char *colorToCoeffcient(int arg) {
  if (arg == 1)
    return "100 ppm";
  else if (arg == 2)
    return "50 ppm";
  else if (arg == 3)
    return "15 ppm";
  else if (arg == 4)
    return "25 ppm";
  else if (arg == 6)
    return "10 ppm";
  else if (arg == 7)
    return "5 ppm";
  else
    return "ERR no such Coefficient";
}


x86 assembly (clang, -O0):
<colorToCoeffcient>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
cmpl   $0x1,-0xc(%rbp)
jne    1121 <colorToCoeffcient+0x21>
lea    0xee8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
cmpl   $0x2,-0xc(%rbp)
jne    113b <colorToCoeffcient+0x3b>
lea    0xed6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
cmpl   $0x3,-0xc(%rbp)
jne    1155 <colorToCoeffcient+0x55>
lea    0xec3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
cmpl   $0x4,-0xc(%rbp)
jne    116f <colorToCoeffcient+0x6f>
lea    0xeb0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
cmpl   $0x6,-0xc(%rbp)
jne    1189 <colorToCoeffcient+0x89>
lea    0xe9d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
cmpl   $0x7,-0xc(%rbp)
jne    11a3 <colorToCoeffcient+0xa3>
lea    0xe76(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11ae <colorToCoeffcient+0xae>
lea    0xe7a(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<colorToCoeffcient>:
add    $0xffffffff,%edi
cmp    $0x6,%edi
ja     111a <colorToCoeffcient+0x1a>
movslq %edi,%rax
lea    0xf2a(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf03(%rip),%rax
ret

LLVM IR (-O0):
@.str = [8 x i8] c"100 ppm\00"
@.str.1 = [7 x i8] c"50 ppm\00"
@.str.2 = [7 x i8] c"15 ppm\00"
@.str.3 = [7 x i8] c"25 ppm\00"
@.str.4 = [7 x i8] c"10 ppm\00"
@.str.5 = [6 x i8] c"5 ppm\00"
@.str.6 = [24 x i8] c"ERR no such Coefficient\00"
define i8* @colorToCoeffcient(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
%5 = icmp eq i32 %4, 1
br i1 %5, label %6, label %7
6: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %2
br label %28
7: ; preds = %1
%8 = load i32, i32* %3
%9 = icmp eq i32 %8, 2
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 %28
11: ; preds = %7
%12 = load i32, i32* %3
%13 = icmp eq i32 %12, 3
br i1 %13, label %14, label %15
14: ; preds = %11
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %28
15: ; preds = %11
%16 = load i32, i32* %3
%17 = icmp eq i32 %16, 4
br i1 %17, label %18, label %19
18: ; preds = %15
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %28
19: ; preds = %15
%20 = load i32, i32* %3
%21 = icmp eq i32 %20, 6
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 %28
23: ; preds = %19
%24 = load i32, i32* %3
%25 = icmp eq i32 %24, 7
br i1 %25, label %26, label %27
26: ; preds = %23
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %28
27: ; preds = %23
store i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %28
28: ; preds = %27, %26, %22, %18, %14, %10, %6
%29 = load i8*, i8** %2
ret i8* %29
}

LLVM IR (-O2):
@.str = [8 x i8] c"100 ppm\00"
@.str.1 = [7 x i8] c"50 ppm\00"
@.str.2 = [7 x i8] c"15 ppm\00"
@.str.3 = [7 x i8] c"25 ppm\00"
@.str.4 = [7 x i8] c"10 ppm\00"
@.str.5 = [6 x i8] c"5 ppm\00"
@.str.6 = [24 x i8] c"ERR no such Coefficient\00"
@reltable.colorToCoeffcient = [7 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.1 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.2 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.3 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([24 x i8]* @.str.6 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.4 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.5 to i64), i64 ptrtoint ([7 x i32]* @reltable.colorToCoeffcient to i64)) to i32)]
define i8* @colorToCoeffcient(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 7
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 ([7 x i32]* @reltable.colorToCoeffcient to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([24 x i8], [24 x i8]* @.str.6, i64 0, i64 0), %1 ]
ret i8* %9
}