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wrapping shift: remove first bitmask and table #143355

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merged 1 commit into from
Jul 16, 2025
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wrapping shift: remove first bitmask and table #143355

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48 changes: 6 additions & 42 deletions library/core/src/num/wrapping.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -94,9 +94,9 @@ macro_rules! sh_impl_signed {
#[inline]
fn shl(self, other: $f) -> Wrapping<$t> {
if other < 0 {
Wrapping(self.0.wrapping_shr((-other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shr(-other as u32))
} else {
Wrapping(self.0.wrapping_shl((other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shl(other as u32))
}
}
}
Expand All @@ -119,9 +119,9 @@ macro_rules! sh_impl_signed {
#[inline]
fn shr(self, other: $f) -> Wrapping<$t> {
if other < 0 {
Wrapping(self.0.wrapping_shl((-other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shl(-other as u32))
} else {
Wrapping(self.0.wrapping_shr((other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shr(other as u32))
}
}
}
Expand All @@ -147,7 +147,7 @@ macro_rules! sh_impl_unsigned {

#[inline]
fn shl(self, other: $f) -> Wrapping<$t> {
Wrapping(self.0.wrapping_shl((other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shl(other as u32))
}
}
forward_ref_binop! { impl Shl, shl for Wrapping<$t>, $f,
Expand All @@ -168,7 +168,7 @@ macro_rules! sh_impl_unsigned {

#[inline]
fn shr(self, other: $f) -> Wrapping<$t> {
Wrapping(self.0.wrapping_shr((other & self::shift_max::$t as $f) as u32))
Wrapping(self.0.wrapping_shr(other as u32))
}
}
forward_ref_binop! { impl Shr, shr for Wrapping<$t>, $f,
Expand Down Expand Up @@ -1052,39 +1052,3 @@ macro_rules! wrapping_int_impl_unsigned {
}

wrapping_int_impl_unsigned! { usize u8 u16 u32 u64 u128 }

mod shift_max {
#![allow(non_upper_case_globals)]

#[cfg(target_pointer_width = "16")]
mod platform {
pub(crate) const usize: u32 = super::u16;
pub(crate) const isize: u32 = super::i16;
}

#[cfg(target_pointer_width = "32")]
mod platform {
pub(crate) const usize: u32 = super::u32;
pub(crate) const isize: u32 = super::i32;
}

#[cfg(target_pointer_width = "64")]
mod platform {
pub(crate) const usize: u32 = super::u64;
pub(crate) const isize: u32 = super::i64;
}

pub(super) const i8: u32 = (1 << 3) - 1;
pub(super) const i16: u32 = (1 << 4) - 1;
pub(super) const i32: u32 = (1 << 5) - 1;
pub(super) const i64: u32 = (1 << 6) - 1;
pub(super) const i128: u32 = (1 << 7) - 1;
pub(super) use self::platform::isize;

pub(super) const u8: u32 = i8;
pub(super) const u16: u32 = i16;
pub(super) const u32: u32 = i32;
pub(super) const u64: u32 = i64;
pub(super) const u128: u32 = i128;
pub(super) use self::platform::usize;
}
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