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[DebugInfo] Re-apply two patches to MachineSink

Authored by jmorse on Dec 5 2019, 6:46 AM.

Description

[DebugInfo] Re-apply two patches to MachineSink

These were:

Of which the latter has a performance regression tracked in PR43855,
fixed by D70672 / D70676, which will be committed atomically with this
reapplication.

Contains a minor difference to account for a change in the IsCopyInstr
signature.

Details

Committed
jmorseDec 5 2019, 7:52 AM
Parents
rG403bb33a2e6a: [InstCombine] add tests for fpext+select+fptrunc; NFC
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