bjoernager/rust
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implement contains_zero method

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This commit is contained in:
Andreas Liljeqvist 2021-08-23 14:20:38 +02:00
parent d50abd0249
commit 70433955f4
3 changed files with 12 additions and 9 deletions
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12
compiler/rustc_target/src/abi/mod.rs
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@ -688,7 +688,7 @@ impl Primitive {
///
/// This is intended specifically to mirror LLVM’s `!range` metadata,
/// semantics.
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
#[derive(HashStable_Generic)]
pub struct AllocationRange {
pub start: u128,
@ -705,6 +705,13 @@ impl AllocationRange {
self.start <= v || v <= self.end
}
}
/// Returns `true` if zero is contained in the range.
/// Equal to `range.contains(0)` but should be faster.
#[inline]
pub fn contains_zero(&self) -> bool {
!(self.start <= self.end && self.start != 0)
}
}
/// Information about one scalar component of a Rust type.
@ -1222,9 +1229,8 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
{
let scalar_allows_raw_init = move |s: &Scalar| -> bool {
if zero {
let range = &s.valid_range;
// The range must contain 0.
range.contains(0) || (range.start > range.end) // wrap-around allows 0
s.valid_range.contains_zero()
} else {
// The range must include all values. `valid_range_exclusive` handles
// the wrap-around using target arithmetic; with wrap-around then the full