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Fix bug in OverflowOps
impl for unsigned integers.
Namely, the special case treatment for `div`/`rem` is only applicable to signed integer values. Clearly RFC 1027 would have saved us here! ;)
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@ -30,7 +30,7 @@
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use intrinsics::{i32_mul_with_overflow, u32_mul_with_overflow};
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use intrinsics::{i64_mul_with_overflow, u64_mul_with_overflow};
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use ::{i8,i16,i32,i64,u8,u16,u32,u64};
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use ::{i8,i16,i32,i64};
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#[unstable(feature = "core", reason = "may be removed, renamed, or relocated")]
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#[deprecated(since = "1.0.0", reason = "moved to inherent methods")]
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@ -206,7 +206,7 @@ mod shift_max {
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pub const u64: u32 = i64;
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}
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macro_rules! overflowing_impl {
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macro_rules! signed_overflowing_impl {
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($($t:ident)*) => ($(
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impl OverflowingOps for $t {
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#[inline(always)]
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@ -259,7 +259,53 @@ fn overflowing_shr(self, rhs: u32) -> ($t, bool) {
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)*)
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}
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overflowing_impl! { u8 u16 u32 u64 i8 i16 i32 i64 }
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macro_rules! unsigned_overflowing_impl {
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($($t:ident)*) => ($(
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impl OverflowingOps for $t {
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#[inline(always)]
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fn overflowing_add(self, rhs: $t) -> ($t, bool) {
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unsafe {
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concat_idents!($t, _add_with_overflow)(self, rhs)
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}
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}
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#[inline(always)]
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fn overflowing_sub(self, rhs: $t) -> ($t, bool) {
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unsafe {
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concat_idents!($t, _sub_with_overflow)(self, rhs)
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}
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}
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#[inline(always)]
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fn overflowing_mul(self, rhs: $t) -> ($t, bool) {
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unsafe {
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concat_idents!($t, _mul_with_overflow)(self, rhs)
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}
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}
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#[inline(always)]
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fn overflowing_div(self, rhs: $t) -> ($t, bool) {
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(self/rhs, false)
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}
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#[inline(always)]
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fn overflowing_rem(self, rhs: $t) -> ($t, bool) {
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(self % rhs, false)
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}
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#[inline(always)]
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fn overflowing_shl(self, rhs: u32) -> ($t, bool) {
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(self << (rhs & self::shift_max::$t),
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(rhs > self::shift_max::$t))
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}
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#[inline(always)]
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fn overflowing_shr(self, rhs: u32) -> ($t, bool) {
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(self >> (rhs & self::shift_max::$t),
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(rhs > self::shift_max::$t))
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}
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}
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)*)
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}
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signed_overflowing_impl! { i8 i16 i32 i64 }
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unsigned_overflowing_impl! { u8 u16 u32 u64 }
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#[cfg(target_pointer_width = "64")]
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impl OverflowingOps for usize {
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