const char *tunit2str(int tunits) {
  if (tunits == 11)
    return ("years");
  else if (tunits == 10)
    return ("months");
  else if (tunits == 9)
    return ("days");
  else if (tunits == 8)
    return ("12hours");
  else if (tunits == 7)
    return ("6hours");
  else if (tunits == 6)
    return ("3hours");
  else if (tunits == 5)
    return ("hours");
  else if (tunits == 4)
    return ("30minutes");
  else if (tunits == 3)
    return ("15minutes");
  else if (tunits == 2)
    return ("minutes");
  else if (tunits == 1)
    return ("seconds");
  else
    return ("unknown");
}


x86 assembly (clang, -O0):
<tunit2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
cmpl   $0xb,-0xc(%rbp)
jne    1121 <tunit2str+0x21>
lea    0xee8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0xa,-0xc(%rbp)
jne    113b <tunit2str+0x3b>
lea    0xed4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x9,-0xc(%rbp)
jne    1155 <tunit2str+0x55>
lea    0xec1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x8,-0xc(%rbp)
jne    116f <tunit2str+0x6f>
lea    0xeac(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x7,-0xc(%rbp)
jne    1189 <tunit2str+0x89>
lea    0xe9a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x6,-0xc(%rbp)
jne    11a3 <tunit2str+0xa3>
lea    0xe87(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x5,-0xc(%rbp)
jne    11bd <tunit2str+0xbd>
lea    0xe60(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x4,-0xc(%rbp)
jne    11d7 <tunit2str+0xd7>
lea    0xe5a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x3,-0xc(%rbp)
jne    11f1 <tunit2str+0xf1>
lea    0xe4a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x2,-0xc(%rbp)
jne    120b <tunit2str+0x10b>
lea    0xe28(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
cmpl   $0x1,-0xc(%rbp)
jne    1225 <tunit2str+0x125>
lea    0xe20(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1230 <tunit2str+0x130>
lea    0xe18(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<tunit2str>:
add    $0xffffffff,%edi
cmp    $0xa,%edi
ja     111a <tunit2str+0x1a>
movslq %edi,%rax
lea    0xf3a(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf23(%rip),%rax
ret

LLVM IR (-O0):
@.str = [6 x i8] c"years\00"
@.str.1 = [7 x i8] c"months\00"
@.str.2 = [5 x i8] c"days\00"
@.str.3 = [8 x i8] c"12hours\00"
@.str.4 = [7 x i8] c"6hours\00"
@.str.5 = [7 x i8] c"3hours\00"
@.str.6 = [6 x i8] c"hours\00"
@.str.7 = [10 x i8] c"30minutes\00"
@.str.8 = [10 x i8] c"15minutes\00"
@.str.9 = [8 x i8] c"minutes\00"
@.str.10 = [8 x i8] c"seconds\00"
@.str.11 = [8 x i8] c"unknown\00"
define i8* @tunit2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
%5 = icmp eq i32 %4, 11
br i1 %5, label %6, label %7
6: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8** %2
br label %48
7: ; preds = %1
%8 = load i32, i32* %3
%9 = icmp eq i32 %8, 10
br i1 %9, label %10, label %11
10: ; preds = %7
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %48
11: ; preds = %7
%12 = load i32, i32* %3
%13 = icmp eq i32 %12, 9
br i1 %13, label %14, label %15
14: ; preds = %11
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %48
15: ; preds = %11
%16 = load i32, i32* %3
%17 = icmp eq i32 %16, 8
br i1 %17, label %18, label %19
18: ; preds = %15
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %48
19: ; preds = %15
%20 = load i32, i32* %3
%21 = icmp eq i32 %20, 7
br i1 %21, label %22, label %23
22: ; preds = %19
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %48
23: ; preds = %19
%24 = load i32, i32* %3
%25 = icmp eq i32 %24, 6
br i1 %25, label %26, label %27
26: ; preds = %23
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %48
27: ; preds = %23
%28 = load i32, i32* %3
%29 = icmp eq i32 %28, 5
br i1 %29, label %30, label %31
30: ; preds = %27
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %48
31: ; preds = %27
%32 = load i32, i32* %3
%33 = icmp eq i32 %32, 4
br i1 %33, label %34, label %35
34: ; preds = %31
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %48
35: ; preds = %31
%36 = load i32, i32* %3
%37 = icmp eq i32 %36, 3
br i1 %37, label %38, label %39
38: ; preds = %35
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %48
39: ; preds = %35
%40 = load i32, i32* %3
%41 = icmp eq i32 %40, 2
br i1 %41, label %42, label %43
42: ; preds = %39
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %48
43: ; preds = %39
%44 = load i32, i32* %3
%45 = icmp eq i32 %44, 1
br i1 %45, label %46, label %47
46: ; preds = %43
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %48
47: ; preds = %43
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %48
48: ; preds = %47, %46, %42, %38, %34, %30, %26, %22, %18, %14, %10, %6
%49 = load i8*, i8** %2
ret i8* %49
}

LLVM IR (-O2):
@.str = [6 x i8] c"years\00"
@.str.1 = [7 x i8] c"months\00"
@.str.2 = [5 x i8] c"days\00"
@.str.3 = [8 x i8] c"12hours\00"
@.str.4 = [7 x i8] c"6hours\00"
@.str.5 = [7 x i8] c"3hours\00"
@.str.6 = [6 x i8] c"hours\00"
@.str.7 = [10 x i8] c"30minutes\00"
@.str.8 = [10 x i8] c"15minutes\00"
@.str.9 = [8 x i8] c"minutes\00"
@.str.10 = [8 x i8] c"seconds\00"
@.str.11 = [8 x i8] c"unknown\00"
@reltable.tunit2str = [11 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.10 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.9 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.8 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.7 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.6 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.5 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.4 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.1 to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str to i64), i64 ptrtoint ([11 x i32]* @reltable.tunit2str to i64)) to i32)]
define i8* @tunit2str(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 11
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 ([11 x i32]* @reltable.tunit2str 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.11, i64 0, i64 0), %1 ]
ret i8* %9
}