const char *beri_debug_strerror(int ret) {
  switch (ret) {
  case 0:
    return ("success");
  case 1:
    return ("socket()");
  case 2:
    return ("connect()");
  case 3:
    return ("send()");
  case 4:
    return ("breakpoint bounds error");
  case 5:
    return ("register bounds error");
  case 6:
    return ("immediate value bounds error");
  case 7:
    return ("unexpected data in reply");
  case 8:
    return ("payload too big");
  case 9:
    return ("invalid address");
  case 10:
    return ("unsupported debug operation");
  case 11:
    return ("exception fired");
  case 12:
    return ("breakpoint has not fired");
  case 13:
    return ("open()");
  case 14:
    return ("stat()/fstat()");
  case 15:
    return ("read()");
  case 16:
    return ("socketpair()");
  case 17:
    return ("fork()");
  case 18:
    return ("couldn't allocate memory");
  case 19:
    return ("invalid number of instructions to trace");
  case 20:
    return ("pipeline not paused");
  case 21:
    return ("Unexpected Response from HW");
  case 22:
    return ("data stream is incomplete");
  case 23:
    return ("Altera tools returned an error");
  case 24:
    return ("berictl was built without PCI Express support");
  default:
    return ("unknown error");
  }
}


x86 assembly (clang, -O0):
<beri_debug_strerror>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x18,%rax
ja     12bc <beri_debug_strerror+0x1bc>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf31(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf29(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf22(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf1c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf13(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf1b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf21(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf2e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf37(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf37(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf37(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf4c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf42(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf39(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf36(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf2d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf36(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf4e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf52(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf5e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf68(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf77(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    12c7 <beri_debug_strerror+0x1c7>
lea    0xf95(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<beri_debug_strerror>:
cmp    $0x18,%edi
ja     1117 <beri_debug_strerror+0x17>
movslq %edi,%rax
lea    0x10f5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0x10d6(%rip),%rax
ret

LLVM IR (-O0):
@.str = [8 x i8] c"success\00"
@.str.1 = [9 x i8] c"socket()\00"
@.str.2 = [10 x i8] c"connect()\00"
@.str.3 = [7 x i8] c"send()\00"
@.str.4 = [24 x i8] c"breakpoint bounds error\00"
@.str.5 = [22 x i8] c"register bounds error\00"
@.str.6 = [29 x i8] c"immediate value bounds error\00"
@.str.7 = [25 x i8] c"unexpected data in reply\00"
@.str.8 = [16 x i8] c"payload too big\00"
@.str.9 = [16 x i8] c"invalid address\00"
@.str.10 = [28 x i8] c"unsupported debug operation\00"
@.str.11 = [16 x i8] c"exception fired\00"
@.str.12 = [25 x i8] c"breakpoint has not fired\00"
@.str.13 = [7 x i8] c"open()\00"
@.str.14 = [15 x i8] c"stat()/fstat()\00"
@.str.15 = [7 x i8] c"read()\00"
@.str.16 = [13 x i8] c"socketpair()\00"
@.str.17 = [7 x i8] c"fork()\00"
@.str.18 = [25 x i8] c"couldn't allocate memory\00"
@.str.19 = [40 x i8] c"invalid number of instructions to trace\00"
@.str.20 = [20 x i8] c"pipeline not paused\00"
@.str.21 = [28 x i8] c"Unexpected Response from HW\00"
@.str.22 = [26 x i8] c"data stream is incomplete\00"
@.str.23 = [31 x i8] c"Altera tools returned an error\00"
@.str.24 = [46 x i8] c"berictl was built without PCI Express support\00"
@.str.25 = [14 x i8] c"unknown error\00"
define i8* @beri_debug_strerror(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %30 [
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
i32 7, label %12
i32 8, label %13
i32 9, label %14
i32 10, label %15
i32 11, label %16
i32 12, label %17
i32 13, label %18
i32 14, label %19
i32 15, label %20
i32 16, label %21
i32 17, label %22
i32 18, label %23
i32 19, label %24
i32 20, label %25
i32 21, label %26
i32 22, label %27
i32 23, label %28
i32 24, label %29
]
5: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0), i8** %2
br label %31
6: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %31
7: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %31
8: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %31
9: ; preds = %1
store i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %31
10: ; preds = %1
store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %31
11: ; preds = %1
store i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %31
12: ; preds = %1
store i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %31
13: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %31
14: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %31
15: ; preds = %1
store i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %31
16: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %31
17: ; preds = %1
store i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %31
18: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %31
19: ; preds = %1
store i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %31
20: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %31
21: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %31
22: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %31
23: ; preds = %1
store i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %31
24: ; preds = %1
store i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str.19, i64 0, i64 0), i8** %2
br label %31
25: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.20, i64 0, i64 0), i8** %2
br label %31
26: ; preds = %1
store i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.21, i64 0, i64 0), i8** %2
br label %31
27: ; preds = %1
store i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.22, i64 0, i64 0), i8** %2
br label %31
28: ; preds = %1
store i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.23, i64 0, i64 0), i8** %2
br label %31
29: ; preds = %1
store i8* getelementptr inbounds ([46 x i8], [46 x i8]* @.str.24, i64 0, i64 0), i8** %2
br label %31
30: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.25, i64 0, i64 0), i8** %2
br label %31
31: ; preds = %30, %29, %28, %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%32 = load i8*, i8** %2
ret i8* %32
}

