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b2c717fa33
I was looking into `array::IntoIter` optimization, and noticed that it wasn't annotating the loads with `noundef` for simple things like `array::IntoIter<i32, N>`. Turned out to be a more general problem as `MaybeUninit::assume_init_read` isn't marking the load as initialized (<https://rust.godbolt.org/z/Mxd8TPTnv>), which is unfortunate since that's basically its reason to exist. This PR lowers `ptr::read(p)` to `copy *p` in MIR, which fortuitiously also improves the IR we give to LLVM for things like `mem::replace`. |
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assembly | ||
auxiliary | ||
codegen | ||
codegen-units | ||
debuginfo | ||
incremental | ||
mir-opt | ||
pretty | ||
run-make | ||
run-make-fulldeps | ||
run-pass-valgrind | ||
rustdoc | ||
rustdoc-gui | ||
rustdoc-js | ||
rustdoc-js-std | ||
rustdoc-json | ||
rustdoc-ui | ||
ui | ||
ui-fulldeps | ||
COMPILER_TESTS.md |