const char *diag_instance_str(unsigned int instance) {
  switch (instance) {
  case 0:
    return "CNTL";
  case 1:
    return "CMD";
  case 2:
    return "DATA";
  case 3:
    return "DCI_CMD";
  case 4:
    return "DCI";
  default:
    return "<unk>";
  }
}


x86 assembly (clang, -O0):
<diag_instance_str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x4,%rax
ja     117c <diag_instance_str+0x7c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1187 <diag_instance_str+0x87>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1187 <diag_instance_str+0x87>
lea    0xec6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1187 <diag_instance_str+0x87>
lea    0xebb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1187 <diag_instance_str+0x87>
lea    0xeb3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1187 <diag_instance_str+0x87>
lea    0xea7(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<diag_instance_str>:
cmp    $0x4,%edi
ja     1117 <diag_instance_str+0x17>
movslq %edi,%rax
lea    0xf0d(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xef8(%rip),%rax
ret

LLVM IR (-O0):
@.str = [5 x i8] c"CNTL\00"
@.str.1 = [4 x i8] c"CMD\00"
@.str.2 = [5 x i8] c"DATA\00"
@.str.3 = [8 x i8] c"DCI_CMD\00"
@.str.4 = [4 x i8] c"DCI\00"
@.str.5 = [6 x i8] c"<unk>\00"
define i8* @diag_instance_str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %10 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
]
5: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8** %2
br label %11
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %11
7: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %11
8: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %11
9: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %11
10: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %11
11: ; preds = %10, %9, %8, %7, %6, %5
%12 = load i8*, i8** %2
ret i8* %12
}

LLVM IR (-O2):
@.str = [5 x i8] c"CNTL\00"
@.str.1 = [4 x i8] c"CMD\00"
@.str.2 = [5 x i8] c"DATA\00"
@.str.3 = [8 x i8] c"DCI_CMD\00"
@.str.4 = [4 x i8] c"DCI\00"
@.str.5 = [6 x i8] c"<unk>\00"
@reltable.diag_instance_str = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.diag_instance_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.diag_instance_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.diag_instance_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.diag_instance_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.diag_instance_str to i64)) to i32)]
define i8* @diag_instance_str(i32 %0) {
%2 = icmp ult i32 %0, 5
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = shl i64 %4, 2
%6 = call i8* @llvm.load.relative.i64(i8* bitcast ([5 x i32]* @reltable.diag_instance_str to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), %1 ]
ret i8* %8
}