; preds = %1
store i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %23
17: ; preds = %1
store i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %23
18: ; preds = %1
store i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %23
19: ; preds = %1
store i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %23
20: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %23
21: ; preds = %1
store i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %23
22: ; preds = %1
store i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %23
23: ; preds = %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%24 = load i8*, i8** %2
ret i8* %24
}

LLVM IR (-O2):
@.str = [14 x i8] c"ok (no error)\00"
@.str.1 = [24 x i8] c"no data, fread() failed\00"
@.str.2 = [12 x i8] c"no such key\00"
@.str.3 = [31 x i8] c"out of memory, malloc() failed\00"
@.str.4 = [31 x i8] c"file not found, fopen() failed\00"
@.str.5 = [28 x i8] c"not a SSI file? (bad magic)\00"
@.str.6 = [32 x i8] c"corrupt format? unexpected data\00"
@.str.7 = [38 x i8] c"no large file support for this system\00"
@.str.8 = [29 x i8] c"failed to reposition on disk\00"
@.str.9 = [36 x i8] c"failed to get file position on disk\00"
@.str.10 = [40 x i8] c"no fast subseq support for this seqfile\00"
@.str.11 = [29 x i8] c"subseq start is out of range\00"
@.str.12 = [28 x i8] c"an argument is out of range\00"
@.str.13 = [30 x i8] c"number of files exceeds limit\00"
@.str.14 = [29 x i8] c"number of keys exceeds limit\00"
@.str.15 = [19 x i8] c"an fwrite() failed\00"
@.str.16 = [35 x i8] c"some problem with external sorting\00"
@.str.17 = [18 x i8] c"unrecognized code\00"
@reltable.SSIErrorString = [17 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([24 x i8]* @.str.1 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.2 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([31 x i8]* @.str.3 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([31 x i8]* @.str.4 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([28 x i8]* @.str.5 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([32 x i8]* @.str.6 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([38 x i8]* @.str.7 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([29 x i8]* @.str.8 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([36 x i8]* @.str.9 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([40 x i8]* @.str.10 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([29 x i8]* @.str.11 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([28 x i8]* @.str.12 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([30 x i8]* @.str.13 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([29 x i8]* @.str.14 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str.15 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([35 x i8]* @.str.16 to i64), i64 ptrtoint ([17 x i32]* @reltable.SSIErrorString to i64)) to i32)]
define i8* @SSIErrorString(i32 %0) {
%2 = icmp ult i32 %0, 17
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 ([17 x i32]* @reltable.SSIErrorString to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([18 x i8], [18 x i8]* @.str.17, i64 0, i64 0), %1 ]
ret i8* %8
}