ICE in trans: not immediate: OperandRef(Ref(([16 x i8]*: %_4 = alloca [16 x i8]), AbiAligned) @ [u8; 16])

[mrhota]

Produced by running the code in #13366.

error: internal compiler error: src/librustc_trans/mir/operand.rs:85: not immediate: OperandRef(Ref(([16 x i8]*:  %_4 = alloca [16 x i8]), AbiAligned) @ [u8; 16])

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:417
stack backtrace:
   0:        0x111104513 - std::sys::imp::backtrace::tracing::imp::unwind_backtrace::h725ad67c9efc8e48
   1:        0x111110e44 - std::panicking::default_hook::{{closure}}::he22ccdb3d6013058
   2:        0x1111109ed - std::panicking::default_hook::h61d415f2381a7336
   3:        0x111113587 - std::panicking::rust_panic_with_hook::h8e6300d8e8aca457
   4:        0x10e69be3a - std::panicking::begin_panic::hc2150baf0d6a01af
   5:        0x10e6b080c - rustc_errors::Handler::bug::h57c185abd1dd57c0
   6:        0x10d54e45c - rustc::session::opt_span_bug_fmt::{{closure}}::h25c56b88ed2090ad
   7:        0x10d54e260 - rustc::session::opt_span_bug_fmt::hfad88d41c12c4335
   8:        0x10d54ddea - rustc::session::bug_fmt::h5de3b8a660f6630f
   9:        0x10c2822eb - rustc_trans::mir::statement::<impl rustc_trans::mir::MirContext<'a, 'tcx>>::trans_statement::hf59362110a2a3d52
  10:        0x10c268c6f - rustc_trans::mir::block::<impl rustc_trans::mir::MirContext<'a, 'tcx>>::trans_block::h597078f273c3252c
  11:        0x10c2665d1 - rustc_trans::mir::trans_mir::h0ca7cf697a92e836
  12:        0x10c28616a - rustc_trans::trans_item::TransItem::define::ha5c452dd6f4912b2
  13:        0x10c208af7 - rustc_trans::base::trans_crate::h70230a0957e27c59
  14:        0x10c05de1f - rustc_driver::driver::phase_4_translate_to_llvm::h9bbad5c9ca48b61a
  15:        0x10c02ff64 - rustc_driver::driver::compile_input::{{closure}}::hb36ce61470c17f50
  16:        0x10c057007 - rustc_driver::driver::phase_3_run_analysis_passes::{{closure}}::ha6edf852b5e78329
  17:        0x10bfbb6ac - rustc::ty::context::TyCtxt::create_and_enter::h7c59cfc34c012022
  18:        0x10c02dffe - rustc_driver::driver::compile_input::hd50a6918443232a0
  19:        0x10c07217e - rustc_driver::run_compiler::h5151bfc01962b066
  20:        0x10bf87938 - std::panicking::try::do_call::h9e86b95d9c931e3d
  21:        0x11111630a - __rust_maybe_catch_panic
  22:        0x10bfb0353 - <F as alloc::boxed::FnBox<A>>::call_box::ha55b035dd9316cf5
  23:        0x11110feb4 - std::sys::imp::thread::Thread::new::thread_start::h80e9dc7cc1dfe0d2
  24:     0x7fffc3725aaa - _pthread_body
  25:     0x7fffc37259f6 - _pthread_start

error: Could not compile `ice_repro`.

Slightly reduced code from other issue is as follows:

#![feature(asm)]
#![allow(unused_assignments)]
#![allow(unused_variables)]

fn print_first_half(arr: [u8; 1]) {
    let out: u64;
    unsafe {
        asm!("movups $1, %xmm0
              pextrq $$0, %xmm0, $0"
              ::"m"(arr));
    }
}

fn main() {
    let arr: [u8; 1] = [0; 1];
    print_first_half(arr);
}

[levex]

No longer reproduces:

$ rustc +nightly -vV
rustc 1.31.0-nightly (77af31408 2018-10-11)
binary: rustc
commit-hash: 77af314083e5acabf9ba5335e47271f35eef2e99
commit-date: 2018-10-11
host: x86_64-unknown-linux-gnu
release: 1.31.0-nightly
LLVM version: 8.0
$ rustc +nightly 40187.rs 
error[E0669]: invalid value for constraint in inline assembly
  --> 40187.rs:8:9
   |
8  | /         asm!("movups $1, %xmm0
9  | |               pextrq $$0, %xmm0, $0"
10 | |               ::"m"(arr));
   | |__________________________^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0669`.

[Amanieu]

Closing for the same reason as #13366.