tree f5c49f2e831950beecf5cbab6cee96247979b8d5
parent 8ecec455183fd42fc191089d061f80bdf7b158fc
author Cullen Rhodes <cullen.rhodes@arm.com> 1778565753 +0100
committer GitHub <noreply@github.com> 1778565753 +0100
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[GlobalISel] Defer RegBankSelect operand mapper creation (#196985)

RegBankSelect::applyMapping constructs an OperandsMapper before applying
repairs. Default mappings that only need Reassign repairs only update
the register bank and do not create replacement operands, so the generic
applyDefaultMapping path has no rewriting work to do in that case.

Defer OperandsMapper creation until an Insert repair actually needs new
virtual registers. If no mapper was needed for a default mapping, return
after applying the repairs.

CTMark geomean -0.23% improvement on aarch64-O0-g.

https://llvm-compile-time-tracker.com/compare.php?from=ed50ea52004259af958bb3e5636268342c49ee62&to=1a4730426e14969626cad43c6b06e93bde707bd1&stat=instructions%3Au

Assisted-by: Codex