Chirag Ramani 5179bc9609 Add IRPGO and CSIRPGO options to Swift (#84335) ...

This PR introduces three new instrumentation flags and plumbs them
through to IRGen:

1. `-ir-profile-generate` - enable IR-level instrumentation.
2. `-cs-profile-generate` - enable context-sensitive IR-level
instrumentation.
3. `-ir-profile-use` - IR-level PGO input profdata file to enable
profile-guided optimization (both IRPGO and CSIRPGO)

**Context:**
https://forums.swift.org/t/ir-level-pgo-instrumentation-in-swift/82123

**Swift-driver PR:** https://github.com/swiftlang/swift-driver/pull/1992

**Tests and validation:**
This PR includes ir level verification tests, also checks few edge-cases
when `-ir-profile-use` supplied profile is either missing or is an
invalid IR profile.

However, for argument validation, linking, and generating IR profiles
that can later be consumed by -cs-profile-generate, I’ll need
corresponding swift-driver changes. Those changes are being tracked in
https://github.com/swiftlang/swift-driver/pull/1992

2025-10-09 17:41:47 -07:00

9.4 KiB

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