Optimise fast path of checked_ops with unlikely
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f781babf87
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1 changed files with 43 additions and 27 deletions
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@ -21,6 +21,21 @@ macro_rules! try_opt {
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};
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}
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#[cfg(bootstrap)]
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macro_rules! unlikely {
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($e: expr) => {
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$e
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};
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}
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#[cfg(not(bootstrap))]
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#[allow_internal_unstable(const_likely)]
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macro_rules! unlikely {
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($e: expr) => {
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intrinsics::unlikely($e)
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};
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}
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macro_rules! impl_nonzero_fmt {
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( #[$stability: meta] ( $( $Trait: ident ),+ ) for $Ty: ident ) => {
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$(
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@ -745,7 +760,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_add(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_add(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -787,7 +802,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_sub(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_sub(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -829,7 +844,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_mul(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_mul(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -871,7 +886,7 @@ $EndFeature, "
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without modifying the original"]
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#[inline]
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pub const fn checked_div(self, rhs: Self) -> Option<Self> {
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if rhs == 0 || (self == Self::MIN && rhs == -1) {
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if unlikely!(rhs == 0 || (self == Self::MIN && rhs == -1)) {
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None
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} else {
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// SAFETY: div by zero and by INT_MIN have been checked above
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@ -900,7 +915,7 @@ assert_eq!((1", stringify!($SelfT), ").checked_div_euclid(0), None);
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without modifying the original"]
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#[inline]
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pub const fn checked_div_euclid(self, rhs: Self) -> Option<Self> {
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if rhs == 0 || (self == Self::MIN && rhs == -1) {
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if unlikely!(rhs == 0 || (self == Self::MIN && rhs == -1)) {
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None
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} else {
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Some(self.div_euclid(rhs))
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@ -929,7 +944,7 @@ $EndFeature, "
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without modifying the original"]
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#[inline]
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pub const fn checked_rem(self, rhs: Self) -> Option<Self> {
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if rhs == 0 || (self == Self::MIN && rhs == -1) {
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if unlikely!(rhs == 0 || (self == Self::MIN && rhs == -1)) {
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None
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} else {
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// SAFETY: div by zero and by INT_MIN have been checked above
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@ -957,7 +972,7 @@ assert_eq!(", stringify!($SelfT), "::MIN.checked_rem_euclid(-1), None);
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without modifying the original"]
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#[inline]
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pub const fn checked_rem_euclid(self, rhs: Self) -> Option<Self> {
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if rhs == 0 || (self == Self::MIN && rhs == -1) {
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if unlikely!(rhs == 0 || (self == Self::MIN && rhs == -1)) {
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None
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} else {
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Some(self.rem_euclid(rhs))
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@ -983,7 +998,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_neg(self) -> Option<Self> {
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let (a, b) = self.overflowing_neg();
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -1007,7 +1022,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_shl(self, rhs: u32) -> Option<Self> {
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let (a, b) = self.overflowing_shl(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -1031,7 +1046,7 @@ $EndFeature, "
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#[inline]
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pub const fn checked_shr(self, rhs: u32) -> Option<Self> {
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let (a, b) = self.overflowing_shr(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -1738,7 +1753,7 @@ $EndFeature, "
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#[must_use = "this returns the result of the operation, \
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without modifying the original"]
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pub const fn overflowing_div(self, rhs: Self) -> (Self, bool) {
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if self == Self::MIN && rhs == -1 {
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if unlikely!(self == Self::MIN && rhs == -1) {
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(self, true)
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} else {
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(self / rhs, false)
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@ -1771,7 +1786,7 @@ assert_eq!(", stringify!($SelfT), "::MIN.overflowing_div_euclid(-1), (", stringi
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#[must_use = "this returns the result of the operation, \
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without modifying the original"]
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pub const fn overflowing_div_euclid(self, rhs: Self) -> (Self, bool) {
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if self == Self::MIN && rhs == -1 {
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if unlikely!(self == Self::MIN && rhs == -1) {
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(self, true)
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} else {
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(self.div_euclid(rhs), false)
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@ -1805,7 +1820,7 @@ $EndFeature, "
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#[must_use = "this returns the result of the operation, \
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without modifying the original"]
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pub const fn overflowing_rem(self, rhs: Self) -> (Self, bool) {
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if self == Self::MIN && rhs == -1 {
