Unable to compile dependency-free bare-bones example - unsupported instruction MCInst 157 #13
Description
Forgive me if the code below makes no sense; I'm kind of wildly experimenting to get something that works. Since libcore doesn't compile, I'm trying this example file:
#![feature(no_std)]
#![feature(no_core)]
#![feature(lang_items)]
#![feature(fundamental)]
#![no_std]
#![no_core]
#![no_main]
const PORTB: *mut u8 = 0x25 as *mut u8;
#[no_mangle]
pub extern fn main(_argc: i32, _argv: *const *const u8) -> i32 {
loop {
unsafe {
*PORTB |= 0x1;
}
}
}
#[lang = "sized"]
#[fundamental]
pub trait Sized {}
#[lang = "copy"]
pub trait Copy : Clone {}
pub trait Clone : Sized {
fn clone(&self) -> Self;
#[inline(always)]
fn clone_from(&mut self, source: &Self) {
*self = source.clone()
}
}Compiled with rustc --target avr-atmel-none hello.rs yields:
'generic' is not a recognized processor for this target (ignoring processor)
LLVM ERROR: Not supported instr: <MCInst 157 <MCOperand Reg:51> <MCOperand Imm:11> <MCOperand Reg:49>>
The intermediate LLVM IR is
; ModuleID = 'hello.0.rs'
target datalayout = "e-p:16:8:8-i8:8:8-i16:8:8-i32:8:8-i64:8:8-f32:8:8-f64:8:8-n8"
target triple = "avr-atmel-none"
@const141 = internal unnamed_addr constant i8* inttoptr (i16 37 to i8*)
@const142 = internal unnamed_addr constant i8 1
define i32 @main(i32, i8**) unnamed_addr {
"the block":
%2 = alloca i32
store i32 %0, i32* %2
%3 = load i32, i32* %2
%4 = alloca i8**
store i8** %1, i8*** %4
%5 = load i8**, i8*** %4
%6 = call i32 @_ZN4main10__rust_abiE(i32 %3, i8** %5)
ret i32 %6
}
; Function Attrs: uwtable
define internal i32 @_ZN4main10__rust_abiE(i32, i8**) unnamed_addr #0 {
entry-block:
%sret_slot = alloca i32
%dropflag_hint_11 = alloca i8
%dropflag_hint_14 = alloca i8
%_argc = alloca i32
%_argv = alloca i8**
store i8 61, i8* %dropflag_hint_11
store i8 61, i8* %dropflag_hint_14
store i32 %0, i32* %_argc, align 1
store i8** %1, i8*** %_argv, align 1
br label %loop_body
loop_exit: ; No predecessors!
unreachable
loop_body: ; preds = %loop_body, %entry-block
%2 = load i8, i8* inttoptr (i16 37 to i8*), align 1
%3 = or i8 %2, 1
store i8 %3, i8* inttoptr (i16 37 to i8*), align 1
br label %loop_body
}
attributes #0 = { uwtable }Version information
rustc 1.4.0-dev (f841b21fa 2015-09-06)
binary: rustc
commit-hash: f841b21fa4578dc379adad79f1af66b201154b5e
commit-date: 2015-09-06
host: x86_64-apple-darwin
release: 1.4.0-dev