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# 0290a77a 25-May-2019 David Bolvansky <[email protected]>

[SimplifyCFG] Added condition assumption for unreachable blocks

Summary: PR41688

Reviewers: spatel, efriedma, craig.topper, hfinkel, reames

Reviewed By: hfinkel

Subscribers: javed.absar, dmgreen,

[SimplifyCFG] Added condition assumption for unreachable blocks

Summary: PR41688

Reviewers: spatel, efriedma, craig.topper, hfinkel, reames

Reviewed By: hfinkel

Subscribers: javed.absar, dmgreen, fhahn, hfinkel, reames, nikic, lebedev.ri, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61409

llvm-svn: 361707

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# bb76cf0f 25-May-2019 David Bolvansky <[email protected]>

[NFC] Update test checks

llvm-svn: 361695


Revision tags: llvmorg-8.0.1-rc1, llvmorg-8.0.0, llvmorg-8.0.0-rc5, llvmorg-8.0.0-rc4, llvmorg-8.0.0-rc3, llvmorg-7.1.0, llvmorg-7.1.0-rc1, llvmorg-8.0.0-rc2, llvmorg-8.0.0-rc1, llvmorg-7.0.1, llvmorg-7.0.1-rc3, llvmorg-7.0.1-rc2, llvmorg-7.0.1-rc1, llvmorg-7.0.0, llvmorg-7.0.0-rc3, llvmorg-7.0.0-rc2, llvmorg-7.0.0-rc1, llvmorg-6.0.1, llvmorg-6.0.1-rc3, llvmorg-6.0.1-rc2, llvmorg-6.0.1-rc1, llvmorg-5.0.2, llvmorg-5.0.2-rc2, llvmorg-5.0.2-rc1, llvmorg-6.0.0, llvmorg-6.0.0-rc3, llvmorg-6.0.0-rc2
# 1d91ec34 24-Jan-2018 Sanjay Patel <[email protected]>

[ValueTracking] add recursion depth param to matchSelectPattern

We're getting bug reports:
https://bugs.llvm.org/show_bug.cgi?id=35807
https://bugs.llvm.org/show_bug.cgi?id=35840
https://bugs.llvm.

[ValueTracking] add recursion depth param to matchSelectPattern

We're getting bug reports:
https://bugs.llvm.org/show_bug.cgi?id=35807
https://bugs.llvm.org/show_bug.cgi?id=35840
https://bugs.llvm.org/show_bug.cgi?id=36045
...where we blow up the stack in value tracking because other passes are sending
in selects that have an operand that is itself the select.

We don't currently have a reliable way to avoid analyzing dead code that may take
non-standard forms, so bail out when things go too far.

This mimics the recursion depth limitations in other parts of value tracking.

Unfortunately, this pushes the underlying problems for other passes (jump-threading,
simplifycfg, correlated-propagation) into hiding. If someone wants to uncover those
again, the first draft of this patch on Phab would do that (it would assert rather
than bail out).

Differential Revision: https://reviews.llvm.org/D42442

llvm-svn: 323331

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