const char *mscgen_error2str(int code) {
  switch (code) {
  case (0):
    return "OK";
  case (-1):
    return "FILE ERROR";
  case (-2):
    return "INPUT FORMAT ERROR";
  case (-3):
    return "OUTPUT CONTEXT ERROR";
  default:
    return "UNKNOWN_ERROR";
  }
}


x86 assembly (clang, -O0):
<mscgen_error2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0x3,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x3,%eax
ja     1170 <mscgen_error2str+0x70>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <mscgen_error2str+0x7b>
lea    0xecc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <mscgen_error2str+0x7b>
lea    0xec7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <mscgen_error2str+0x7b>
lea    0xeca(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <mscgen_error2str+0x7b>
lea    0xecf(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<mscgen_error2str>:
add    $0x3,%edi
cmp    $0x3,%edi
ja     111a <mscgen_error2str+0x1a>
movslq %edi,%rax
lea    0xf32(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf15(%rip),%rax
ret

LLVM IR (-O0):
@.str = [3 x i8] c"OK\00"
@.str.1 = [11 x i8] c"FILE ERROR\00"
@.str.2 = [19 x i8] c"INPUT FORMAT ERROR\00"
@.str.3 = [21 x i8] c"OUTPUT CONTEXT ERROR\00"
@.str.4 = [14 x i8] c"UNKNOWN_ERROR\00"
define i8* @mscgen_error2str(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %9 [
i32 0, label %5
i32 -1, label %6
i32 -2, label %7
i32 -3, label %8
]
5: ; preds = %1
store i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8** %2
br label %10
6: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %10
7: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %10
8: ; preds = %1
store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %10
9: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %10
10: ; preds = %9, %8, %7, %6, %5
%11 = load i8*, i8** %2
ret i8* %11
}

LLVM IR (-O2):
@.str = [3 x i8] c"OK\00"
@.str.1 = [11 x i8] c"FILE ERROR\00"
@.str.2 = [19 x i8] c"INPUT FORMAT ERROR\00"
@.str.3 = [21 x i8] c"OUTPUT CONTEXT ERROR\00"
@.str.4 = [14 x i8] c"UNKNOWN_ERROR\00"
@reltable.mscgen_error2str = [4 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([21 x i8]* @.str.3 to i64), i64 ptrtoint ([4 x i32]* @reltable.mscgen_error2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str.2 to i64), i64 ptrtoint ([4 x i32]* @reltable.mscgen_error2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.1 to i64), i64 ptrtoint ([4 x i32]* @reltable.mscgen_error2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([3 x i8]* @.str to i64), i64 ptrtoint ([4 x i32]* @reltable.mscgen_error2str to i64)) to i32)]
define i8* @mscgen_error2str(i32 %0) {
%2 = add i32 %0, 3
%3 = icmp ult i32 %2, 4
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 ([4 x i32]* @reltable.mscgen_error2str to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), %1 ]
ret i8* %9
}