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Extremely slow compilation in -O1 and -O2 #16739

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llvmbot opened this issue Jun 19, 2013 · 8 comments
Closed

Extremely slow compilation in -O1 and -O2 #16739

llvmbot opened this issue Jun 19, 2013 · 8 comments
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@atrick
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bugzilla Issues migrated from bugzilla c++

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@llvmbot
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llvmbot commented Jun 19, 2013

Bugzilla Link 16365
Resolution FIXED
Resolved on Apr 07, 2014 16:31
Version 3.2
OS All
Attachments source file showing problem.
Reporter LLVM Bugzilla Contributor
CC @atrick,@Axel-Naumann,@DougGregor,@echristo

Extended Description

Very slow compilation of large but very simple source file.

$ time clang++ -O2 -c biggraph.C

real 1m21.025s
user 1m19.286s
sys 0m1.734s

$ time g++-4 -O2 -c biggraph.C [ g++ 4.8.1]

real 0m9.375s
user 0m9.191s
sys 0m0.176s
@llvmbot
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llvmbot commented Jun 19, 2013

assigned to @atrick

@llvmbot
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llvmbot commented Jun 19, 2013

The -ftime-report gives:

$ time clang++ -ftime-report -O1 -c biggraph.C
===-------------------------------------------------------------------------===
Register Allocation
===-------------------------------------------------------------------------===
Total Execution Time: 0.0052 seconds (0.0052 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
0.0026 ( 56.2%) 0.0005 ( 74.2%) 0.0030 ( 58.4%) 0.0030 ( 58.4%) Local Splitting
0.0019 ( 41.7%) 0.0001 ( 22.2%) 0.0021 ( 39.4%) 0.0021 ( 39.4%) Seed Live Regs
0.0001 ( 1.9%) 0.0000 ( 1.5%) 0.0001 ( 1.8%) 0.0001 ( 1.8%) Spiller
0.0000 ( 0.2%) 0.0000 ( 2.1%) 0.0000 ( 0.4%) 0.0000 ( 0.3%) Evict
0.0046 (100.0%) 0.0006 (100.0%) 0.0052 (100.0%) 0.0052 (100.0%) Total

===-------------------------------------------------------------------------===
Instruction Selection and Scheduling
===-------------------------------------------------------------------------===
Total Execution Time: 83.6459 seconds (83.6467 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
80.1686 ( 97.8%) 1.6332 ( 96.8%) 81.8019 ( 97.8%) 81.8027 ( 97.8%) Instruction Scheduling
1.3140 ( 1.6%) 0.0162 ( 1.0%) 1.3302 ( 1.6%) 1.3301 ( 1.6%) Instruction Creation
0.1647 ( 0.2%) 0.0053 ( 0.3%) 0.1700 ( 0.2%) 0.1700 ( 0.2%) DAG Legalization
0.1666 ( 0.2%) 0.0024 ( 0.1%) 0.1689 ( 0.2%) 0.1689 ( 0.2%) Instruction Selection
0.0629 ( 0.1%) 0.0208 ( 1.2%) 0.0837 ( 0.1%) 0.0837 ( 0.1%) Vector Legalization
0.0351 ( 0.0%) 0.0019 ( 0.1%) 0.0370 ( 0.0%) 0.0370 ( 0.0%) DAG Combining 2
0.0298 ( 0.0%) 0.0002 ( 0.0%) 0.0300 ( 0.0%) 0.0300 ( 0.0%) Type Legalization
0.0150 ( 0.0%) 0.0018 ( 0.1%) 0.0168 ( 0.0%) 0.0168 ( 0.0%) DAG Combining 1
0.0023 ( 0.0%) 0.0051 ( 0.3%) 0.0074 ( 0.0%) 0.0074 ( 0.0%) Instruction Scheduling Cleanup
81.9589 (100.0%) 1.6870 (100.0%) 83.6459 (100.0%) 83.6467 (100.0%) Total

===-------------------------------------------------------------------------===
DWARF Emission
===-------------------------------------------------------------------------===
Total Execution Time: 0.0020 seconds (0.0020 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
0.0016 ( 83.6%) 0.0000 ( 72.7%) 0.0017 ( 83.5%) 0.0017 ( 83.4%) DWARF Exception Writer
0.0003 ( 16.4%) 0.0000 ( 27.3%) 0.0003 ( 16.5%) 0.0003 ( 16.6%) DWARF Debug Writer
0.0020 (100.0%) 0.0000 (100.0%) 0.0020 (100.0%) 0.0020 (100.0%) Total

