[llvm-bugs] [Bug 25280] Long compile times, high memory usage for function containing large number of inlined functions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25280

Matthias Braun <matze at braunis.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME
           Assignee|unassignedclangbugs at nondot. |matze at braunis.de
                   |org                         |

--- Comment #2 from Matthias Braun <matze at braunis.de> ---
On llvm trunk r251064 "opt -O3" requires 30 seconds for optimisation, 22
seconds for two runs of Value Propagation, which isn't great but still good for
a file this size.

The codegen part (llc -O3) requires around 8 seconds for either the optimized
or nonoptimized .ll file (top being "Eliminate PHI nodes for register
allocation" with 5 seconds) for the unoptimized file. Having PHI elimination on
the top is again strange, but 8 seconds for codegeneration is fine.

So it seems this no longer reproduces with llvm ToT. Maybe upgrading to llvm
3.7 will already be enough for you.

I'm closing this bugreport, technically the bug is still present in 3.6 but I
don't think it is worth fixing it when llvm ToT doesn't reproduce.

opt-top:
   ---User Time---   --System Time--   --User+System--   ---Wall Time---  ---
Name ---
  11.9388 ( 42.4%)   0.7151 ( 35.9%)  12.6539 ( 41.9%)  12.6571 ( 41.9%)  Value
Propagation
  11.4563 ( 40.6%)   0.7037 ( 35.4%)  12.1600 ( 40.3%)  12.1624 ( 40.3%)  Value
Propagation
   1.3507 (  4.8%)   0.0091 (  0.5%)   1.3598 (  4.5%)   1.3600 (  4.5%) 
Global Value Numbering
   0.5758 (  2.0%)   0.0107 (  0.5%)   0.5866 (  1.9%)   0.5865 (  1.9%) 
Function Integration/Inlining
   0.1924 (  0.7%)   0.1918 (  9.6%)   0.3841 (  1.3%)   0.3841 (  1.3%)  Lazy
Value Information Analysis
   0.1918 (  0.7%)   0.1914 (  9.6%)   0.3832 (  1.3%)   0.3833 (  1.3%)  Lazy
Value Information Analysis
   0.2077 (  0.7%)   0.0041 (  0.2%)   0.2119 (  0.7%)   0.2119 (  0.7%) 
Combine redundant instructions
   0.1389 (  0.5%)   0.0030 (  0.2%)   0.1418 (  0.5%)   0.1418 (  0.5%) 
Combine redundant instructions
   0.1340 (  0.5%)   0.0013 (  0.1%)   0.1353 (  0.4%)   0.1353 (  0.4%) 
Combine redundant instructions
   0.1139 (  0.4%)   0.0032 (  0.2%)   0.1171 (  0.4%)   0.1170 (  0.4%) 
Combine redundant instructions
   0.1109 (  0.4%)   0.0026 (  0.1%)   0.1135 (  0.4%)   0.1134 (  0.4%) 
Combine redundant instructions
   0.1025 (  0.4%)   0.0026 (  0.1%)   0.1051 (  0.3%)   0.1050 (  0.3%) 
Combine redundant instructions
   0.0759 (  0.3%)   0.0139 (  0.7%)   0.0898 (  0.3%)   0.0903 (  0.3%)  Print
module to stderr
   0.0855 (  0.3%)   0.0002 (  0.0%)   0.0857 (  0.3%)   0.0857 (  0.3%) 
Induction Variable Simplification
   0.0829 (  0.3%)   0.0018 (  0.1%)   0.0847 (  0.3%)   0.0847 (  0.3%) 
Combine redundant instru

llc-top:
   5.0728 ( 59.5%)   0.0057 (  2.6%)   5.0784 ( 58.1%)   5.0816 ( 57.9%) 
Eliminate PHI nodes for register allocation
   1.2483 ( 14.7%)   0.1065 ( 48.7%)   1.3548 ( 15.5%)   1.3741 ( 15.7%)  X86
DAG->DAG Instruction Selection
   0.3867 (  4.5%)   0.0120 (  5.5%)   0.3987 (  4.6%)   0.3988 (  4.5%)  Merge
disjoint stack slots
   0.2768 (  3.2%)   0.0116 (  5.3%)   0.2884 (  3.3%)   0.2887 (  3.3%) 
Greedy Register Allocator
   0.2743 (  3.2%)   0.0022 (  1.0%)   0.2765 (  3.2%)   0.2769 (  3.2%) 
Simple Register Coalescing
   0.1547 (  1.8%)   0.0009 (  0.4%)   0.1556 (  1.8%)   0.1566 (  1.8%) 
Machine Instruction Scheduler
   0.0932 (  1.1%)   0.0104 (  4.7%)   0.1036 (  1.2%)   0.1036 (  1.2%)  Live
Interval Analysis
   0.0780 (  0.9%)   0.0099 (  4.6%)   0.0880 (  1.0%)   0.0947 (  1.1%)  X86
Assembly / Object Emitter
   0.0873 (  1.0%)   0.0036 (  1.7%)   0.0910 (  1.0%)   0.0909 (  1.0%)  Live
Variable Analysis
   0.0608 (  0.7%)   0.0003 (  0.1%)   0.0611 (  0.7%)   0.0611 (  0.7%) 
Control Flow Optimizer
   0.0503 (  0.6%)   0.0010 (  0.5%)   0.0513 (  0.6%)   0.0513 (  0.6%) 
Machine Common Subexpression Elimination
   0.0454 (  0.5%)   0.0006 (  0.3%)   0.0460 (  0.5%)   0.0477 (  0.5%) 
CodeGen Prepare
   0.0454 (  0.5%)   0.0014 (  0.6%)   0.0468 (  0.5%)   0.0468 (  0.5%) 
Virtual Register Rewriter
   0.0386 (  0.5%)   0.0006 (  0.3%)   0.0392 (  0.4%)   0.0391 (  0.4%) 
Prologue/Epilogue Insertion & Frame Finalization
   0.0357 (  0.4%)   0.0006 (  0.3%)   0.0363 (  0.4%)   0.0363 (  0.4%) 
Module Verifier
   0.0337 (  0.4%)   0.0006 (  0.3%)   0.0343 (  0.4%)   0.0343 (  0.4%) 
Module Verifier

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