https://llvm.org/bugs/show_bug.cgi?id=24171
Bug ID: 24171
Summary: [AArch64] 403050abcc091260be2e8f58484e7a39c0782b47
increased Spill/Reload/ by 5 times
Product: tools
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: opt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
For open source bzip2/decompress.c
The following commit
commit 403050abcc091260be2e8f58484e7a39c0782b47
Author: Daniel Berlin <[email protected]>
Date: Tue Feb 3 20:37:08 2015 +0000
Allow PRE to insert no-cost phi nodes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228024
91177308-0d34-0410-b5e6-96231b3b80d8
Transformed a lot of
x= GEP base, constant, constant
==>
x.pre = PHI .......
Which introduced two new long live range (base is live anyway) for each of
those GEP.
Bzip2/decompress originally has a lot of long live range already, this
transformation brought in even more, which increased the number of Spill/Reload
from 5xx to 3xxx.
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