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d754696bcb
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Dimitry Andric d754696bcb For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov): 
[SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

This commit is the cause of excessive compile times on skein_block.c
(and possibly other files) during kernel builds on amd64.

We never saw the problematic behavior described in this upstream commit,
so for now it is better to revert it.  An upstream bug has been filed
here: https://bugs.llvm.org/show_bug.cgi?id=32142

Reported by:	mjg
2017-03-05 19:56:20 +00:00
..
Analysis For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov): 2017-03-05 19:56:20 +00:00
AsmParser Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
Bitcode Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-11 13:58:05 +00:00
CodeGen Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-28 21:18:23 +00:00
DebugInfo Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
Demangle Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
ExecutionEngine Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
IR Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
IRReader Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
LibDriver Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
LineEditor Update llvm to release_39 branch r276489, and resolve conflicts. 2016-08-16 21:02:59 +00:00
Linker Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
LTO Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-17 20:07:35 +00:00
MC Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-11 13:58:05 +00:00
Object Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
ObjectYAML Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
Option Update llvm to trunk r290819 and resolve conflicts. 2017-01-02 21:25:48 +00:00
Passes Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
ProfileData Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
Support Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00
TableGen Merge llvm, clang, lld and lldb trunk r291012, and resolve conflicts. 2017-01-04 22:19:42 +00:00
Target Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-25 15:00:57 +00:00
Transforms Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branch 2017-02-25 15:00:57 +00:00
XRay Merge llvm, clang, lld and lldb release_40 branch r292009. Also update 2017-01-14 22:12:13 +00:00