[mono][perf] iOS disk size regression on 12 Apr 2023

[kotlarmilos]

Description

Disk size (SOD) regressions detected in HelloiOS app.

Details - Mono AOT LLVM Release

Date	Diff	Change	Size increase (bytes)	Size increase (%)
12 Apr 2022	e7ed417...7526a4c	#84289	590688	2.11

Configuration

OS: iPhone 12 Mini
Architecture: arm64
.NET version: 8.0.100-preview.3.23178.7

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Issue Details

---

Description

Disk size (SOD) regressions detected in HelloiOS app.

Details - Mono AOT LLVM Release

Date	Diff	Size increase (bytes)	Size increase (%)
12 Apr 2022	e7ed417...7526a4c	#84289	590688

Configuration

OS: iPhone 12 Mini
Architecture: arm64
.NET version: 8.0.100-preview.3.23178.7

Author:	kotlarmilos
Assignees:	-
Labels:	tenet-performance, area-Codegen-AOT-mono, os-ios, size-reduction
Milestone:	-

[kotlarmilos]

@fanyang-mono Could the regression be caused by the addition of intrinsified methods? We can list binary symbols before and after the change.

[fanyang-mono]

I can't think of how emitting intrinsics would make the generated code bigger, on the contrary, I would expect it to be smaller. Please list the symbols before and after the change of the chart, and we could take it from there.

[kotlarmilos]

I assumed that intrinsified methods had been added, but the symbol count remained almost unchanged. However, the bundle size has increased by 36kb. Furthermore, after commit 279c65a, the bundle size has increased by an additional 31kb.

However, none of these changes reflect the increase of 500kb, so further investigation is needed. Symbols before and after the change are at helloios-app-bundles.zip.