const char *calendar2str(int calendar) {
  if (calendar == 0)
    return ("standard");
  else if (calendar == 1)
    return ("proleptic_gregorian");
  else if (calendar == 2)
    return ("360_day");
  else if (calendar == 3)
    return ("365_day");
  else if (calendar == 4)
    return ("366_day");
  else
    return ("unknown");
}


x86 assembly (clang, -O0):
<calendar2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
cmpl   $0x0,-0xc(%rbp)
jne    1121 <calendar2str+0x21>
lea    0xee8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1194 <calendar2str+0x94>
cmpl   $0x1,-0xc(%rbp)
jne    113b <calendar2str+0x3b>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1194 <calendar2str+0x94>
cmpl   $0x2,-0xc(%rbp)
jne    1155 <calendar2str+0x55>
lea    0xed1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1194 <calendar2str+0x94>
cmpl   $0x3,-0xc(%rbp)
jne    116f <calendar2str+0x6f>
lea    0xebf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1194 <calendar2str+0x94>
cmpl   $0x4,-0xc(%rbp)
jne    1189 <calendar2str+0x89>
lea    0xead(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1194 <calendar2str+0x94>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<calendar2str>:
cmp    $0x4,%edi
ja     1117 <calendar2str+0x17>
movslq %edi,%rax
lea    0xf31(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf17(%rip),%rax
ret

LLVM IR (-O0):
@.str = [9 x i8] c"standard\00"
@.str.1 = [20 x i8] c"proleptic_gregorian\00"
@.str.2 = [8 x i8] c"360_day\00"
@.str.3 = [8 x i8] c"365_day\00"
@.str.4 = [8 x i8] c"366_day\00"
@.str.5 = [8 x i8] c"unknown\00"
define i8* @calendar2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
%5 = icmp eq i32 %4, 0
br i1 %5, label %6, label %7
6: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8** %2
br label %24
7: ; preds = %1
%8 = load i32, i32* %3
%9 = icmp eq i32 %8, 1
br i1 %9, label %10, label %11
10: ; preds = %7
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %24
11: ; preds = %7
%12 = load i32, i32* %3
%13 = icmp eq i32 %12, 2
br i1 %13, label %14, label %15
14: ; preds = %11
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %24
15: ; preds = %11
%16 = load i32, i32* %3
%17 = icmp eq i32 %16, 3
br i1 %17, label %18, label %19
18: ; preds = %15
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %24
19: ; preds = %15
%20 = load i32, i32* %3
%21 = icmp eq i32 %20, 4
br i1 %21, label %22, label %23
22: ; preds = %19
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %24
23: ; preds = %19
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %24
24: ; preds = %23, %22, %18, %14, %10, %6
%25 = load i8*, i8** %2
ret i8* %25
}

LLVM IR (-O2):
@.str = [9 x i8] c"standard\00"
@.str.1 = [20 x i8] c"proleptic_gregorian\00"
@.str.2 = [8 x i8] c"360_day\00"
@.str.3 = [8 x i8] c"365_day\00"
@.str.4 = [8 x i8] c"366_day\00"
@.str.5 = [8 x i8] c"unknown\00"
@reltable.calendar2str = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.calendar2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.calendar2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.calendar2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.calendar2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.calendar2str to i64)) to i32)]
define i8* @calendar2str(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.calendar2str to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), %1 ]
ret i8* %8
}