const char *bugSeverity(short type) {
  switch (type) {
  case 1:
    return "Lesser";
    break;
  case 2:
    return "Minor";
    break;
  case 3:
    return "Major";
    break;
  case 4:
    return "Severe";
    break;
  case 5:
    return "Critical";
    break;
  default:
    return "Unknown??";
    break;
  }
}


x86 assembly (clang, -O0):
<bugSeverity>:
push   %rbp
mov    %rsp,%rbp
mov    %di,%ax
mov    %ax,-0xa(%rbp)
movswl -0xa(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x4,%eax
ja     1185 <bugSeverity+0x85>
mov    -0x18(%rbp),%rax
lea    0xed4(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1190 <bugSeverity+0x90>
lea    0xecf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1190 <bugSeverity+0x90>
lea    0xec5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1190 <bugSeverity+0x90>
lea    0xebb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1190 <bugSeverity+0x90>
lea    0xeb2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1190 <bugSeverity+0x90>
lea    0xeab(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<bugSeverity>:
add    $0xffffffff,%edi
cmp    $0x4,%edi
ja     111a <bugSeverity+0x1a>
movslq %edi,%rax
lea    0xf1e(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf02(%rip),%rax
ret

LLVM IR (-O0):
@.str = [7 x i8] c"Lesser\00"
@.str.1 = [6 x i8] c"Minor\00"
@.str.2 = [6 x i8] c"Major\00"
@.str.3 = [7 x i8] c"Severe\00"
@.str.4 = [9 x i8] c"Critical\00"
@.str.5 = [10 x i8] c"Unknown??\00"
define i8* @bugSeverity(i16 signext %0) {
%2 = alloca i8*
%3 = alloca i16
store i16 %0, i16* %3
%4 = load i16, i16* %3
%5 = sext i16 %4 to i32
switch i32 %5, label %11 [
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
]
6: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8** %2
br label %12
7: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %12
8: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %12
9: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %12
10: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %12
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %12
12: ; preds = %11, %10, %9, %8, %7, %6
%13 = load i8*, i8** %2
ret i8* %13
}

LLVM IR (-O2):
@.str = [7 x i8] c"Lesser\00"
@.str.1 = [6 x i8] c"Minor\00"
@.str.2 = [6 x i8] c"Major\00"
@.str.3 = [7 x i8] c"Severe\00"
@.str.4 = [9 x i8] c"Critical\00"
@.str.5 = [10 x i8] c"Unknown??\00"
@reltable.bugSeverity = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.bugSeverity to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.bugSeverity to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.bugSeverity to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.bugSeverity to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.bugSeverity to i64)) to i32)]
define i8* @bugSeverity(i16 signext %0) {
%2 = sext i16 %0 to i32
%3 = add nsw i32 %2, -1
%4 = icmp ult i32 %3, 5
br i1 %4, label %5, label %9
5: ; preds = %1
%6 = sext i32 %3 to i64
%7 = shl i64 %6, 2
%8 = call i8* @llvm.load.relative.i64(i8* bitcast ([5 x i32]* @reltable.bugSeverity to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), %1 ]
ret i8* %10
}