Teresa Johnson 1761e2c1a9 [ThinLTO] Record whether call edges come from indirect calls in the summary (#233924) ...

Add a `HasIndirectCall` flag to the summary call edge (`CalleeInfo`),
set by the summary analysis when recording indirect call edges (from
indirect call value profile targets, or from `!callees` metadata on
indirect calls that could not be promoted/devirtualized to direct
calls). If a function calls the same callee both directly and
indirectly, the merged edge is marked indirect.

This will be used by a follow-up MemProf ThinLTO change to distinguish
indirect call edges (which require importing the target at least as a
declaration for indirect call promotion in the backend when assigned to
a cloned cross-module callee) from direct call edges (where the backend
already has or can directly update the declaration).

The flag uses a previously unused bit of the existing `CalleeInfo`
bitfield (no in-memory size change), and is encoded as bit 4 of the
existing per-call-edge hotness/tail call flags operand in the per-module
and combined summaries. The encoded flags value is at most 31, which
still fits in a single chunk of both the VBR8 abbreviation array element
and the VBR6 unabbreviated encoding, so the bitcode size is unchanged.
Older readers ignore the bit, and older bitcode is read as not indirect,
so no summary version bump is needed. The flag is printed and parsed as
`indirect: 1` in the textual summary (only emitted when set, like
`tail: 1`).

Assisted-by: Gemini

2026-10-21 12:05:32 -07:00

..

BitcodeAnalyzer.cpp

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BitcodeReader.cpp

[ThinLTO] Record whether call edges come from indirect calls in the summary (#233924)

2026-10-21 12:05:32 -07:00

BitReader.cpp

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CMakeLists.txt

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MetadataLoader.cpp

[DebugInfo] Add DILayerLoc/DILayerLocList and DILocation irlayers operand (#215666)

2026-10-06 11:22:05 -07:00

MetadataLoader.h

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ValueList.cpp

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ValueList.h

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