===-------------------------------------------------------------------------===
... Pass execution timing report ...
===-------------------------------------------------------------------------===
Total Execution Time: 84.5942 seconds (84.5949 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
82.0843 ( 99.1%) 1.7079 ( 98.6%) 83.7922 ( 99.1%) 83.7930 ( 99.1%) X86 DAG->DAG Instruction Selection
0.3889 ( 0.5%) 0.0018 ( 0.1%) 0.3906 ( 0.5%) 0.3906 ( 0.5%) Greedy Register Allocator
0.0540 ( 0.1%) 0.0023 ( 0.1%) 0.0563 ( 0.1%) 0.0562 ( 0.1%) Live Variable Analysis
0.0510 ( 0.1%) 0.0004 ( 0.0%) 0.0514 ( 0.1%) 0.0513 ( 0.1%) Machine Common Subexpression Elimination
0.0442 ( 0.1%) 0.0017 ( 0.1%) 0.0459 ( 0.1%) 0.0459 ( 0.1%) X86 AT&T-Style Assembly Printer
0.0176 ( 0.0%) 0.0078 ( 0.4%) 0.0254 ( 0.0%) 0.0254 ( 0.0%) Machine Function Analysis
0.0194 ( 0.0%) 0.0005 ( 0.0%) 0.0199 ( 0.0%) 0.0199 ( 0.0%) Simple Register Coalescing
0.0129 ( 0.0%) 0.0039 ( 0.2%) 0.0167 ( 0.0%) 0.0167 ( 0.0%) Live Interval Analysis
0.0147 ( 0.0%) 0.0000 ( 0.0%) 0.0147 ( 0.0%) 0.0147 ( 0.0%) Virtual Register Rewriter
0.0117 ( 0.0%) 0.0010 ( 0.1%) 0.0128 ( 0.0%) 0.0128 ( 0.0%) Two-Address instruction pass
0.0116 ( 0.0%) 0.0007 ( 0.0%) 0.0124 ( 0.0%) 0.0124 ( 0.0%) Peephole Optimizations
0.0099 ( 0.0%) 0.0022 ( 0.1%) 0.0121 ( 0.0%) 0.0121 ( 0.0%) Prologue/Epilogue Insertion & Frame Finalization
0.0114 ( 0.0%) 0.0000 ( 0.0%) 0.0114 ( 0.0%) 0.0114 ( 0.0%) Machine Copy Propagation Pass
0.0113 ( 0.0%) 0.0000 ( 0.0%) 0.0113 ( 0.0%) 0.0113 ( 0.0%) Combine redundant instructions
0.0108 ( 0.0%) 0.0001 ( 0.0%) 0.0109 ( 0.0%) 0.0109 ( 0.0%) Combine redundant instructions
0.0106 ( 0.0%) 0.0003 ( 0.0%) 0.0109 ( 0.0%) 0.0109 ( 0.0%) Combine redundant instructions
0.0105 ( 0.0%) 0.0000 ( 0.0%) 0.0105 ( 0.0%) 0.0105 ( 0.0%) Combine redundant instructions
0.0104 ( 0.0%) 0.0001 ( 0.0%) 0.0105 ( 0.0%) 0.0105 ( 0.0%) Calculate spill weights
0.0103 ( 0.0%) 0.0001 ( 0.0%) 0.0103 ( 0.0%) 0.0103 ( 0.0%) Combine redundant instructions
0.0076 ( 0.0%) 0.0000 ( 0.0%) 0.0076 ( 0.0%) 0.0076 ( 0.0%) Remove dead machine instructions
0.0064 ( 0.0%) 0.0010 ( 0.1%) 0.0074 ( 0.0%) 0.0074 ( 0.0%) Slot index numbering
0.0058 ( 0.0%) 0.0000 ( 0.0%) 0.0059 ( 0.0%) 0.0059 ( 0.0%) Slot index numbering
0.0048 ( 0.0%) 0.0001 ( 0.0%) 0.0048 ( 0.0%) 0.0048 ( 0.0%) Scalar Replacement of Aggregates (DT)
0.0037 ( 0.0%) 0.0001 ( 0.0%) 0.0038 ( 0.0%) 0.0038 ( 0.0%) Dead Store Elimination
0.0036 ( 0.0%) 0.0000 ( 0.0%) 0.0036 ( 0.0%) 0.0036 ( 0.0%) Post-RA pseudo instruction expansion pass
0.0035 ( 0.0%) 0.0000 ( 0.0%) 0.0036 ( 0.0%) 0.0036 ( 0.0%) Early CSE
0.0033 ( 0.0%) 0.0000 ( 0.0%) 0.0033 ( 0.0%) 0.0033 ( 0.0%) Optimize for code generation
0.0032 ( 0.0%) 0.0000 ( 0.0%) 0.0032 ( 0.0%) 0.0032 ( 0.0%) Early CSE
0.0031 ( 0.0%) 0.0000 ( 0.0%) 0.0031 ( 0.0%) 0.0031 ( 0.0%) Execution dependency fix
0.0023 ( 0.0%) 0.0002 ( 0.0%) 0.0024 ( 0.0%) 0.0024 ( 0.0%) Basic CallGraph Construction
0.0021 ( 0.0%) 0.0000 ( 0.0%) 0.0021 ( 0.0%) 0.0021 ( 0.0%) Sparse Conditional Constant Propagation
0.0019 ( 0.0%) 0.0000 ( 0.0%) 0.0019 ( 0.0%) 0.0019 ( 0.0%) Aggressive Dead Code Elimination
0.0017 ( 0.0%) 0.0000 ( 0.0%) 0.0017 ( 0.0%) 0.0017 ( 0.0%) Simplify the CFG
0.0016 ( 0.0%) 0.0000 ( 0.0%) 0.0017 ( 0.0%) 0.0017 ( 0.0%) Debug Variable Analysis
0.0016 ( 0.0%) 0.0000 ( 0.0%) 0.0016 ( 0.0%) 0.0016 ( 0.0%) X86 FP Stackifier
0.0014 ( 0.0%) 0.0000 ( 0.0%) 0.0014 ( 0.0%) 0.0014 ( 0.0%) Reassociate expressions
0.0012 ( 0.0%) 0.0000 ( 0.0%) 0.0012 ( 0.0%) 0.0012 ( 0.0%) Interprocedural Sparse Conditional Constant Propagation
0.0009 ( 0.0%) 0.0000 ( 0.0%) 0.0009 ( 0.0%) 0.0009 ( 0.0%) Tail Call Elimination
0.0009 ( 0.0%) 0.0000 ( 0.0%) 0.0009 ( 0.0%) 0.0009 ( 0.0%) Process Implicit Definitions
0.0009 ( 0.0%) 0.0000 ( 0.0%) 0.0009 ( 0.0%) 0.0009 ( 0.0%) Expand ISel Pseudo-instructions
0.0008 ( 0.0%) 0.0000 ( 0.0%) 0.0008 ( 0.0%) 0.0008 ( 0.0%) MemCpy Optimization
0.0006 ( 0.0%) 0.0000 ( 0.0%) 0.0006 ( 0.0%) 0.0006 ( 0.0%) Remove unused exception handling info
0.0005 ( 0.0%) 0.0000 ( 0.0%) 0.0005 ( 0.0%) 0.0005 ( 0.0%) Simplify well-known library calls
0.0004 ( 0.0%) 0.0000 ( 0.0%) 0.0004 ( 0.0%) 0.0004 ( 0.0%) Simplify the CFG
0.0001 ( 0.0%) 0.0002 ( 0.0%) 0.0003 ( 0.0%) 0.0003 ( 0.0%) Virtual Register Map
0.0003 ( 0.0%) 0.0000 ( 0.0%) 0.0003 ( 0.0%) 0.0003 ( 0.0%) Simplify the CFG
0.0003 ( 0.0%) 0.0000 ( 0.0%) 0.0003 ( 0.0%) 0.0003 ( 0.0%) Value Propagation
0.0003 ( 0.0%) 0.0000 ( 0.0%) 0.0003 ( 0.0%) 0.0003 ( 0.0%) Lower 'expect' Intrinsics
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Insert stack protectors
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Inliner for always_inline functions
