https://llvm.org/bugs/show_bug.cgi?id=28832
Bug ID: 28832
Summary: LICM takes forever (100+ seconds) on a small testcase
with large number of loads/stores per block
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: dber...@dberlin.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16871
--> https://llvm.org/bugs/attachment.cgi?id=16871&action=edit
Small version of testcase
This is the same testcase as PR28670.
I've attached the small version.
On my mac, LICM takes >100 seconds, all of it being spent in the
aliassettracker, doing merges and alias calls:
52.1751 ( 48.2%) 0.5258 ( 47.6%) 52.7009 ( 48.2%) 53.0047 ( 48.2%) Loop
Invariant Code Motion
20.9636 ( 19.4%) 0.2059 ( 18.6%) 21.1694 ( 19.4%) 21.2563 ( 19.3%) Loop
Invariant Code Motion
17.6664 ( 16.3%) 0.1026 ( 9.3%) 17.7690 ( 16.2%) 17.8337 ( 16.2%) Loop
Invariant Code Motion
On the larger version of this testcase, it's even worse.
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