From c4717cc9d15d30e08f03f51845c950175979bcc4 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 8 Aug 2024 17:18:20 +1000
Subject: Shrink `TyKind::FnPtr`.

By splitting the `FnSig` within `TyKind::FnPtr` into `FnSigTys` and
`FnHeader`, which can be packed more efficiently. This reduces the size
of the hot `TyKind` type from 32 bytes to 24 bytes on 64-bit platforms.
This reduces peak memory usage by a few percent on some benchmarks. It
also reduces cache misses and page faults similarly, though this doesn't
translate to clear cycles or wall-time improvements on CI.
---
 compiler/rustc_pattern_analysis/src/rustc.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'compiler/rustc_pattern_analysis/src')

diff --git a/compiler/rustc_pattern_analysis/src/rustc.rs b/compiler/rustc_pattern_analysis/src/rustc.rs
index 6290aeb2523..cc978b12083 100644
--- a/compiler/rustc_pattern_analysis/src/rustc.rs
+++ b/compiler/rustc_pattern_analysis/src/rustc.rs
@@ -414,7 +414,7 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
             | ty::Foreign(_)
             | ty::RawPtr(_, _)
             | ty::FnDef(_, _)
-            | ty::FnPtr(_)
+            | ty::FnPtr(..)
             | ty::Pat(_, _)
             | ty::Dynamic(_, _, _)
             | ty::Closure(..)
-- 
cgit 1.4.1-3-g733a5