Bisection points to this one:

Author: evandro
Date: Mon Feb 12 08:41:41 2018
New Revision: 324903

URL: http://llvm.org/viewvc/llvm-project?rev=324903&view=rev
Log:
[AArch64] Refactor identification of SIMD immediates

Get rid of icky goto loops and make the code easier to maintain (NFC).

Differential revision: https://reviews.llvm.org/D42723

Modified:
llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp

Reverted in r325034 in the meantime

Would it be possible to attach a preprocessed version of the offending code, please?

Would it be possible to attach a preprocessed version of the offending code,
please?

It was too large to attach here directly, so I added it to
https://bugs.chromium.org/p/chromium/issues/detail?id=811767#c1 which I linked to above.

That file doesn't seem to be the preprocessed output that results when the -E option is specified. I'm still getting too many compilation errors and cannot confirm the fix for it. Please, attach the .i file to the Chromium bug as well.

Posted fix for review at https://reviews.llvm.org/D42133

preprocessed repro

That file doesn't seem to be the preprocessed output that results when the
-E option is specified. I'm still getting too many compilation errors and
cannot confirm the fix for it. Please, attach the .i file to the Chromium
bug as well.

It's the reproducer created by clang when it crashed. I think that means it's got all the #include files pulled in, but it still has other preprocessor directives.

Attaching a preprocessed version which shows the error when invoked as:

$ clang -cc1 -triple aarch64--linux-android -emit-obj -target-cpu generic -target-feature +neon -target-abi aapcs -Oz -std=gnu++14 -vectorize-slp -x c++ /tmp/a.ii

Posted fix for review at https://reviews.llvm.org/D42133

I applied this on top of r324903 but still get the same error using the repro in #c7.

Posted fix for review at https://reviews.llvm.org/D42133

I applied this on top of r324903 but still get the same error using the
repro in #c7.

Oh, or did you mean https://reviews.llvm.org/D43364 ?

I applied this too, but still get the same failure.

Got it narrowed down to:

define void @​v2i32st(<2 x i32>* %p) nounwind {
store <2 x i32> <i32 0, i32 1073741824>, <2 x i32>* %p, align 8
ret void
}

Thank you!

Please, confirm solution in https://reviews.llvm.org/D43364.

Thank you.

Please, confirm solution in https://reviews.llvm.org/D43364.

Yes, that seems to work.

I'd appreciate if you could review the patch too. Thanks for confirming this bug fixed.

I'd appreciate if you could review the patch too. Thanks for confirming
this bug fixed.

Sorry, I don't know anything about aarch64 isel, so I'm not a good reviewer for this.