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Rollup merge of #91162 - RalfJung:miri-shift-truncation, r=oli-obk

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explain why CTFE/Miri perform truncation on shift offset

Closes https://github.com/rust-lang/miri/issues/1920
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Matthias Krüger 2021-11-25 15:05:39 +01:00 • committed by GitHub
commit 5fff1d77e7
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2 changed files with 14 additions and 1 deletions
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8
compiler/rustc_middle/src/mir/mod.rs
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@ -2246,8 +2246,12 @@ pub enum BinOp {
/// The `*` operator (multiplication)
Mul,
/// The `/` operator (division)
///
/// Division by zero is UB.
Div,
/// The `%` operator (modulus)
///
/// Using zero as the modulus (second operand) is UB.
Rem,
/// The `^` operator (bitwise xor)
BitXor,
@ -2256,8 +2260,12 @@ pub enum BinOp {
/// The `|` operator (bitwise or)
BitOr,
/// The `<<` operator (shift left)
///
/// The offset is truncated to the size of the first operand before shifting.
Shl,
/// The `>>` operator (shift right)
///
/// The offset is truncated to the size of the first operand before shifting.
Shr,
/// The `==` operator (equality)
Eq,