Subzero Compilation Failure

[dtip...@pdftron.com]

First of all thank you for adding the subzero compilation option. I am really impressed by how quickly the .pexe files can now be loaded. :)

I encountered the following error with subzero (using optlevel:0) when loading the .pexe zipped athttp://pdftron.s3.amazonaws.com/custom/ID-zJWLuhTffd3c/google/PDFWorkerFull.zip. Perhaps this has something to do with the size or complexity of the .pexe file? The error given is the following:

NativeClient: PnaclCoordinator: Compile stream end failed: reply not received from PNaCl translator (it probably crashed)

Other details:

1. Platform: Windows 10 64-bit

2. This file compiles perfectly fine with optlevel: 2.

3. My chrome version is 55.0.2883.87.

Is there a recommended place to file an official bug report or is this sufficient?

Thanks,

David

[Jim Stichnoth]

Thanks!  It would be great if you could file a new bug report:

https://bugs.chromium.org/p/nativeclient/issues/entry

(If that doesn't work for you, I can do it.)

In any case, I found and fixed the bug that caused this crash.  There is an unusual-looking bitcode instruction, "mul i32 undef, 4", and during a multiply-by-power-of-two optimization, Subzero creates a movzx instruction with an immediate 0 as its operand, which is not an encodable addressing mode for movzx.  See https://codereview.chromium.org/2598153002/ .

It will take several days to push the fix, especially given the holidays.

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[dtip...@pdftron.com]

Thanks for looking into this! I posted a bug (hopefully what you were looking for) at https://bugs.chromium.org/p/nativeclient/issues/detail?id=4384.

> It will take several days to push the fix, especially given the holidays.

Sounds good to me. I am just happy that a fix is going to make its way into the pipeline.

Thanks again,

David

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[Jim Stichnoth]

OK, I have pushed a fix to "QA".  Would you mind testing your app before I push it live?

1. Make sure chrome is completely exited.

2. Restart chrome with an extra flag:

  chrome --component-updater=test-request

3. Visit chrome://components .  The pnacl version should be 0.57.44.2492 - if not, click the "Check for update" button to download immediately.

4. Test your PNaCl-enabled web site.

Thanks!

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