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2015 Oct 20
2
Question about METADATA_BLOCKs in bitcode
I have a question about module-level METADATA_BLOCKs in the bitcode. There are currently two blocks with the METADATA_BLOCK id at module scope. The first has the module-level metadata values (consisting of some combination of METADATA_* record codes except for METADATA_KIND). The second consists only of METADATA_KIND records. The latter is used only in the METADATA_ATTACHMENT block within function blocks (for metadata attached to instructions). For ThinLTO we want to delay the parsing of module level metadata until all functions have been imported from that module (t...