LLVM IR (-O2):
@.str = [8 x i8] c"success\00"
@.str.1 = [9 x i8] c"socket()\00"
@.str.2 = [10 x i8] c"connect()\00"
@.str.3 = [7 x i8] c"send()\00"
@.str.4 = [24 x i8] c"breakpoint bounds error\00"
@.str.5 = [22 x i8] c"register bounds error\00"
@.str.6 = [29 x i8] c"immediate value bounds error\00"
@.str.7 = [25 x i8] c"unexpected data in reply\00"
@.str.8 = [16 x i8] c"payload too big\00"
@.str.9 = [16 x i8] c"invalid address\00"
@.str.10 = [28 x i8] c"unsupported debug operation\00"
@.str.11 = [16 x i8] c"exception fired\00"
@.str.12 = [25 x i8] c"breakpoint has not fired\00"
@.str.13 = [7 x i8] c"open()\00"
@.str.14 = [15 x i8] c"stat()/fstat()\00"
@.str.15 = [7 x i8] c"read()\00"
@.str.16 = [13 x i8] c"socketpair()\00"
@.str.17 = [7 x i8] c"fork()\00"
@.str.18 = [25 x i8] c"couldn't allocate memory\00"
@.str.19 = [40 x i8] c"invalid number of instructions to trace\00"
@.str.20 = [20 x i8] c"pipeline not paused\00"
@.str.21 = [28 x i8] c"Unexpected Response from HW\00"
@.str.22 = [26 x i8] c"data stream is incomplete\00"
@.str.23 = [31 x i8] c"Altera tools returned an error\00"
@.str.24 = [46 x i8] c"berictl was built without PCI Express support\00"
@.str.25 = [14 x i8] c"unknown error\00"
@reltable.beri_debug_strerror = [25 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.1 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.2 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.3 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([24 x i8]* @.str.4 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([22 x i8]* @.str.5 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([29 x i8]* @.str.6 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([25 x i8]* @.str.7 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.8 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.9 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([28 x i8]* @.str.10 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.11 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([25 x i8]* @.str.12 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.13 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @.str.14 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.15 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.16 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.17 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([25 x i8]* @.str.18 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([40 x i8]* @.str.19 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.20 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([28 x i8]* @.str.21 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([26 x i8]* @.str.22 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([31 x i8]* @.str.23 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([46 x i8]* @.str.24 to i64), i64 ptrtoint ([25 x i32]* @reltable.beri_debug_strerror to i64)) to i32)]
define i8* @beri_debug_strerror(i32 %0) {
%2 = icmp ult i32 %0, 25
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 ([25 x i32]* @reltable.beri_debug_strerror 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.25, i64 0, i64 0), %1 ]
ret i8* %8
}