[gcc/devel/rust/master] Merge #1459
Thomas Schwinge
tschwinge@gcc.gnu.org
Tue Aug 16 19:04:53 GMT 2022
https://gcc.gnu.org/g:4665766d3cc9854d1609b71f673e96e0a340805c
commit 4665766d3cc9854d1609b71f673e96e0a340805c
Merge: 021e4953390 f68ecc7e591
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date: Tue Aug 16 10:39:44 2022 +0000
Merge #1459
1459: intrinsics: Add copy_nonoverlapping<T> r=CohenArthur a=CohenArthur
intrinsics: Add copy_nonoverlapping<T>
This intrinsic is similar to C's memcpy (or in our case, GCC's
__builtin_memcpy) with the order of arguments swapped and knowledge
about the type of the operands. So we can desugar the following calls:
`copy_nonoverlapping::<T>(src, dst, count)`
can be converted to
`__builtin_memcpy(dst, src, count * size_of::<T>())`
~~Sadly, calling this intrinsic results in calls being optimized out for some reason. I'll open a separate issue to deal with that as I don't have the skills to resolve it.~~ fixed by not marking the function's declaration as `TREE_READONLY`
Fixes #1450
Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>
Diff:
gcc/rust/backend/rust-builtins.h | 8 +++
gcc/rust/backend/rust-compile-intrinsic.cc | 73 +++++++++++++++++++++-
.../rust/execute/torture/copy_nonoverlapping1.rs | 17 +++++
3 files changed, 97 insertions(+), 1 deletion(-)
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