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rust / rust-lang / rust / a09fbe2c8372643a27a8082236120f95ed4e6bba
commita09fbe2c8372643a27a8082236120f95ed4e6bba[log] [tgz]
authorbors <bors@rust-lang.org>Mon Sep 08 03:03:21 2025 +0000
committerbors <bors@rust-lang.org>Mon Sep 08 03:03:21 2025 +0000
tree445d5655053f44f4b5488ce08b1640da71dcf8de
parent2f3f27bf79ec147fec9d2e7980605307a74067f4 [diff]
parentab91a63d403b0105cacd72809cd292a72984ed99 [diff]
Auto merge of #145910 - saethlin:ignore-intrinsic-calls, r=cjgillot

Ignore intrinsic calls in cross-crate-inlining cost model

I noticed in a side project that a function which just compares to `[u64; 2]` for equality is not cross-crate-inlinable. That was surprising to me because I didn't think that code contained a function call, but of course our array comparisons are lowered to an intrinsic. Intrinsic calls don't make a function no longer a leaf, so it makes sense to add this as an exception to the "only leaves" cross-crate-inline heuristic.

This is the useful compare link: https://perf.rust-lang.org/compare.html?start=7cb1a81145a739c4fd858abe3c624ce8e6e5f9cd&end=c3f0a64dbf9fba4722dacf8e39d2fe00069c995e&stat=instructions%3Au because it disables CGU merging in both commits, so effects that cause changes in the sysroot to perturb partitioning downstream are excluded. Perturbations to what is and isn't cross-crate-inlinable in the sysroot has chaotic effects on what items are in which CGUs after merging. It looks like before this PR by sheer luck some of the CGUs dirtied by the patch in eza incr-unchanged happened to be merged together, and with this PR they are not.

The perf runs on this PR point to a nice runtime performance improvement.
tree: 445d5655053f44f4b5488ce08b1640da71dcf8de
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