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//! `i386` intrinsics
use crate::arch::asm;
/// Reads EFLAGS.
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=__readeflags)
#[cfg(target_arch = "x86")]
#[inline(always)]
#[stable(feature = "simd_x86", since = "1.27.0")]
#[deprecated(
since = "1.29.0",
note = "See issue #51810 - use inline assembly instead"
)]
#[doc(hidden)]
pub unsafe fn __readeflags() -> u32 {
let eflags: u32;
asm!("pushfd", "pop {}", out(reg) eflags, options(nomem, att_syntax));
eflags
}
/// Reads EFLAGS.
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=__readeflags)
#[cfg(target_arch = "x86_64")]
#[inline(always)]
#[stable(feature = "simd_x86", since = "1.27.0")]
#[deprecated(
since = "1.29.0",
note = "See issue #51810 - use inline assembly instead"
)]
#[doc(hidden)]
pub unsafe fn __readeflags() -> u64 {
let eflags: u64;
asm!("pushfq", "pop {}", out(reg) eflags, options(nomem, att_syntax));
eflags
}
/// Write EFLAGS.
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=__writeeflags)
#[cfg(target_arch = "x86")]
#[inline(always)]
#[stable(feature = "simd_x86", since = "1.27.0")]
#[deprecated(
since = "1.29.0",
note = "See issue #51810 - use inline assembly instead"
)]
#[doc(hidden)]
pub unsafe fn __writeeflags(eflags: u32) {
asm!("push {}", "popfd", in(reg) eflags, options(nomem, att_syntax));
}
/// Write EFLAGS.
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=__writeeflags)
#[cfg(target_arch = "x86_64")]
#[inline(always)]
#[stable(feature = "simd_x86", since = "1.27.0")]
#[deprecated(
since = "1.29.0",
note = "See issue #51810 - use inline assembly instead"
)]
#[doc(hidden)]
pub unsafe fn __writeeflags(eflags: u64) {
asm!("push {}", "popfq", in(reg) eflags, options(nomem, att_syntax));
}
#[cfg(test)]
mod tests {
use crate::core_arch::x86::*;
#[test]
#[allow(deprecated)]
fn test_eflags() {
unsafe {
// reads eflags, writes them back, reads them again,
// and compare for equality:
let v = __readeflags();
__writeeflags(v);
let u = __readeflags();
assert_eq!(v, u);
}
}
}
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