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+ // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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+ // file at the top-level directory of this distribution and at
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+ // http://rust-lang.org/COPYRIGHT.
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+ //
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+ // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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+ // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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+ // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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+ // option. This file may not be copied, modified, or distributed
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+ // except according to those terms.
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+
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+ #![ feature( asm) ]
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+
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+ #[ cfg( any( target_arch = "x86" , target_arch = "x86_64" ) ) ]
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+ fn read ( ptr : & u32 ) -> u32 {
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+ let out: u32 ;
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+ unsafe {
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+ asm ! ( "mov $1, $0" : "=r" ( out) : "*m" ( ptr) ) ;
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+ }
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+ out
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+ }
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+
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+ #[ cfg( any( target_arch = "x86" , target_arch = "x86_64" ) ) ]
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+ fn write ( ptr : & mut u32 , val : u32 ) {
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+ unsafe {
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+ asm ! ( "mov $1, $0" :: "=*m" ( ptr) , "r" ( val) ) ;
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+ }
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+ }
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+
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+ #[ cfg( any( target_arch = "x86" , target_arch = "x86_64" ) ) ]
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+ pub fn main ( ) {
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+ let a = 1 ;
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+ let mut b = 2 ;
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+ assert_eq ! ( read( & a) , 1 ) ;
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+ write ( & mut b, 3 ) ;
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+ assert_eq ! ( b, 3 ) ;
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+ }
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+
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+ #[ cfg( not( any( target_arch = "x86" , target_arch = "x86_64" ) ) ) ]
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+ pub fn main ( ) { }
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