int getSigFreq(int _signType) {
  switch (_signType) {
  case 0:
    return 1.57542E9;
  case 1:
    return 1.57542E9;
  case 2:
    return 1.22760E9;
  case 3:
    return 1.22760E9;
  case 4:
    return 1.17645E9;
  case 8:
    return 1.57542E9;
  case 9:
    return 1.57542E9;
  case 10:
    return 1.22760E9;
  case 11:
    return 1.22760E9;
  case 16:
    return 1.57542E9;
  case 17:
    return 1.57542E9;
  case 18:
    return 1.27875E9;
  case 19:
    return 1.27875E9;
  case 20:
    return 1.17645E9;
  case 21:
    return 1.17645E9;
  case 22:
    return 1.17645E9;
  case 24:
    return 1.57542E9;
  }
  return 1.57542E9;
}


x86 assembly (clang, -O0):
<getSigFreq>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%eax
mov    %rax,-0x10(%rbp)
sub    $0x18,%rax
ja     11f8 <getSigFreq+0xf8>
mov    -0x10(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x492bb080,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x492bb080,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x461f33d0,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x492bb080,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x492bb080,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x4c382d30,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x4c382d30,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x461f33d0,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x461f33d0,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x461f33d0,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
jmp    11ff <getSigFreq+0xff>
movl   $0x5de70060,-0x4(%rbp)
mov    -0x4(%rbp),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<getSigFreq>:
add    $0xfffffffe,%edi
mov    $0x5de70060,%eax
cmp    $0x14,%edi
ja     111a <getSigFreq+0x1a>
movslq %edi,%rax
lea    0xee9(%rip),%rcx
mov    (%rcx,%rax,4),%eax
ret

LLVM IR (-O0):
define i32 @getSigFreq(i32 %0) {
%2 = alloca i32
%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 8, label %10
i32 9, label %11
i32 10, label %12
i32 11, label %13
i32 16, label %14
i32 17, label %15
i32 18, label %16
i32 19, label %17
i32 20, label %18
i32 21, label %19
i32 22, label %20
i32 24, label %21
]
5: ; preds = %1
store i32 1575420000, i32* %2
br label %23
6: ; preds = %1
store i32 1575420000, i32* %2
br label %23
7: ; preds = %1
store i32 1227600000, i32* %2
br label %23
8: ; preds = %1
store i32 1227600000, i32* %2
br label %23
9: ; preds = %1
store i32 1176450000, i32* %2
br label %23
10: ; preds = %1
store i32 1575420000, i32* %2
br label %23
11: ; preds = %1
store i32 1575420000, i32* %2
br label %23
12: ; preds = %1
store i32 1227600000, i32* %2
br label %23
13: ; preds = %1
store i32 1227600000, i32* %2
br label %23
14: ; preds = %1
store i32 1575420000, i32* %2
br label %23
15: ; preds = %1
store i32 1575420000, i32* %2
br label %23
16: ; preds = %1
store i32 1278750000, i32* %2
br label %23
17: ; preds = %1
store i32 1278750000, i32* %2
br label %23
18: ; preds = %1
store i32 1176450000, i32* %2
br label %23
19: ; preds = %1
store i32 1176450000, i32* %2
br label %23
20: ; preds = %1
store i32 1176450000, i32* %2
br label %23
21: ; preds = %1
store i32 1575420000, i32* %2
br label %23
22: ; preds = %1
store i32 1575420000, i32* %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 i32, i32* %2
ret i32 %24
}

LLVM IR (-O2):
@switch.table.getSigFreq = [21 x i32] [i32 1227600000, i32 1227600000, i32 1176450000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1227600000, i32 1227600000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1575420000, i32 1278750000, i32 1278750000, i32 1176450000, i32 1176450000, i32 1176450000]
define i32 @getSigFreq(i32 %0) {
%2 = add i32 %0, -2
%3 = icmp ult i32 %2, 21
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = getelementptr inbounds [21 x i32], [21 x i32]* @switch.table.getSigFreq, i64 0, i64 %5
%7 = load i32, i32* %6
br label %8
8: ; preds = %4, %1
%9 = phi i32 [ 1575420000, %1 ], [ %7, %4 ]
ret i32 %9
}