const char *kvs_log_level2str(int level) {
  switch (level) {
  case 0x2:
    return "DEBUG";
  case 0x4:
    return "INFO";
  case 0x8:
    return "WARN";
  case 0x10:
    return "ERROR";
  }
  return "UNKNOWN";
}


x86 assembly (clang, -O0):
<kvs_log_level2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xfffffffe,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xe,%eax
ja     1170 <kvs_log_level2str+0x70>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf05(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <kvs_log_level2str+0x7b>
lea    0xefb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <kvs_log_level2str+0x7b>
lea    0xef0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <kvs_log_level2str+0x7b>
lea    0xee5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <kvs_log_level2str+0x7b>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<kvs_log_level2str>:
add    $0xfffffffe,%edi
ror    %edi
cmp    $0x7,%edi
ja     111c <kvs_log_level2str+0x1c>
movslq %edi,%rax
lea    0xf0c(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xef3(%rip),%rax
ret

LLVM IR (-O0):
@.str = [6 x i8] c"DEBUG\00"
@.str.1 = [5 x i8] c"INFO\00"
@.str.2 = [5 x i8] c"WARN\00"
@.str.3 = [6 x i8] c"ERROR\00"
@.str.4 = [8 x i8] c"UNKNOWN\00"
define i8* @kvs_log_level2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %9 [
i32 2, label %5
i32 4, label %6
i32 8, label %7
i32 16, label %8
]
5: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8** %2
br label %10
6: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %10
7: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %10
8: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %10
9: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %10
10: ; preds = %9, %8, %7, %6, %5
%11 = load i8*, i8** %2
ret i8* %11
}

LLVM IR (-O2):
@.str = [6 x i8] c"DEBUG\00"
@.str.1 = [5 x i8] c"INFO\00"
@.str.2 = [5 x i8] c"WARN\00"
@.str.3 = [6 x i8] c"ERROR\00"
@.str.4 = [8 x i8] c"UNKNOWN\00"
@reltable.kvs_log_level2str = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.kvs_log_level2str to i64)) to i32)]
define i8* @kvs_log_level2str(i32 %0) {
%2 = add i32 %0, -2
%3 = tail call i32 @llvm.fshl.i32(i32 %2, i32 %2, i32 31)
%4 = icmp ult i32 %3, 8
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 ([8 x i32]* @reltable.kvs_log_level2str to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), %1 ]
ret i8* %10
}