__attribute__((no, noclone)) unsigned __int128 t155_5sub(unsigned __int128 x) {
  unsigned __int128 r;
  if (__builtin_sub_overflow(
          x,
          (signed __int128)((
              (signed __int128)(((unsigned __int128)1 << (16 * 8 - 1)) - 1))),
          &r))
    bar();
  return r;
}


x86 assembly (clang, -O0):
<t155_5sub>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x20(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x20(%rbp),%rax
mov    -0x18(%rbp),%rcx
mov    %rcx,-0x28(%rbp)
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rdx
mov    -0x28(%rbp),%rcx
xor    %eax,%eax
add    $0x1,%rdx
movabs $0x8000000000000000,%rsi
adc    %rsi,%rcx
mov    %eax,%r9d
mov    %r9,%r8
adc    $0xffffffffffffffff,%r8
adc    $0xffffffffffffffff,%r9
mov    %r8d,%eax
and    $0x1,%eax
mov    %eax,%esi
mov    %rsi,%rax
neg    %rax
mov    %rax,%rdi
xor    %r9,%rdi
xor    %r8,%rax
or     %rdi,%rax
or     %rsi,%rax
setne  %al
mov    %rdx,-0x40(%rbp)
mov    %rcx,-0x38(%rbp)
test   $0x1,%al
jne    118e <t155_5sub+0x7e>
jmp    1195 <t155_5sub+0x85>
mov    $0x0,%al
call   1030 <bar@plt>
mov    -0x40(%rbp),%rax
mov    -0x38(%rbp),%rcx
mov    %rcx,-0x8(%rbp)
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    -0x8(%rbp),%rdx
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<t155_5sub>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
add    $0x1,%r14
movabs $0x8000000000000000,%rbx
adc    %rsi,%rbx
mov    $0xfffffffffffffffe,%rax
cmp    %rdi,%rax
movabs $0x7fffffffffffffff,%rax
ff ff 7f
sbb    %rsi,%rax
jb     1148 <t155_5sub+0x38>
xor    %eax,%eax
call   1030 <bar@plt>
mov    %r14,%rax
mov    %rbx,%rdx
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define { i64, i64 } @t155_5sub(i64 %0, i64 %1) {
%3 = alloca i128
%4 = alloca i128
%5 = alloca i128
%6 = alloca i128
%7 = bitcast i128* %4 to { i64, i64 }*
%8 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %7, i32 0, i32 0
store i64 %0, i64* %8
%9 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %7, i32 0, i32 1
store i64 %1, i64* %9
%10 = load i128, i128* %4
store i128 %10, i128* %5
%11 = load i128, i128* %5
%12 = zext i128 %11 to i129
%13 = call { i129, i1 } @llvm.ssub.with.overflow.i129(i129 %12, i129 170141183460469231731687303715884105727)
%14 = extractvalue { i129, i1 } %13, 1
%15 = extractvalue { i129, i1 } %13, 0
%16 = trunc i129 %15 to i128
%17 = zext i128 %16 to i129
%18 = icmp ne i129 %15, %17
%19 = or i1 %14, %18
store i128 %16, i128* %6
br i1 %19, label %20, label %22
20: ; preds = %2
%21 = call i32 (...) @bar()
br label %22
22: ; preds = %20, %2
%23 = load i128, i128* %6
store i128 %23, i128* %3
%24 = bitcast i128* %3 to { i64, i64 }*
%25 = load { i64, i64 }, { i64, i64 }* %24
ret { i64, i64 } %25
}

LLVM IR (-O2):
define { i64, i64 } @t155_5sub(i64 %0, i64 %1) {
%3 = zext i64 %1 to i128
%4 = shl nuw i128 %3, 64
%5 = zext i64 %0 to i128
%6 = or i128 %4, %5
%7 = zext i128 %6 to i129
%8 = add nsw i129 %7, -170141183460469231731687303715884105727
%9 = icmp ult i128 %6, 170141183460469231731687303715884105727
br i1 %9, label %10, label %12
10: ; preds = %2
%11 = tail call i32 (...) @bar()
br label %12
12: ; preds = %10, %2
%13 = trunc i129 %8 to i64
%14 = lshr i129 %8, 64
%15 = trunc i129 %14 to i64
%16 = insertvalue { i64, i64 } poison, i64 %13, 0
%17 = insertvalue { i64, i64 } %16, i64 %15, 1
ret { i64, i64 } %17
}