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machine: avoid binary size regression after LLVM memory intrinsics #998

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Merged
merged 1 commit into from
Mar 27, 2020

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aykevl
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@aykevl aykevl commented Mar 27, 2020

Somehow moving to LLVM memory intrinsics for calls like memcpy made the
machine.sendUSBPacket get inlined. This is a problem because it is
called in many different functions and it is just big enough to cause a
significant file size increase.

Adding //go:noinline solves this problem and gets the examples/blinky1
program below the file size it was before this change (tested:
itsybitsy-m0, itsybitsy-m4, circuitplay-bluefruit).

This PR fixes the binary size regression seen in #995.

Somehow moving to LLVM memory intrinsics for calls like memcpy made the
machine.sendUSBPacket get inlined. This is a problem because it is
called in many different functions and it is just big enough to cause a
significant file size increase.

Adding //go:noinline solves this problem and gets the examples/blinky1
program below the file size it was before this change (tested:
itsybitsy-m0, itsybitsy-m4, circuitplay-bluefruit).
@deadprogram
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Thanks @aykevl now merging.

@deadprogram deadprogram merged commit c01f811 into dev Mar 27, 2020
@deadprogram deadprogram deleted the avoid-memcalls-regression branch March 27, 2020 20:01
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2 participants