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if unlikely!(self == Self::MIN && rhs == -1) {
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(0, true)
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} else {
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(self % rhs, false)
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@ -1838,7 +1853,7 @@ assert_eq!(", stringify!($SelfT), "::MIN.overflowing_rem_euclid(-1), (0, true));
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without modifying the original"]
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#[inline]
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pub const fn overflowing_rem_euclid(self, rhs: Self) -> (Self, bool) {
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if self == Self::MIN && rhs == -1 {
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if unlikely!(self == Self::MIN && rhs == -1) {
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(0, true)
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} else {
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(self.rem_euclid(rhs), false)
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@ -1869,7 +1884,7 @@ assert_eq!(", stringify!($SelfT), "::MIN.overflowing_neg(), (", stringify!($Self
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#[allow(unused_attributes)]
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#[cfg_attr(bootstrap, allow_internal_unstable(const_if_match))]
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pub const fn overflowing_neg(self) -> (Self, bool) {
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if self == Self::MIN {
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if unlikely!(self == Self::MIN) {
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(Self::MIN, true)
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} else {
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(-self, false)
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@ -2981,7 +2996,7 @@ assert_eq!((", stringify!($SelfT), "::MAX - 2).checked_add(3), None);", $EndFeat
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#[inline]
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pub const fn checked_add(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_add(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -3021,7 +3036,7 @@ assert_eq!(0", stringify!($SelfT), ".checked_sub(1), None);", $EndFeature, "
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#[inline]
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pub const fn checked_sub(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_sub(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -3061,7 +3076,7 @@ assert_eq!(", stringify!($SelfT), "::MAX.checked_mul(2), None);", $EndFeature, "
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#[inline]
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pub const fn checked_mul(self, rhs: Self) -> Option<Self> {
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let (a, b) = self.overflowing_mul(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -3100,11 +3115,12 @@ assert_eq!(1", stringify!($SelfT), ".checked_div(0), None);", $EndFeature, "
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without modifying the original"]
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#[inline]
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pub const fn checked_div(self, rhs: Self) -> Option<Self> {
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match rhs {
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0 => None,
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if unlikely!(rhs == 0) {
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None
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} else {
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// SAFETY: div by zero has been checked above and unsigned types have no other
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// failure modes for division
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rhs => Some(unsafe { intrinsics::unchecked_div(self, rhs) }),
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Some(unsafe { intrinsics::unchecked_div(self, rhs) })
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}
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}
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}
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@ -3127,7 +3143,7 @@ assert_eq!(1", stringify!($SelfT), ".checked_div_euclid(0), None);
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without modifying the original"]
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#[inline]
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pub const fn checked_div_euclid(self, rhs: Self) -> Option<Self> {
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if rhs == 0 {
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if unlikely!(rhs == 0) {
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None
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} else {
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Some(self.div_euclid(rhs))
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@ -3154,7 +3170,7 @@ assert_eq!(5", stringify!($SelfT), ".checked_rem(0), None);", $EndFeature, "
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without modifying the original"]
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#[inline]
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pub const fn checked_rem(self, rhs: Self) -> Option<Self> {
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if rhs == 0 {
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if unlikely!(rhs == 0) {
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None
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} else {
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// SAFETY: div by zero has been checked above and unsigned types have no other
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@ -3182,7 +3198,7 @@ assert_eq!(5", stringify!($SelfT), ".checked_rem_euclid(0), None);
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without modifying the original"]
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#[inline]
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pub const fn checked_rem_euclid(self, rhs: Self) -> Option<Self> {
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if rhs == 0 {
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if unlikely!(rhs == 0) {
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None
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} else {
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Some(self.rem_euclid(rhs))
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@ -3209,7 +3225,7 @@ assert_eq!(1", stringify!($SelfT), ".checked_neg(), None);", $EndFeature, "
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#[inline]
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pub const fn checked_neg(self) -> Option<Self> {
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let (a, b) = self.overflowing_neg();
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -3232,7 +3248,7 @@ assert_eq!(0x10", stringify!($SelfT), ".checked_shl(129), None);", $EndFeature,
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#[inline]
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pub const fn checked_shl(self, rhs: u32) -> Option<Self> {
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let (a, b) = self.overflowing_shl(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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@ -3255,7 +3271,7 @@ assert_eq!(0x10", stringify!($SelfT), ".checked_shr(129), None);", $EndFeature,
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#[inline]
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pub const fn checked_shr(self, rhs: u32) -> Option<Self> {
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let (a, b) = self.overflowing_shr(rhs);
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if b {None} else {Some(a)}
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if unlikely!(b) {None} else {Some(a)}
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}
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}
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