#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int uint32_t;

/* Variables and functions */
const char *decode_compare_func(uint32_t op) {
  switch (op & 0x7) {
  case 0:
    return "always";
  case 1:
    return "never";
  case 2:
    return "less";
  case 3:
    return "equal";
  case 4:
    return "lequal";
  case 5:
    return "greater";
  case 6:
    return "notequal";
  case 7:
    return "gequal";
  }
  return "";
}


x86 assembly (clang, -O0):
<decode_compare_func>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
and    $0x7,%eax
mov    %rax,-0x18(%rbp)
sub    $0x7,%eax
ja     11ae <decode_compare_func+0xae>
mov    -0x18(%rbp),%rax
lea    0xedb(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xeeb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xee2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xee6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xebd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xeb4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xeac(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b9 <decode_compare_func+0xb9>
lea    0xe9b(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<decode_compare_func>:
and    $0x7,%edi
lea    0xf2a(%rip),%rcx
movslq (%rcx,%rdi,4),%rax
add    %rcx,%rax
ret

LLVM IR (-O0):
@.str = [7 x i8] c"always\00"
@.str.1 = [6 x i8] c"never\00"
@.str.2 = [5 x i8] c"less\00"
@.str.3 = [6 x i8] c"equal\00"
@.str.4 = [7 x i8] c"lequal\00"
@.str.5 = [8 x i8] c"greater\00"
@.str.6 = [9 x i8] c"notequal\00"
@.str.7 = [7 x i8] c"gequal\00"
@.str.8 = [1 x i8] zeroinitializer
define i8* @decode_compare_func(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
%5 = and i32 %4, 7
switch i32 %5, label %14 [
i32 0, label %6
i32 1, label %7
i32 2, label %8
i32 3, label %9
i32 4, label %10
i32 5, label %11
i32 6, label %12
i32 7, label %13
]
6: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8** %2
br label %15
7: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %15
8: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %15
9: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %15
10: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %15
11: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %15
12: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %15
13: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %15
14: ; preds = %1
store i8* getelementptr inbounds ([1 x i8], [1 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %15
15: ; preds = %14, %13, %12, %11, %10, %9, %8, %7, %6
%16 = load i8*, i8** %2
ret i8* %16
}

LLVM IR (-O2):
@.str = [7 x i8] c"always\00"
@.str.1 = [6 x i8] c"never\00"
@.str.2 = [5 x i8] c"less\00"
@.str.3 = [6 x i8] c"equal\00"
@.str.4 = [7 x i8] c"lequal\00"
@.str.5 = [8 x i8] c"greater\00"
@.str.6 = [9 x i8] c"notequal\00"
@.str.7 = [7 x i8] c"gequal\00"
@reltable.decode_compare_func = [8 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.1 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.3 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.4 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.5 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.6 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.7 to i64), i64 ptrtoint ([8 x i32]* @reltable.decode_compare_func to i64)) to i32)]
define i8* @decode_compare_func(i32 %0) {
%2 = and i32 %0, 7
%3 = zext i32 %2 to i64
%4 = shl i64 %3, 2
%5 = call i8* @llvm.load.relative.i64(i8* bitcast ([8 x i32]* @reltable.decode_compare_func to i8*), i64 %4)
ret i8* %5
}