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Inline ASM: Registers in the dreg_low16 register class fail cause compilation failures when the d32 target feature is disabled #126797
Description
I tried this code, compiled for the armv7-unknown-linux-gnueabihf target:
// Fails to compile
fn f(x: f64) {
unsafe {
let out: f64;
std::arch::asm!("vmov.f64 d1, d0", out("d1") out, in("d0") x);
}
}I expected to see this happen: Successful compilation, as the following code successfully compiles, and d0 and d1 are members of the dreg_low16 register class:
// Successfully compiles
fn f(x: f64) {
unsafe {
let out: f64;
std::arch::asm!("vmov.f64 {}, {}", out(dreg_low16) out, in(dreg_low16) x);
}
}Instead, this happened: Compilation fails with the following error message:
error: register class `dreg` requires the `d32` target feature
--> <source>:5:44
|
5 | std::arch::asm!("vmov.f64 d1, d0", out("d1") out, in("d0") x);
| ^^^^^^^^^^^^^
error: register class `dreg` requires the `d32` target feature
--> <source>:5:59
|
5 | std::arch::asm!("vmov.f64 d1, d0", out("d1") out, in("d0") x);
| ^^^^^^^^^^
error: aborting due to 2 previous errors
Meta
rustc --version --verbose:
rustc 1.81.0-nightly (d8a38b000 2024-06-19)
binary: rustc
commit-hash: d8a38b00024cd7156dea4ce8fd8ae113a2745e7f
commit-date: 2024-06-19
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7
Activity
beetrees commentedon Jun 21, 2024
@rustbot label +A-inline-assembly +O-Arm
Rollup merge of rust-lang#126849 - workingjubilee:correctly-classify-…
Rollup merge of rust-lang#126849 - workingjubilee:correctly-classify-…
Unrolled build for rust-lang#126849