rentzsch
Landon Fuller
@rentzsch Bitcode: non-reproducible Apple-internal toolchain bugs, emergent bugs from undefined behavior that previously worked, etc ...
surprised most dev gripes about bitcode is unpredictable optimization effects. Folks, we’ve been living in emulated ISAs since the 90s
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@landonfuller Sure, I share lots of your pessimism. Then again, Apple has executed processor shenanigans very well in the past.
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@rentzsch It’s always interesting to be reminded that there are also “air tight” abstractions. -
@kastiglione interesting take! -
@rentzsch Not the degree of your example, but I’ve noticed when people’s concerns fail to consider compiler implementation details.
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@rentzsch otoh people have gotten bit by this already on the Nexus 9's wacky CPU (http://www.anandtech.com/show/8701/the-google-nexus-9-review/4 …) - Show more
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@rentzsch I'm a lot less worried about emulated ISAs given that the chances I have to debug one are pretty much nil. -
@landonfuller@rentzsch The idea of not running the same code everywhere is troubling. (Yes I realize that’s already not always happening.) - View other replies
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@ameaijou@landonfuller@rentzsch often .NET apps are compiled to native on install, targeting the machine architecture -
@stuartcarnie@ameaijou@rentzsch The big difference is that CLR defines a high-level virtual machine, LLVM bitcode doesn't. -
@stuartcarnie@ameaijou@rentzsch Only time I've had to debug JVM's JIT was when working on HotSpot; same isn't true for unsafe languages. -
@landonfuller were you doing that because you were specifically working on the hotspot compiler? -
@stuartcarnie Yeah; mostly codegen fixes for the Mac OS X port. -
@landonfuller nice. Always been intrigued by runtime code-gen. LuaJIT is my current interest - what an impressive piece of work
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@rentzsch Griping as a marker of expertise.
Jeffrey Bergier
Dave Lee
Daniel Jalkut
Brian Mastenbrook
Gwynne Raskind
Stuart Carnie
Drew Breunig
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