const char *vfslog_eventname(int eEvent) {
  const char *zEvent = 0;
  switch (eEvent) {
  case 3:
    zEvent = "xClose";
    break;
  case 14:
    zEvent = "xRead";
    break;
  case 20:
    zEvent = "xWrite";
    break;
  case 18:
    zEvent = "xTruncate";
    break;
  case 17:
    zEvent = "xSync";
    break;
  case 8:
    zEvent = "xFilesize";
    break;
  case 11:
    zEvent = "xLock";
    break;
  case 19:
    zEvent = "xUnlock";
    break;
  case 2:
    zEvent = "xCheckResLock";
    break;
  case 7:
    zEvent = "xFileControl";
    break;
  case 15:
    zEvent = "xSectorSize";
    break;
  case 6:
    zEvent = "xDeviceChar";
    break;
  case 12:
    zEvent = "xOpen";
    break;
  case 5:
    zEvent = "xDelete";
    break;
  case 1:
    zEvent = "xAccess";
    break;
  case 9:
    zEvent = "xFullPathname";
    break;
  case 13:
    zEvent = "xRandomness";
    break;
  case 16:
    zEvent = "xSleep";
    break;
  case 4:
    zEvent = "xCurrentTime";
    break;
  case 22:
    zEvent = "xShmUnmap";
    break;
  case 25:
    zEvent = "xShmLock";
    break;
  case 26:
    zEvent = "xShmBarrier";
    break;
  case 23:
    zEvent = "xShmMap";
    break;
  case 28:
    zEvent = "annotation";
    break;
  }
  return zEvent;
}


x86 assembly (clang, -O0):
<vfslog_eventname>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
movq   $0x0,-0x10(%rbp)
mov    -0x4(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x1b,%eax
ja     12b3 <vfslog_eventname+0x1b3>
mov    -0x18(%rbp),%rax
lea    0xed1(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf31(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xf28(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xf1e(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xf15(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xf0f(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xf05(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeff(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xef5(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeed(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeeb(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xee8(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xee4(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xee0(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xed6(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xece(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xec6(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xec4(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xec0(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeb7(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeb4(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xeae(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xea7(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xea3(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    12b3 <vfslog_eventname+0x1b3>
lea    0xe9b(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<vfslog_eventname>:
add    $0xffffffff,%edi
cmp    $0x1b,%edi
ja     1117 <vfslog_eventname+0x17>
movslq %edi,%rax
lea    0x2c5e(%rip),%rcx
mov    (%rcx,%rax,8),%rax
ret
xor    %eax,%eax
ret

