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auto merge of #16606 : pczarn/rust/inline-asm, r=alexcrichton
It's unfortunate that the read+write operands need special treatment in the AST. A separate vec for all expressions is an alternative, but it doesn't play nicely with trans. Fixes #14936
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#![feature(asm, macro_rules)] | ||
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type History = Vec<&'static str>; | ||
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fn wrap<A>(x:A, which: &'static str, history: &mut History) -> A { | ||
history.push(which); | ||
x | ||
} | ||
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macro_rules! demo { | ||
( $output_constraint:tt ) => { | ||
{ | ||
let mut x: int = 0; | ||
let y: int = 1; | ||
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let mut history: History = vec!(); | ||
unsafe { | ||
asm!("mov ($1), $0" | ||
: $output_constraint (*wrap(&mut x, "out", &mut history)) | ||
: "r"(&wrap(y, "in", &mut history))); | ||
} | ||
assert_eq!((x,y), (1,1)); | ||
assert_eq!(history.as_slice(), &["out", "in"]); | ||
} | ||
} | ||
} | ||
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#[cfg(target_arch = "x86")] | ||
#[cfg(target_arch = "x86_64")] | ||
fn main() { | ||
fn out_write_only_expr_then_in_expr() { | ||
demo!("=r") | ||
} | ||
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fn out_read_write_expr_then_in_expr() { | ||
demo!("+r") | ||
} | ||
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out_write_only_expr_then_in_expr(); | ||
out_read_write_expr_then_in_expr(); | ||
} | ||
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#[cfg(not(target_arch = "x86"), not(target_arch = "x86_64"))] | ||
pub fn main() {} |