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CodeGen/Generic/2003-05-28-ManyArgs.ll hits exponential behavior on PPC #1219

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isanbard opened this issue Jul 26, 2006 · 8 comments
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CodeGen/Generic/2003-05-28-ManyArgs.ll hits exponential behavior on PPC #1219

isanbard opened this issue Jul 26, 2006 · 8 comments
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@lattner
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bugzilla Issues migrated from bugzilla llvm:codegen quality-of-implementation

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@isanbard
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Bugzilla Link 847
Resolution FIXED
Resolved on Feb 22, 2010 12:47
Version 1.6
OS MacOS X

Extended Description

The test/Regression/CodeGen/Generic/2003-05-28-ManyArgs.ll test-point was running for several
minutes on my machine before I killed it. I looked at it in the debugger and it seems to be doing the
legalizing of the selection DAG forever.

-bw
@isanbard
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assigned to @lattner

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lattner commented Jul 27, 2006

Verified, do you want me to take it?

@isanbard
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I'd like to give it a shot. I'll look at it tonight.

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lattner commented Jul 27, 2006

This looks like exponential behavior in LegalizeAllNodesNotLeadingTo, not an infinite loop. I'll see if it's
easy, if so I'd like to get it in before 1.8, so I'll fix it right away.

-Chris

@isanbard
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Okay. I'll also look at it unless you close the bug. Yeah, it would be weird if it hung on one thing and not
everything.

@lattner
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lattner commented Jul 27, 2006

Have a fix. Sorry to steal this from you. :(

@isanbard
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No biggie. :)

@lattner
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lattner commented Jul 27, 2006

Patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20060724/036214.html

With this fix, CodeGen/Generic/2003-05-28-ManyArgs.ll compiles nearly instantly.

-Chris

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
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bugzilla Issues migrated from bugzilla llvm:codegen quality-of-implementation
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