user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[const-prop] Handle Rvalue::Len

Browse source
This commit is contained in:
Wesley Wiser 2019-05-20 05:46:33 -04:00
parent 1e50e01bb7
commit dee05ab2cc
2 changed files with 46 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

40
src/test/mir-opt/const_prop/slice_len.rs
View file

@ -1,22 +1,22 @@
fn test() -> &'static [u32] {
&[1, 2]
}
fn main() {
let x = test()[0];
(&[1u32, 2, 3] as &[u32])[1];
}
// END RUST SOURCE
// START rustc.main.ConstProp.before.mir
// bb1: {
// bb0: {
// ...
// _3 = const 0usize;
// _4 = Len((*_2));
// _5 = Lt(_3, _4);
// assert(move _5, "index out of bounds: the len is move _4 but the index is _3") -> bb2;
// _4 = &(promoted[0]: [u32; 3]);
// _3 = _4;
// _2 = move _3 as &[u32] (Pointer(Unsize));
// ...
// _6 = const 1usize;
// _7 = Len((*_2));
// _8 = Lt(_6, _7);
// assert(move _8, "index out of bounds: the len is move _7 but the index is _6") -> bb1;
// }
// bb2: {
// _1 = (*_2)[_3];
// bb1: {
// _1 = (*_2)[_6];
// ...
// return;
// }
@ -24,13 +24,17 @@ fn main() {
// START rustc.main.ConstProp.after.mir
// bb0: {
// ...
// _3 = const 0usize;
// _4 = Len((*_2));
// _5 = Lt(_3, _4);
// assert(move _5, "index out of bounds: the len is move _4 but the index is _3") -> bb2;
// _4 = const Scalar(AllocId(0).0x0) : &[u32; 3];
// _3 = const Scalar(AllocId(0).0x0) : &[u32; 3];
// _2 = move _3 as &[u32] (Pointer(Unsize));
// ...
// _6 = const 1usize;
// _7 = const 3usize;
// _8 = const true;
// assert(const true, "index out of bounds: the len is move _7 but the index is _6") -> bb1;
// }
// bb2: {
// _1 = (*_2)[_3];
// bb1: {
// _1 = (*_2)[_6];
// ...
// return;
// }