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Simplify the CFG
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Simplify the CFG
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Global Variable Optimizer
0.0002 ( 0.0%) 0.0000 ( 0.0%) 0.0002 ( 0.0%) 0.0002 ( 0.0%) Value Propagation
0.0001 ( 0.0%) 0.0000 ( 0.0%) 0.0001 ( 0.0%) 0.0001 ( 0.0%) Live Register Matrix
0.0001 ( 0.0%) 0.0000 ( 0.0%) 0.0001 ( 0.0%) 0.0001 ( 0.0%) X86 Maximal Stack Alignment Check
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Deduce function attributes
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Control Flow Optimizer
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine code sinking
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) MachineDominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Natural Loop Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Natural Loop Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Loop Invariant Code Motion
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dead Argument Elimination
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Natural Loop Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Remove unreachable machine basic blocks
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Exception handling preparation
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Eliminate PHI nodes for register allocation
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) MachineDominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Block Frequency Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Tail Duplication
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Post RA top-down list latency scheduler
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Branch Probability Basic Block Placement
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) MachineDominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Branch Probability Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Local Stack Slot Allocation
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Jump Threading
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Strip Unused Function Prototypes
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Scalar Evolution Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Bundle Machine CFG Edges
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Stack Slot Coloring
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Dominator Tree Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Memory Dependence Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Natural Loop Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Basic Alias Analysis (stateless AA impl)
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Natural Loop Construction
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Jump Threading
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Target Library Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Spill Code Placement Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Merge disjoint stack slots
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Tail Duplication
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Loop Invariant Code Motion
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Lower Garbage Collection Instructions
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Analyze Machine Code For Garbage Collection
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Scalar Evolution Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Remove unreachable blocks from the CFG
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Optimize machine instruction PHIs
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Live Stack Slot Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Bundle Machine CFG Edges
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Scalar Replacement of Aggregates (SSAUp)
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Lazy Value Information Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Create Garbage Collector Module Metadata
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Memory Dependence Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Delete Garbage Collector Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Target Pass Configuration
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Target Library Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Module Information
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Machine Branch Probability Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Lazy Value Information Analysis
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) Basic Alias Analysis (stateless AA impl)
82.8616 (100.0%) 1.7326 (100.0%) 84.5942 (100.0%) 84.5949 (100.0%) Total

