const char *voc_encoding2str(int encoding) {
  switch (encoding) {
  case 0:
    return "8 bit unsigned PCM";
  case 4:
    return "16 bit signed PCM";
  case 6:
    return "A-law";
  case 7:
    return "u-law";
  default:
    break;
  }
  return "*** Unknown ***";
}


x86 assembly (clang, -O0):
<voc_encoding2str>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x7,%rax
ja     116c <voc_encoding2str+0x6c>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xeed(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117c <voc_encoding2str+0x7c>
lea    0xef0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117c <voc_encoding2str+0x7c>
lea    0xef2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117c <voc_encoding2str+0x7c>
lea    0xee8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117c <voc_encoding2str+0x7c>
jmp    1171 <voc_encoding2str+0x71>
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<voc_encoding2str>:
cmp    $0x7,%edi
ja     1117 <voc_encoding2str+0x17>
movslq %edi,%rax
lea    0xf35(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf13(%rip),%rax
ret

LLVM IR (-O0):
@.str = [19 x i8] c"8 bit unsigned PCM\00"
@.str.1 = [18 x i8] c"16 bit signed PCM\00"
@.str.2 = [6 x i8] c"A-law\00"
@.str.3 = [6 x i8] c"u-law\00"
@.str.4 = [16 x i8] c"*** Unknown ***\00"
define i8* @voc_encoding2str(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 4, label %6
i32 6, label %7
i32 7, label %8
]
5: ; preds = %1
store i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), i8** %2
br label %11
6: ; preds = %1
store i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %11
7: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %11
8: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %11
9: ; preds = %1
br label %10
10: ; preds = %9
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %11
11: ; preds = %10, %8, %7, %6, %5
%12 = load i8*, i8** %2
ret i8* %12
}

LLVM IR (-O2):
@.str = [19 x i8] c"8 bit unsigned PCM\00"
@.str.1 = [18 x i8] c"16 bit signed PCM\00"
@.str.2 = [6 x i8] c"A-law\00"
@.str.3 = [6 x i8] c"u-law\00"
@.str.4 = [16 x i8] c"*** Unknown ***\00"
@reltable.voc_encoding2str = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([18 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.voc_encoding2str to i64)) to i32)]
define i8* @voc_encoding2str(i32 %0) {
%2 = icmp ult i32 %0, 8
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 ([8 x i32]* @reltable.voc_encoding2str to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([16 x i8], [16 x i8]* @.str.4, i64 0, i64 0), %1 ]
ret i8* %8
}