const char *curve_name(int curve) {
  switch (curve) {
  case 1:
    return "sect163k1";
  case 2:
    return "sect163r1";
  case 3:
    return "sect163r2";
  case 4:
    return "sect193r1";
  case 5:
    return "sect193r2";
  case 6:
    return "sect233k1";
  case 7:
    return "sect233r1";
  case 8:
    return "sect239k1";
  case 9:
    return "sect283k1";
  case 10:
    return "sect283r1";
  case 11:
    return "sect409k1";
  case 12:
    return "sect409r1";
  case 13:
    return "sect571k1";
  case 14:
    return "sect571r1";
  case 15:
    return "secp160k1";
  case 16:
    return "secp160r1";
  case 17:
    return "secp160r2";
  case 18:
    return "secp192k1";
  case 19:
    return "prime192v1";
  case 20:
    return "secp224k1";
  case 21:
    return "secp224r1";
  case 22:
    return "secp256k1";
  case 23:
    return "prime256v1";
  case 24:
    return "secp384r1";
  case 25:
    return "secp521r1";
  default:
    return "UNKNOWN";
  }
}


x86 assembly (clang, -O0):
<curve_name>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x18,%eax
ja     12c0 <curve_name+0x1c0>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf2d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf27(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf21(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf1b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf15(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf0f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf09(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xf03(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xefd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xef7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xef1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xeeb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xee5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xed3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xecd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xec7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xec1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xeb6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xeb0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xeaa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xe9f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12cb <curve_name+0x1cb>
lea    0xe99(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<curve_name>:
add    $0xffffffff,%edi
cmp    $0x18,%edi
ja     111a <curve_name+0x1a>
movslq %edi,%rax
lea    0xff2(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xfdb(%rip),%rax
ret

LLVM IR (-O0):
@.str = [10 x i8] c"sect163k1\00"
@.str.1 = [10 x i8] c"sect163r1\00"
@.str.2 = [10 x i8] c"sect163r2\00"
@.str.3 = [10 x i8] c"sect193r1\00"
@.str.4 = [10 x i8] c"sect193r2\00"
@.str.5 = [10 x i8] c"sect233k1\00"
@.str.6 = [10 x i8] c"sect233r1\00"
@.str.7 = [10 x i8] c"sect239k1\00"
@.str.8 = [10 x i8] c"sect283k1\00"
@.str.9 = [10 x i8] c"sect283r1\00"
@.str.10 = [10 x i8] c"sect409k1\00"
@.str.11 = [10 x i8] c"sect409r1\00"
@.str.12 = [10 x i8] c"sect571k1\00"
@.str.13 = [10 x i8] c"sect571r1\00"
@.str.14 = [10 x i8] c"secp160k1\00"
@.str.15 = [10 x i8] c"secp160r1\00"
@.str.16 = [10 x i8] c"secp160r2\00"
@.str.17 = [10 x i8] c"secp192k1\00"
@.str.18 = [11 x i8] c"prime192v1\00"
@.str.19 = [10 x i8] c"secp224k1\00"
@.str.20 = [10 x i8] c"secp224r1\00"
@.str.21 = [10 x i8] c"secp256k1\00"
@.str.22 = [11 x i8] c"prime256v1\00"
@.str.23 = [10 x i8] c"secp384r1\00"
@.str.24 = [10 x i8] c"secp521r1\00"
@.str.25 = [8 x i8] c"UNKNOWN\00"
define i8* @curve_name(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %30 [
i32 1, label %5
i32 2, label %6
i32 3, label %7
i32 4, label %8
i32 5, label %9
i32 6, label %10
i32 7, label %11
i32 8, label %12
i32 9, label %13
i32 10, label %14
i32 11, label %15
i32 12, label %16
i32 13, label %17
i32 14, label %18
i32 15, label %19
i32 16, label %20
i32 17, label %21
i32 18, label %22
i32 19, label %23
i32 20, label %24
i32 21, label %25
i32 22, label %26
i32 23, label %27
i32 24, label %28
i32 25, label %29
]
5: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8** %2
br label %31
6: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %31
7: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %31
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %31
9: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %31
10: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %31
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %31
12: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %31
13: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %31
14: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %31
15: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %31
16: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %31
17: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %31
18: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %31
19: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %31
20: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %31
21: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %31
22: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %31
23: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %31
24: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.19, i64 0, i64 0), i8** %2
br label %31
25: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.20, i64 0, i64 0), i8** %2
br label %31
26: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.21, i64 0, i64 0), i8** %2
br label %31
27: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.22, i64 0, i64 0), i8** %2
br label %31
28: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.23, i64 0, i64 0), i8** %2
br label %31
29: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.24, i64 0, i64 0), i8** %2
br label %31
30: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.25, i64 0, i64 0), i8** %2
br label %31
31: ; preds = %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
%32 = load i8*, i8** %2
ret i8* %32
}

LLVM IR (-O2):
@.str = [10 x i8] c"sect163k1\00"
@.str.1 = [10 x i8] c"sect163r1\00"
@.str.2 = [10 x i8] c"sect163r2\00"
@.str.3 = [10 x i8] c"sect193r1\00"
@.str.4 = [10 x i8] c"sect193r2\00"
@.str.5 = [10 x i8] c"sect233k1\00"
@.str.6 = [10 x i8] c"sect233r1\00"
@.str.7 = [10 x i8] c"sect239k1\00"
@.str.8 = [10 x i8] c"sect283k1\00"
@.str.9 = [10 x i8] c"sect283r1\00"
@.str.10 = [10 x i8] c"sect409k1\00"
@.str.11 = [10 x i8] c"sect409r1\00"
@.str.12 = [10 x i8] c"sect571k1\00"
@.str.13 = [10 x i8] c"sect571r1\00"
@.str.14 = [10 x i8] c"secp160k1\00"
@.str.15 = [10 x i8] c"secp160r1\00"
@.str.16 = [10 x i8] c"secp160r2\00"
@.str.17 = [10 x i8] c"secp192k1\00"
@.str.18 = [11 x i8] c"prime192v1\00"
@.str.19 = [10 x i8] c"secp224k1\00"
@.str.20 = [10 x i8] c"secp224r1\00"
@.str.21 = [10 x i8] c"secp256k1\00"
@.str.22 = [11 x i8] c"prime256v1\00"
@.str.23 = [10 x i8] c"secp384r1\00"
@.str.24 = [10 x i8] c"secp521r1\00"
@.str.25 = [8 x i8] c"UNKNOWN\00"
@reltable.curve_name = [25 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.1 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.2 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.3 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.4 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.5 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.6 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.7 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.8 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.9 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.10 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.11 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.12 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.13 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.14 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.15 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.16 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.17 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.18 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.19 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.20 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.21 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.22 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.23 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.24 to i64), i64 ptrtoint ([25 x i32]* @reltable.curve_name to i64)) to i32)]
define i8* @curve_name(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 25
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 ([25 x i32]* @reltable.curve_name 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.25, i64 0, i64 0), %1 ]
ret i8* %9
}