char *jwErrorToString(int err) {
  switch (err) {
  case 0:
    return "OK";
  case 1:
    return "output buffer full";
  case 2:
    return "tried to write Array value into Object";
  case 3:
    return "tried to write Object key/value into Array";
  case 4:
    return "array/object nesting > JWRITE_STACK_DEPTH";
  case 5:
    return "stack underflow error (too many 'end's)";
  case 6:
    return "nesting error, not all objects closed when jwClose() called";
  }
  return "Unknown error";
}


x86 assembly (clang, -O0):
<jwErrorToString>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x6,%rax
ja     119c <jwErrorToString+0x9c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xedc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xef6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xf11(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xf2b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xf43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a7 <jwErrorToString+0xa7>
lea    0xf6f(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<jwErrorToString>:
cmp    $0x6,%edi
ja     1117 <jwErrorToString+0x17>
movslq %edi,%rax
lea    0xff5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xfd8(%rip),%rax
ret

LLVM IR (-O0):
@.str = [3 x i8] c"OK\00"
@.str.1 = [19 x i8] c"output buffer full\00"
@.str.2 = [39 x i8] c"tried to write Array value into Object\00"
@.str.3 = [43 x i8] c"tried to write Object key/value into Array\00"
@.str.4 = [42 x i8] c"array/object nesting > JWRITE_STACK_DEPTH\00"
@.str.5 = [40 x i8] c"stack underflow error (too many 'end's)\00"
@.str.6 = [60 x i8] c"nesting error, not all objects closed when jwClose() called\00"
@.str.7 = [14 x i8] c"Unknown error\00"
define i8* @jwErrorToString(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %12 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 6, label %11
]
5: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8** %2
br label %13
6: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %13
7: ; preds = %1
store i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %13
8: ; preds = %1
store i8* getelementptr inbounds ([43 x i8], [43 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %13
9: ; preds = %1
store i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %13
10: ; preds = %1
store i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %13
11: ; preds = %1
store i8* getelementptr inbounds ([60 x i8], [60 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %13
12: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %13
13: ; preds = %12, %11, %10, %9, %8, %7, %6, %5
%14 = load i8*, i8** %2
ret i8* %14
}

LLVM IR (-O2):
@.str = [3 x i8] c"OK\00"
@.str.1 = [19 x i8] c"output buffer full\00"
@.str.2 = [39 x i8] c"tried to write Array value into Object\00"
@.str.3 = [43 x i8] c"tried to write Object key/value into Array\00"
@.str.4 = [42 x i8] c"array/object nesting > JWRITE_STACK_DEPTH\00"
@.str.5 = [40 x i8] c"stack underflow error (too many 'end's)\00"
@.str.6 = [60 x i8] c"nesting error, not all objects closed when jwClose() called\00"
@.str.7 = [14 x i8] c"Unknown error\00"
@reltable.jwErrorToString = [7 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str.1 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([39 x i8]* @.str.2 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([43 x i8]* @.str.3 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([42 x i8]* @.str.4 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([40 x i8]* @.str.5 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([60 x i8]* @.str.6 to i64), i64 ptrtoint ([7 x i32]* @reltable.jwErrorToString to i64)) to i32)]
define i8* @jwErrorToString(i32 %0) {
%2 = icmp ult i32 %0, 7
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 ([7 x i32]* @reltable.jwErrorToString to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([14 x i8], [14 x i8]* @.str.7, i64 0, i64 0), %1 ]
ret i8* %8
}