https://llvm.org/bugs/show_bug.cgi?id=25153
Bug ID: 25153
Summary: PowerPC DAG Pattern Instruction Selection Slowdown in
LLVM 3.7
Product: new-bugs
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: matt.da...@pgroup.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15059
--> https://llvm.org/bugs/attachment.cgi?id=15059&action=edit
Optimized llvm ir test
I have noted a considerable slowdown from llvm 3.5 regarding llc processing
optimized files. Compiling the attached .llvm file went from ~15 seconds to ~3
minutes.
LLVM 3.7
--------
Compile: llvm/3.7/bin/llc test.ll -mcpu=native -O2 -o test.s -time-passes
Total: 3 Minutes with 190.9secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
Compile: llvm/3.7/bin/llc test_opt.llvm -mcpu=native -O2 -o test.s -time-passes
Total: 6 Seconds with 5.4secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
LLVM 3.5
--------
Compile: llvm/3.5/bin/llc test.ll -mcpu=native -O2 -o test.s -time-passes
Total: 15 Seconds with 14.5secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
Compile: llvm/3.5/bin/llc test_opt.llvm -mcpu=native -O2 -o test.s -time-passes
Total: 1.3 Seconds with 1.01secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
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