2020-02-20 03:19:48 -06:00
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#![feature(prelude_import)]
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#![no_std]
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#[prelude_import]
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2021-02-17 08:52:31 -06:00
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use ::std::prelude::rust_2015::*;
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2020-02-20 03:19:48 -06:00
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#[macro_use]
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extern crate std;
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// pretty-mode:expanded
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// pp-exact:asm.pp
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2020-06-13 02:41:39 -05:00
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// only-x86_64
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2020-02-20 03:19:48 -06:00
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2021-12-09 18:15:33 -06:00
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use std::arch::asm;
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2020-02-20 03:19:48 -06:00
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pub fn main() {
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let a: i32;
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let mut b = 4i32;
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unsafe {
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asm!("");
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asm!("");
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asm!("", options(nomem, nostack));
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asm!("{0}", in(reg) 4);
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asm!("{0}", out(reg) a);
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asm!("{0}", inout(reg) b);
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asm!("{0} {1}", out(reg) _, inlateout(reg) b => _);
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2021-04-28 10:28:59 -05:00
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asm!("", out("al") _, lateout("rcx") _);
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asm: Allow multiple template strings; interpret them as newline-separated
Allow the `asm!` macro to accept a series of template arguments, and
interpret them as if they were concatenated with a '\n' between them.
This allows writing an `asm!` where each line of assembly appears in a
separate template string argument.
This syntax makes it possible for rustfmt to reliably format and indent
each line of assembly, without risking changes to the inside of a
template string. It also avoids the complexity of having the user
carefully format and indent a multi-line string (including where to put
the surrounding quotes), and avoids the extra indentation and lines of a
call to `concat!`.
For example, rewriting the second example from the [blog post on the new
inline assembly
syntax](https://blog.rust-lang.org/inside-rust/2020/06/08/new-inline-asm.html)
using multiple template strings:
```rust
fn main() {
let mut bits = [0u8; 64];
for value in 0..=1024u64 {
let popcnt;
unsafe {
asm!(
" popcnt {popcnt}, {v}",
"2:",
" blsi rax, {v}",
" jz 1f",
" xor {v}, rax",
" tzcnt rax, rax",
" stosb",
" jmp 2b",
"1:",
v = inout(reg) value => _,
popcnt = out(reg) popcnt,
out("rax") _, // scratch
inout("rdi") bits.as_mut_ptr() => _,
);
}
println!("bits of {}: {:?}", value, &bits[0..popcnt]);
}
}
```
Note that all the template strings must appear before all other
arguments; you cannot, for instance, provide a series of template
strings intermixed with the corresponding operands.
In order to get srcloc mappings right for macros that generate
multi-line string literals, create one line_span for each
line in the string literal, each pointing to the macro.
Make `rustc_parse_format::Parser::curarg` `pub`, so that we can
propagate it from one template string argument to the next.
2020-06-15 01:33:55 -05:00
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asm!("inst1\ninst2");
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asm!("inst1 {0}, 42\ninst2 {1}, 24", in(reg) a, out(reg) b);
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asm!("inst2 {1}, 24\ninst1 {0}, 42", in(reg) a, out(reg) b);
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asm!("inst1 {0}, 42\ninst2 {1}, 24", in(reg) a, out(reg) b);
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asm!("inst1\ninst2");
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asm!("inst1\ninst2");
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asm!("inst1\n\tinst2");
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asm!("inst1\ninst2\ninst3\ninst4");
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2020-02-20 03:19:48 -06:00
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}
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}
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