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Large structures expose GCC/clang compile time bug #1248

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veripoolbot opened this issue Dec 7, 2017 · 3 comments
Closed

Large structures expose GCC/clang compile time bug #1248

veripoolbot opened this issue Dec 7, 2017 · 3 comments

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@veripoolbot
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@veripoolbot veripoolbot commented Dec 7, 2017


Author Name: Wilson Snyder (@wsnyder)
Original Redmine Issue: 1248 from https://www.veripool.org

Original Assignee: Wilson Snyder (@wsnyder)


Very large models cause Verilator to generate classes with a large number of member variables. When these are compiled with GCC or clang (LLVM), these appear to expose a O(n^2) slowdown.

I have filed a GCC bug related to this:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83309

This appears to apply to all current versions of GCC and clang.

As it will be a long time before this is resolved a Verilator workaround is desired.

@veripoolbot
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@veripoolbot veripoolbot commented Dec 9, 2017


Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-12-09T17:03:14Z


Matching problem in clang/LLVM:

https://bugs.llvm.org/show_bug.cgi?id=35585

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@veripoolbot veripoolbot commented Dec 9, 2017


Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-12-09T17:03:48Z


Workaround added to Verilator in git towards 3.917.

@veripoolbot
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@veripoolbot veripoolbot commented Jan 2, 2018


Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2018-01-02T23:14:46Z


In 3.918.

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