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for signed wrapping remainder, do not compare lhs with MIN #89351

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Oct 6, 2021
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for signed wrapping remainder, do not compare lhs with MIN #89351

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10 changes: 4 additions & 6 deletions library/core/src/num/int_macros.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1533,9 +1533,8 @@ macro_rules! int_impl {
#[must_use = "this returns the result of the operation, \
without modifying the original"]
pub const fn overflowing_rem(self, rhs: Self) -> (Self, bool) {
// Using `&` helps LLVM see that it is the same check made in division.
if unlikely!((self == Self::MIN) & (rhs == -1)) {
(0, true)
if unlikely!(rhs == -1) {
(0, self == Self::MIN)
} else {
(self % rhs, false)
}
Expand Down Expand Up @@ -1565,9 +1564,8 @@ macro_rules! int_impl {
without modifying the original"]
#[inline]
pub const fn overflowing_rem_euclid(self, rhs: Self) -> (Self, bool) {
// Using `&` helps LLVM see that it is the same check made in division.
if unlikely!((self == Self::MIN) & (rhs == -1)) {
(0, true)
if unlikely!(rhs == -1) {
(0, self == Self::MIN)
} else {
(self.rem_euclid(rhs), false)
}
Expand Down