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Auto merge of #108872 - cjgillot:simp-const-prop, r=oli-obk
Strengthen state tracking in const-prop Some/many of the changes are replicated between both the const-prop lint and the const-prop optimization. Behaviour changes: - const-prop opt does not give a span to propagated values. This was useless as that span's primary purpose is to diagnose evaluation failure in codegen. - we remove the `OnlyPropagateInto` mode. It was only used for function arguments, which are better modeled by a write before entry. - the tracking of assignments and discriminants make clearer that we do nothing in `NoPropagation` mode or on indirect places.
This commit is contained in:
commit
e07c6b4899
5 changed files with 24 additions and 21 deletions
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@ -31,9 +31,7 @@ impl core::ops::Mul<i32> for Vec1 {
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#[allow(clippy::no_effect)]
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#[warn(clippy::erasing_op)]
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fn main() {
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let x: u8 = 0;
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fn test(x: u8) {
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x * 0;
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0 & x;
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0 / x;
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@ -41,3 +39,7 @@ fn main() {
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0 * Vec1 { x: 5 };
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Vec1 { x: 5 } * 0;
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}
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fn main() {
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test(0)
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}
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@ -1,5 +1,5 @@
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error: this operation will always return zero. This is likely not the intended outcome
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--> $DIR/erasing_op.rs:37:5
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--> $DIR/erasing_op.rs:35:5
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LL | x * 0;
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| ^^^^^
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@ -7,25 +7,25 @@ LL | x * 0;
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= note: `-D clippy::erasing-op` implied by `-D warnings`
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error: this operation will always return zero. This is likely not the intended outcome
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--> $DIR/erasing_op.rs:38:5
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--> $DIR/erasing_op.rs:36:5
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LL | 0 & x;
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| ^^^^^
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error: this operation will always return zero. This is likely not the intended outcome
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--> $DIR/erasing_op.rs:39:5
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--> $DIR/erasing_op.rs:37:5
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LL | 0 / x;
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| ^^^^^
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error: this operation will always return zero. This is likely not the intended outcome
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--> $DIR/erasing_op.rs:41:5
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--> $DIR/erasing_op.rs:39:5
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LL | 0 * Vec1 { x: 5 };
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| ^^^^^^^^^^^^^^^^^
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error: this operation will always return zero. This is likely not the intended outcome
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--> $DIR/erasing_op.rs:42:5
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--> $DIR/erasing_op.rs:40:5
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LL | Vec1 { x: 5 } * 0;
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| ^^^^^^^^^^^^^^^^^
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@ -4,7 +4,7 @@
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#[rustfmt::skip]
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fn main() {
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let mut i = 1i32;
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let mut var1 = 0i32;
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let mut var1 = 13i32;
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let mut var2 = -1i32;
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1 + i;
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i * 2;
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@ -1,9 +1,6 @@
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#![warn(clippy::overflow_check_conditional)]
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fn main() {
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let a: u32 = 1;
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let b: u32 = 2;
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let c: u32 = 3;
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fn test(a: u32, b: u32, c: u32) {
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if a + b < a {}
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if a > a + b {}
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if a + b < b {}
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@ -23,3 +20,7 @@ fn main() {
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if i > i + j {}
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if i - j < i {}
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}
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fn main() {
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test(1, 2, 3)
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}
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@ -1,5 +1,5 @@
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error: you are trying to use classic C overflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:7:8
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--> $DIR/overflow_check_conditional.rs:4:8
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LL | if a + b < a {}
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| ^^^^^^^^^
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@ -7,43 +7,43 @@ LL | if a + b < a {}
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= note: `-D clippy::overflow-check-conditional` implied by `-D warnings`
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error: you are trying to use classic C overflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:8:8
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--> $DIR/overflow_check_conditional.rs:5:8
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LL | if a > a + b {}
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| ^^^^^^^^^
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error: you are trying to use classic C overflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:9:8
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--> $DIR/overflow_check_conditional.rs:6:8
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LL | if a + b < b {}
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| ^^^^^^^^^
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error: you are trying to use classic C overflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:10:8
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--> $DIR/overflow_check_conditional.rs:7:8
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LL | if b > a + b {}
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| ^^^^^^^^^
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error: you are trying to use classic C underflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:11:8
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--> $DIR/overflow_check_conditional.rs:8:8
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LL | if a - b > b {}
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| ^^^^^^^^^
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error: you are trying to use classic C underflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:12:8
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--> $DIR/overflow_check_conditional.rs:9:8
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LL | if b < a - b {}
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| ^^^^^^^^^
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error: you are trying to use classic C underflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:13:8
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--> $DIR/overflow_check_conditional.rs:10:8
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LL | if a - b > a {}
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| ^^^^^^^^^
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error: you are trying to use classic C underflow conditions that will fail in Rust
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--> $DIR/overflow_check_conditional.rs:14:8
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--> $DIR/overflow_check_conditional.rs:11:8
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LL | if a < a - b {}
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| ^^^^^^^^^
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