LLVM IR (-O0):
@.str = [7 x i8] c"xClose\00"
@.str.1 = [6 x i8] c"xRead\00"
@.str.2 = [7 x i8] c"xWrite\00"
@.str.3 = [10 x i8] c"xTruncate\00"
@.str.4 = [6 x i8] c"xSync\00"
@.str.5 = [10 x i8] c"xFilesize\00"
@.str.6 = [6 x i8] c"xLock\00"
@.str.7 = [8 x i8] c"xUnlock\00"
@.str.8 = [14 x i8] c"xCheckResLock\00"
@.str.9 = [13 x i8] c"xFileControl\00"
@.str.10 = [12 x i8] c"xSectorSize\00"
@.str.11 = [12 x i8] c"xDeviceChar\00"
@.str.12 = [6 x i8] c"xOpen\00"
@.str.13 = [8 x i8] c"xDelete\00"
@.str.14 = [8 x i8] c"xAccess\00"
@.str.15 = [14 x i8] c"xFullPathname\00"
@.str.16 = [12 x i8] c"xRandomness\00"
@.str.17 = [7 x i8] c"xSleep\00"
@.str.18 = [13 x i8] c"xCurrentTime\00"
@.str.19 = [10 x i8] c"xShmUnmap\00"
@.str.20 = [9 x i8] c"xShmLock\00"
@.str.21 = [12 x i8] c"xShmBarrier\00"
@.str.22 = [8 x i8] c"xShmMap\00"
@.str.23 = [11 x i8] c"annotation\00"
define i8* @vfslog_eventname(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
store i8* null, i8** %3
%4 = load i32, i32* %2
switch i32 %4, label %29 [
i32 3, label %5
i32 14, label %6
i32 20, label %7
i32 18, label %8
i32 17, label %9
i32 8, label %10
i32 11, label %11
i32 19, label %12
i32 2, label %13
i32 7, label %14
i32 15, label %15
i32 6, label %16
i32 12, label %17
i32 5, label %18
i32 1, label %19
i32 9, label %20
i32 13, label %21
i32 16, label %22
i32 4, label %23
i32 22, label %24
i32 25, label %25
i32 26, label %26
i32 23, label %27
i32 28, label %28
]
5: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8** %3
br label %29
6: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %29
7: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %29
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %29
9: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %29
10: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %3
br label %29
11: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8** %3
br label %29
12: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.7, i64 0, i64 0), i8** %3
br label %29
13: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.8, i64 0, i64 0), i8** %3
br label %29
14: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.9, i64 0, i64 0), i8** %3
br label %29
15: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.10, i64 0, i64 0), i8** %3
br label %29
16: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.11, i64 0, i64 0), i8** %3
br label %29
17: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.12, i64 0, i64 0), i8** %3
br label %29
18: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.13, i64 0, i64 0), i8** %3
br label %29
19: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), i8** %3
br label %29
20: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.15, i64 0, i64 0), i8** %3
br label %29
21: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.16, i64 0, i64 0), i8** %3
br label %29
22: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.17, i64 0, i64 0), i8** %3
br label %29
23: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.18, i64 0, i64 0), i8** %3
br label %29
24: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.19, i64 0, i64 0), i8** %3
br label %29
25: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.20, i64 0, i64 0), i8** %3
br label %29
26: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.21, i64 0, i64 0), i8** %3
br label %29
27: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.22, i64 0, i64 0), i8** %3
br label %29
28: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.23, i64 0, i64 0), i8** %3
br label %29
29: ; preds = %1, %28, %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%30 = load i8*, i8** %3
ret i8* %30
}

LLVM IR (-O2):
@.str = [7 x i8] c"xClose\00"
@.str.1 = [6 x i8] c"xRead\00"
@.str.2 = [7 x i8] c"xWrite\00"
@.str.3 = [10 x i8] c"xTruncate\00"
@.str.4 = [6 x i8] c"xSync\00"
@.str.5 = [10 x i8] c"xFilesize\00"
@.str.6 = [6 x i8] c"xLock\00"
@.str.7 = [8 x i8] c"xUnlock\00"
@.str.8 = [14 x i8] c"xCheckResLock\00"
@.str.9 = [13 x i8] c"xFileControl\00"
@.str.10 = [12 x i8] c"xSectorSize\00"
@.str.11 = [12 x i8] c"xDeviceChar\00"
@.str.12 = [6 x i8] c"xOpen\00"
@.str.13 = [8 x i8] c"xDelete\00"
@.str.14 = [8 x i8] c"xAccess\00"
@.str.15 = [14 x i8] c"xFullPathname\00"
@.str.16 = [12 x i8] c"xRandomness\00"
@.str.17 = [7 x i8] c"xSleep\00"
@.str.18 = [13 x i8] c"xCurrentTime\00"
@.str.19 = [10 x i8] c"xShmUnmap\00"
@.str.20 = [9 x i8] c"xShmLock\00"
@.str.21 = [12 x i8] c"xShmBarrier\00"
@.str.22 = [8 x i8] c"xShmMap\00"
@.str.23 = [11 x i8] c"annotation\00"
@switch.table.vfslog_eventname = [28 x i8*] [i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.14, i64 0, i64 0), i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.8, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.18, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.13, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.11, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.15, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.12, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.16, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.17, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.7, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.19, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.22, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.20, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.21, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.23, i64 0, i64 0)]
define i8* @vfslog_eventname(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 28
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = getelementptr inbounds [28 x i8*], [28 x i8*]* @switch.table.vfslog_eventname, i64 0, i64 %5
%7 = load i8*, i8** %6
br label %8
8: ; preds = %4, %1
%9 = phi i8* [ null, %1 ], [ %7, %4 ]
ret i8* %9
}