===-------------------------------------------------------------------------===
Miscellaneous Ungrouped Timers
===-------------------------------------------------------------------------===

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
83.1012 ( 50.0%) 1.7594 ( 50.2%) 84.8606 ( 50.0%) 84.8660 ( 50.0%) Clang front-end timer
82.8838 ( 49.9%) 1.7383 ( 49.6%) 84.6221 ( 49.9%) 84.6275 ( 49.9%) Code Generation Time
0.0640 ( 0.0%) 0.0064 ( 0.2%) 0.0704 ( 0.0%) 0.0704 ( 0.0%) LLVM IR Generation Time
166.0490 (100.0%) 3.5041 (100.0%) 169.5531 (100.0%) 169.5639 (100.0%) Total

real 1m24.886s
user 1m23.106s
sys 0m1.766s

@echristo
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Was just putting that in...

@atrick
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atrick commented Jun 19, 2013

I'm assuming -pre-RA-sched=source has the same problem.

I'd like to replace the SD scheduler pass completely with a SD serialization pass. That won't happen for at least another month. But when it does happen I'll be able to close this.

@echristo
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Appears so and I'm good with that solution.

How about you take this and close then?

@Axel-Naumann
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Dear Andrew,

We are getting more and more reports of this. Do you have an updated estimate? Your first one ("at least another month") was already correct ;-) Or did you replace the pass and that didn't help?

Cheers, Axel.

@atrick
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atrick commented Apr 5, 2014

Thanks for pinging me on this! I have not been able to work on replacing the SD scheduler pass, so should have committed a quick fix earlier. I'm waiting on benchmark results but should have a quick workaround checked in Monday at the latest.

@atrick
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atrick commented Apr 7, 2014

Fixed in r205738. I added a workaround to ClusterNeighboringLoads.

time /b/fix/RA/bin/clang++ -O2 -c biggraph.C

real 0m6.143s
user 0m6.016s
sys 0m0.120s

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 9, 2021
This issue was closed.
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