const char *get_lock_action_name(int a) {
  switch (a) {
  case -1:
    return "sync";
  case -2:
    return "mix";
  case -3:
    return "lock";
  case -4:
    return "lockflushed";
  case 1:
    return "syncack";
  case 2:
    return "mixack";
  case 3:
    return "lockack";
  case 7:
    return "reqscatter";
  case 8:
    return "requnscatter";
  case 9:
    return "nudge";
  case 10:
    return "reqrdlock";
  default:
    return "???";
  }
}


x86 assembly (clang, -O0):
<get_lock_action_name>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0x4,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0xe,%eax
ja     11e0 <get_lock_action_name+0xe0>
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    11eb <get_lock_action_name+0xeb>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xf34(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xede(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xeda(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xed2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xec9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xec1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xeb9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xeaf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11eb <get_lock_action_name+0xeb>
lea    0xea9(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_lock_action_name>:
add    $0x4,%edi
cmp    $0xe,%edi
ja     111a <get_lock_action_name+0x1a>
movslq %edi,%rax
lea    0xf46(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf33(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"sync\00"
@.str.1 = [4 x i8] c"mix\00"
@.str.2 = [5 x i8] c"lock\00"
@.str.3 = [12 x i8] c"lockflushed\00"
@.str.4 = [8 x i8] c"syncack\00"
@.str.5 = [7 x i8] c"mixack\00"
@.str.6 = [8 x i8] c"lockack\00"
@.str.7 = [11 x i8] c"reqscatter\00"
@.str.8 = [13 x i8] c"requnscatter\00"
@.str.9 = [6 x i8] c"nudge\00"
@.str.10 = [10 x i8] c"reqrdlock\00"
@.str.11 = [4 x i8] c"???\00"
define i8* @get_lock_action_name(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %16 [
i32 -1, label %5
i32 -2, label %6
i32 -3, label %7
i32 -4, label %8
i32 1, label %9
i32 2, label %10
i32 3, label %11
i32 7, label %12
i32 8, label %13
i32 9, label %14
i32 10, label %15
]
5: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %2
br label %17
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %17
7: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %17
8: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %17
9: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %17
10: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %17
11: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %17
12: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %17
13: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %17
14: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %17
15: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %17
16: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %17
17: ; preds = %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%18 = load i8*, i8** %2
ret i8* %18
}

LLVM IR (-O2):
@.str = [5 x i8] c"sync\00"
@.str.1 = [4 x i8] c"mix\00"
@.str.2 = [5 x i8] c"lock\00"
@.str.3 = [12 x i8] c"lockflushed\00"
@.str.4 = [8 x i8] c"syncack\00"
@.str.5 = [7 x i8] c"mixack\00"
@.str.6 = [8 x i8] c"lockack\00"
@.str.7 = [11 x i8] c"reqscatter\00"
@.str.8 = [13 x i8] c"requnscatter\00"
@.str.9 = [6 x i8] c"nudge\00"
@.str.10 = [10 x i8] c"reqrdlock\00"
@.str.11 = [4 x i8] c"???\00"
@reltable.get_lock_action_name = [15 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.3 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.5 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.6 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.11 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.7 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.8 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.9 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.10 to i64), i64 ptrtoint ([15 x i32]* @reltable.get_lock_action_name to i64)) to i32)]
define i8* @get_lock_action_name(i32 %0) {
%2 = add i32 %0, 4
%3 = icmp ult i32 %2, 15
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 ([15 x i32]* @reltable.get_lock_action_name to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), %1 ]
ret i8* %9
}