bjoernager/rust
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More GVN for PtrMetadata

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`PtrMetadata` doesn't care about `*const`/`*mut`/`&`/`&mut`, so GVN away those casts in its argument.

This includes updating MIR to allow calling PtrMetadata on references too, not just raw pointers.  That means that `[T]::len` can be just `_0 = PtrMetadata(_1)`, for example.

# Conflicts:
#	tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir
#	tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir
This commit is contained in:
Scott McMurray 2024-06-19 22:14:31 -07:00
parent 31d8696ac9
commit 4a7b6c0e6c
14 changed files with 319 additions and 78 deletions
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2
compiler/rustc_const_eval/src/interpret/operator.rs
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@ -460,7 +460,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
let res = ScalarInt::truncate_from_uint(res, layout.size).0;
Ok(ImmTy::from_scalar(res.into(), layout))
}
ty::RawPtr(..) => {
ty::RawPtr(..) | ty::Ref(..) => {
assert_eq!(un_op, PtrMetadata);
let (_, meta) = val.to_scalar_and_meta();
Ok(match meta {