#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 */

/* Variables and functions */
char *trace_decode_reg(int reg) {
  switch (reg) {
  case 769:
    return "SPRN_MMCR2";
    break;
  case 770:
    return "SPRN_MMCRA";
    break;
  case 779:
    return "SPRN_MMCR0";
    break;
  case 804:
    return "SPRN_EBBHR";
    break;
  case 805:
    return "SPRN_EBBRR";
    break;
  case 806:
    return "SPRN_BESCR";
    break;
  case 800:
    return "SPRN_BESCRS";
    break;
  case 801:
    return "SPRN_BESCRSU";
    break;
  case 802:
    return "SPRN_BESCRR";
    break;
  case 803:
    return "SPRN_BESCRRU";
    break;
  case 771:
    return "SPRN_PMC1";
    break;
  case 772:
    return "SPRN_PMC2";
    break;
  case 773:
    return "SPRN_PMC3";
    break;
  case 774:
    return "SPRN_PMC4";
    break;
  case 775:
    return "SPRN_PMC5";
    break;
  case 776:
    return "SPRN_PMC6";
    break;
  case 780:
    return "SPRN_SIAR";
    break;
  case 781:
    return "SPRN_SDAR";
    break;
  case 768:
    return "SPRN_SIER";
    break;
  }
  return NULL;
}


x86 assembly (clang, -O0):
<trace_decode_reg>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xfffffd00,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x26,%eax
ja     1262 <trace_decode_reg+0x162>
mov    -0x18(%rbp),%rax
lea    0xed7(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf63(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf5e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf59(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf54(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf4f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf4a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf45(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf41(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf3e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf3a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf37(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf31(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf2b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf25(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf1f(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf19(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf13(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf0d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
lea    0xf07(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    126a <trace_decode_reg+0x16a>
movq   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<trace_decode_reg>:
add    $0xfffffd00,%edi
cmp    $0x26,%edi
ja     111a <trace_decode_reg+0x1a>
movslq %edi,%rax
lea    0x2c03(%rip),%rcx
mov    (%rcx,%rax,8),%rax
ret
xor    %eax,%eax
ret

LLVM IR (-O0):
@.str = [11 x i8] c"SPRN_MMCR2\00"
@.str.1 = [11 x i8] c"SPRN_MMCRA\00"
@.str.2 = [11 x i8] c"SPRN_MMCR0\00"
@.str.3 = [11 x i8] c"SPRN_EBBHR\00"
@.str.4 = [11 x i8] c"SPRN_EBBRR\00"
@.str.5 = [11 x i8] c"SPRN_BESCR\00"
@.str.6 = [12 x i8] c"SPRN_BESCRS\00"
@.str.7 = [13 x i8] c"SPRN_BESCRSU\00"
@.str.8 = [12 x i8] c"SPRN_BESCRR\00"
@.str.9 = [13 x i8] c"SPRN_BESCRRU\00"
@.str.10 = [10 x i8] c"SPRN_PMC1\00"
@.str.11 = [10 x i8] c"SPRN_PMC2\00"
@.str.12 = [10 x i8] c"SPRN_PMC3\00"
@.str.13 = [10 x i8] c"SPRN_PMC4\00"
@.str.14 = [10 x i8] c"SPRN_PMC5\00"
@.str.15 = [10 x i8] c"SPRN_PMC6\00"
@.str.16 = [10 x i8] c"SPRN_SIAR\00"
@.str.17 = [10 x i8] c"SPRN_SDAR\00"
@.str.18 = [10 x i8] c"SPRN_SIER\00"
define i8* @trace_decode_reg(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %24 [
i32 769, label %5
i32 770, label %6
i32 779, label %7
i32 804, label %8
i32 805, label %9
i32 806, label %10
i32 800, label %11
i32 801, label %12
i32 802, label %13
i32 803, label %14
i32 771, label %15
i32 772, label %16
i32 773, label %17
i32 774, label %18
i32 775, label %19
i32 776, label %20
i32 780, label %21
i32 781, label %22
i32 768, label %23
]
5: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8** %2
br label %25
6: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %25
7: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %25
8: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %25
9: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %25
10: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %25
11: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %25
12: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %25
13: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %25
14: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %25
15: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %25
16: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %25
17: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %25
18: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %25
19: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %25
20: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %25
21: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %25
22: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %25
23: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %25
24: ; preds = %1
store i8* null, i8** %2
br label %25
25: ; preds = %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%26 = load i8*, i8** %2
ret i8* %26
}

LLVM IR (-O2):
@.str = [11 x i8] c"SPRN_MMCR2\00"
@.str.1 = [11 x i8] c"SPRN_MMCRA\00"
@.str.2 = [11 x i8] c"SPRN_MMCR0\00"
@.str.3 = [11 x i8] c"SPRN_EBBHR\00"
@.str.4 = [11 x i8] c"SPRN_EBBRR\00"
@.str.5 = [11 x i8] c"SPRN_BESCR\00"
@.str.6 = [12 x i8] c"SPRN_BESCRS\00"
@.str.7 = [13 x i8] c"SPRN_BESCRSU\00"
@.str.8 = [12 x i8] c"SPRN_BESCRR\00"
@.str.9 = [13 x i8] c"SPRN_BESCRRU\00"
@.str.10 = [10 x i8] c"SPRN_PMC1\00"
@.str.11 = [10 x i8] c"SPRN_PMC2\00"
@.str.12 = [10 x i8] c"SPRN_PMC3\00"
@.str.13 = [10 x i8] c"SPRN_PMC4\00"
@.str.14 = [10 x i8] c"SPRN_PMC5\00"
@.str.15 = [10 x i8] c"SPRN_PMC6\00"
@.str.16 = [10 x i8] c"SPRN_SIAR\00"
@.str.17 = [10 x i8] c"SPRN_SDAR\00"
@.str.18 = [10 x i8] c"SPRN_SIER\00"
@switch.table.trace_decode_reg = [39 x i8*] [i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.18, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.11, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.12, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.14, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.15, i64 0, i64 0), i8* null, i8* null, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.16, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.17, i64 0, i64 0), i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* null, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.6, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.8, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.4, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.5, i64 0, i64 0)]
define i8* @trace_decode_reg(i32 %0) {
%2 = add i32 %0, -768
%3 = icmp ult i32 %2, 39
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = getelementptr inbounds [39 x i8*], [39 x i8*]* @switch.table.trace_decode_reg, i64 0, i64 %5
%7 = load i8*, i8** %6
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ null, %1 ]
ret i8* %9
}