const char *hashtable_strerror(int hterror) {
  switch (hterror) {
  case 0:
    return "Success";
  case 1:
    return "Success yet out of memory";
  case 2:
    return "Out of memory";
  case 3:
    return "Key not found";
  case 4:
    return "Invalid argument";
  case 5:
    return "Duplicate key";
  default:
    return "Success";
  }
}


x86 assembly (clang, -O0):
<hashtable_strerror>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x5,%rax
ja     118c <hashtable_strerror+0x8c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xedd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xee7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xee5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xee3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xee4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1197 <hashtable_strerror+0x97>
lea    0xe85(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<hashtable_strerror>:
add    $0xffffffff,%edi
cmp    $0x4,%edi
ja     111a <hashtable_strerror+0x1a>
movslq %edi,%rax
lea    0xf4e(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xedf(%rip),%rax
ret

LLVM IR (-O0):
@.str = [8 x i8] c"Success\00"
@.str.1 = [26 x i8] c"Success yet out of memory\00"
@.str.2 = [14 x i8] c"Out of memory\00"
@.str.3 = [14 x i8] c"Key not found\00"
@.str.4 = [17 x i8] c"Invalid argument\00"
@.str.5 = [14 x i8] c"Duplicate key\00"
define i8* @hashtable_strerror(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %11 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
]
5: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %2
br label %12
6: ; preds = %1
store i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %12
7: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %12
8: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %12
9: ; preds = %1
store i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %12
10: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %12
11: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %2
br label %12
12: ; preds = %11, %10, %9, %8, %7, %6, %5
%13 = load i8*, i8** %2
ret i8* %13
}

LLVM IR (-O2):
@.str = [8 x i8] c"Success\00"
@.str.1 = [26 x i8] c"Success yet out of memory\00"
@.str.2 = [14 x i8] c"Out of memory\00"
@.str.3 = [14 x i8] c"Key not found\00"
@.str.4 = [17 x i8] c"Invalid argument\00"
@.str.5 = [14 x i8] c"Duplicate key\00"
@reltable.hashtable_strerror = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([26 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.hashtable_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.hashtable_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.hashtable_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([17 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.hashtable_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.5 to i64), i64 ptrtoint ([5 x i32]* @reltable.hashtable_strerror to i64)) to i32)]
define i8* @hashtable_strerror(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 5
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 ([5 x i32]* @reltable.hashtable_strerror to i8*), i64 %6)
br label %8
8: ; preds = %4, %1
%9 = phi i8* [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), %1 ], [ %7, %4 ]
ret i8* %9
}