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rust/tests/pretty/asm.rs

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Add tests for asm!
2020-02-20 03:19:48 -06:00
// pretty-mode:expanded
// pp-exact:asm.pp
pretty/asm.rs should only be tested for x86_64 and not AArch64
2020-06-13 02:41:39 -05:00
// only-x86_64
Add tests for asm!
2020-02-20 03:19:48 -06:00
Stabilize asm! and global_asm! They are also removed from the prelude as per the decision in https://github.com/rust-lang/rust/issues/87228. stdarch and compiler-builtins are updated to work with the new, stable asm! and global_asm! macros.
2021-12-09 18:15:33 -06:00
use std::arch::asm;
Add tests for asm!
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pub fn main() {
let a: i32;
let mut b = 4i32;
unsafe {
asm!("");
asm!("", options());
asm!("", options(nostack, nomem));
asm!("{}", in(reg) 4);
asm!("{0}", out(reg) a);
asm!("{name}", name = inout(reg) b);
asm!("{} {}", out(reg) _, inlateout(reg) b => _);
Be stricter about rejecting LLVM reserved registers in asm!
2021-04-28 10:28:59 -05:00
asm!("", out("al") _, lateout("rcx") _);
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
asm!("inst1", "inst2");
asm!("inst1 {}, 42", "inst2 {}, 24", in(reg) a, out(reg) b);
asm!("inst2 {1}, 24", "inst1 {0}, 42", in(reg) a, out(reg) b);
asm!("inst1 {}, 42", "inst2 {name}, 24", in(reg) a, name = out(reg) b);
Stabilize asm! and global_asm! They are also removed from the prelude as per the decision in https://github.com/rust-lang/rust/issues/87228. stdarch and compiler-builtins are updated to work with the new, stable asm! and global_asm! macros.
2021-12-09 18:15:33 -06:00
asm!(
"inst1
inst2"
);
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
asm!("inst1\ninst2");
asm!("inst1\n\tinst2");
asm!("inst1\ninst2", "inst3\ninst4");
Add tests for asm!
2020-02-20 03:19:48 -06:00
}
}
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