char *SeqFormatString(int code) {
  switch (code) {
  case 0:
    return "Unknown";
  case 1:
    return "Intelligenetics";
  case 2:
    return "GenBank";
  case 3:
    return "PIR-NBRF";
  case 4:
    return "EMBL";
  case 5:
    return "GCG";
  case 6:
    return "Strider";
  case 7:
    return "FASTA";
  case 8:
    return "Zuker";
  case 9:
    return "Idraw";
  case 10:
    return "SELEX";
  case 11:
    return "MSF";
  case 12:
    return "PIR-CODATA";
  case 13:
    return "raw";
  case 14:
    return "Squid";
  default:
    return "(bad code)";
  }
}


x86 assembly (clang, -O0):
<SeqFormatString>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0xe,%rax
ja     121c <SeqFormatString+0x11c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf09(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xf01(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xf01(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xef9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xee7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xed3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xec9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xebf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xeb5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xeab(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xe9f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xe81(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xe8a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1227 <SeqFormatString+0x127>
lea    0xe80(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<SeqFormatString>:
cmp    $0xe,%edi
ja     1117 <SeqFormatString+0x17>
movslq %edi,%rax
lea    0xf65(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf49(%rip),%rax
ret

LLVM IR (-O0):
@.str = [8 x i8] c"Unknown\00"
@.str.1 = [16 x i8] c"Intelligenetics\00"
@.str.2 = [8 x i8] c"GenBank\00"
@.str.3 = [9 x i8] c"PIR-NBRF\00"
@.str.4 = [5 x i8] c"EMBL\00"
@.str.5 = [4 x i8] c"GCG\00"
@.str.6 = [8 x i8] c"Strider\00"
@.str.7 = [6 x i8] c"FASTA\00"
@.str.8 = [6 x i8] c"Zuker\00"
@.str.9 = [6 x i8] c"Idraw\00"
@.str.10 = [6 x i8] c"SELEX\00"
@.str.11 = [4 x i8] c"MSF\00"
@.str.12 = [11 x i8] c"PIR-CODATA\00"
@.str.13 = [4 x i8] c"raw\00"
@.str.14 = [6 x i8] c"Squid\00"
@.str.15 = [11 x i8] c"(bad code)\00"
define i8* @SeqFormatString(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %20 [
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
]
5: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %2
br label %21
6: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %21
7: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %21
8: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %21
9: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %21
10: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %21
11: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %21
12: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %21
13: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %21
14: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %21
15: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %21
16: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %21
17: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %21
18: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %21
19: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %21
20: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %21
21: ; preds = %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%22 = load i8*, i8** %2
ret i8* %22
}

LLVM IR (-O2):
@.str = [8 x i8] c"Unknown\00"
@.str.1 = [16 x i8] c"Intelligenetics\00"
@.str.2 = [8 x i8] c"GenBank\00"
@.str.3 = [9 x i8] c"PIR-NBRF\00"
@.str.4 = [5 x i8] c"EMBL\00"
@.str.5 = [4 x i8] c"GCG\00"
@.str.6 = [8 x i8] c"Strider\00"
@.str.7 = [6 x i8] c"FASTA\00"
@.str.8 = [6 x i8] c"Zuker\00"
@.str.9 = [6 x i8] c"Idraw\00"
@.str.10 = [6 x i8] c"SELEX\00"
@.str.11 = [4 x i8] c"MSF\00"
@.str.12 = [11 x i8] c"PIR-CODATA\00"
@.str.13 = [4 x i8] c"raw\00"
@.str.14 = [6 x i8] c"Squid\00"
@.str.15 = [11 x i8] c"(bad code)\00"
@reltable.SeqFormatString = [15 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.1 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.2 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.3 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.4 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.5 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.6 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.7 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.8 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.9 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.10 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.12 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.13 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.14 to i64), i64 ptrtoint ([15 x i32]* @reltable.SeqFormatString to i64)) to i32)]
define i8* @SeqFormatString(i32 %0) {
%2 = icmp ult i32 %0, 15
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 ([15 x i32]* @reltable.SeqFormatString to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([11 x i8], [11 x i8]* @.str.15, i64 0, i64 0), %1 ]
ret i8* %8
}