https://bugs.llvm.org/show_bug.cgi?id=39625
Bug ID: 39625
Summary: combining addressing modes increases compile time
significantly for the testcase
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: w...@google.com
CC: llvm-bugs@lists.llvm.org
Recently we run into a compile time problem when we compiled a target. I got a
synthetic testcase to reproduce the problem. For the problematic testcase, most
of the compile time was spent on FillPlaceholders and InsertPlaceholders
functions. After disabing combing different complex addr modes, the problem
went away.
To reproduce the problem:
$ time -p ~/workarea/llvm-r345241/rbuild/bin/llc -O3 < 1.ll > /tmp/1.s
real 38.16
user 37.99
sys 0.16
$ time -p ~/workarea/llvm-r344255/rbuild/bin/llc -O3
-disable-complex-addr-modes < 1.ll > /tmp/1.s
real 6.68
user 6.56
sys 0.11
Note: The larger the 1.ll is, the more serious the problem. However, I cannot
upload file larger than 1M because of the attachment size limit. For the actual
case, without complex-addr-modes, the compilation took 60s, with
complex-addr-modes, it took >1000s.
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