[llvm] 639b8da - [Attributor] KindToAbstractAttributeMap: use SmallDenseMap
Roman Lebedev via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 15 14:13:45 PDT 2020
Author: Roman Lebedev
Date: 2020-04-16T00:12:45+03:00
New Revision: 639b8da8dc4cb735e8fd001b7e674073365ff230
URL: https://github.com/llvm/llvm-project/commit/639b8da8dc4cb735e8fd001b7e674073365ff230
DIFF: https://github.com/llvm/llvm-project/commit/639b8da8dc4cb735e8fd001b7e674073365ff230.diff
LOG: [Attributor] KindToAbstractAttributeMap: use SmallDenseMap
Summary:
While this is less efficient to allocate huge `SmallDenseMap` for each `IRPosition` in `AAMap`,
in the larger picture this is much better, since we'd eventually either fill each `IRPosition`,
with each possible attribute, or at least quert for it, which would allocate it anyway.
So we are better off pre-allocating.
Old:
```
0.3460 ( 40.7%) 0.0183 ( 33.9%) 0.3643 ( 40.3%) 0.3644 ( 40.3%) Deduce and propagate attributes (CGSCC pass)
0.1135 ( 13.4%) 0.0080 ( 14.7%) 0.1215 ( 13.4%) 0.1215 ( 13.4%) Deduce and propagate attributes
```
```
total runtime: 19.48s.
bytes allocated in total (ignoring deallocations): 575.02MB (29.51MB/s)
calls to allocation functions: 908876 (46644/s)
temporary memory allocations: 276654 (14198/s)
peak heap memory consumption: 26.68MB
peak RSS (including heaptrack overhead): 944.78MB
total memory leaked: 8.85MB
```
New:
```
0.3223 ( 38.1%) 0.0299 ( 53.6%) 0.3522 ( 39.1%) 0.3522 ( 39.1%) Deduce and propagate attributes (CGSCC pass)
0.1150 ( 13.6%) 0.0037 ( 6.7%) 0.1188 ( 13.2%) 0.1188 ( 13.2%) Deduce and propagate attributes
```
```
total runtime: 19.06s.
bytes allocated in total (ignoring deallocations): 363.21MB (19.06MB/s)
calls to allocation functions: 679660 (35658/s)
temporary memory allocations: 83472 (4379/s)
peak heap memory consumption: 27.00MB
peak RSS (including heaptrack overhead): 931.66MB
total memory leaked: 8.85MB
```
Diff:
```
total runtime: -0.42s.
bytes allocated in total (ignoring deallocations): -211.81MB (498.38MB/s)
calls to allocation functions: -229216 (539331/s)
temporary memory allocations: -193182 (454545/s)
peak heap memory consumption: 321.54KB
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B
```
Reviewers: jdoerfert, sstefan1, uenoku
Reviewed By: jdoerfert
Subscribers: uenoku, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78231
Added:
Modified:
llvm/include/llvm/Transforms/IPO/Attributor.h
Removed:
################################################################################
diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
index fca353f539a8..aa7885915176 100644
--- a/llvm/include/llvm/Transforms/IPO/Attributor.h
+++ b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -1207,7 +1207,7 @@ struct Attributor {
/// the inner level.
///{
using KindToAbstractAttributeMap =
- DenseMap<const char *, AbstractAttribute *>;
+ SmallDenseMap<const char *, AbstractAttribute *, /*InlineBuckets=*/32>;
DenseMap<IRPosition, KindToAbstractAttributeMap> AAMap;
///}
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