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Roman Lebedev 471f397407 [NFC] ScalarEvolution: apply SSO to the ExprValueMap value 
ExprValueMap is a map from SCEV * to a set-vector of (Value *, ConstantInt *) pair,
and while the map itself will likely be big-ish (have many keys),
it is a reasonable assumption that each key will refer to a small-ish
number of pairs.

In particular looking at n=512 case from
https://bugs.llvm.org/show_bug.cgi?id=50384,
the small-size of 4 appears to be the sweet spot,
it results in the least allocations while minimizing memory footprint.
```
$ for i in $(ls heaptrack.opt.*.gz); do echo $i; heaptrack_print $i | tail -n 6; echo ""; done
heaptrack.opt.0-orig.gz
total runtime: 14.32s.
calls to allocation functions: 8222442 (574192/s)
temporary memory allocations: 2419000 (168924/s)
peak heap memory consumption: 190.98MB
peak RSS (including heaptrack overhead): 239.65MB
total memory leaked: 67.58KB

heaptrack.opt.1-n1.gz
total runtime: 13.72s.
calls to allocation functions: 7184188 (523705/s)
temporary memory allocations: 2419017 (176338/s)
peak heap memory consumption: 191.38MB
peak RSS (including heaptrack overhead): 239.64MB
total memory leaked: 67.58KB

heaptrack.opt.2-n2.gz
total runtime: 12.24s.
calls to allocation functions: 6146827 (502355/s)
temporary memory allocations: 2418997 (197695/s)
peak heap memory consumption: 163.31MB
peak RSS (including heaptrack overhead): 211.01MB
total memory leaked: 67.58KB

heaptrack.opt.3-n4.gz
total runtime: 12.28s.
calls to allocation functions: 6068532 (494260/s)
temporary memory allocations: 2418985 (197017/s)
peak heap memory consumption: 155.43MB
peak RSS (including heaptrack overhead): 201.77MB
total memory leaked: 67.58KB

heaptrack.opt.4-n8.gz
total runtime: 12.06s.
calls to allocation functions: 6068042 (503321/s)
temporary memory allocations: 2418992 (200646/s)
peak heap memory consumption: 166.03MB
peak RSS (including heaptrack overhead): 213.55MB
total memory leaked: 67.58KB

heaptrack.opt.5-n16.gz
total runtime: 12.14s.
calls to allocation functions: 6067993 (499958/s)
temporary memory allocations: 2418999 (199307/s)
peak heap memory consumption: 187.24MB
peak RSS (including heaptrack overhead): 233.69MB
total memory leaked: 67.58KB
```

While that test may be an edge worst-case scenario,
https://llvm-compile-time-tracker.com/compare.php?from=dee85d47d9f15fc268f7b18f279dac2774836615&to=98a57e31b1947d5bcdf4a5605ac2ab32b4bd5f63&stat=instructions
agrees that this also results in improvements in the usual situations.
2021-05-31 15:34:03 +03:00
benchmarks
bindings
cmake Pass -gcodeview-ghash when using clang-cl and lld-link 2021-05-27 20:49:17 -07:00
docs [LangRef] update according to unwinding support in inline asm 2021-05-31 09:01:46 +01:00
examples
include [NFC] ScalarEvolution: apply SSO to the ExprValueMap value 2021-05-31 15:34:03 +03:00
lib [NFC] ScalarEvolution: apply SSO to the ExprValueMap value 2021-05-31 15:34:03 +03:00
projects
resources
runtimes
test [SDAG] try harder to fold casts into vector compare 2021-05-31 07:14:01 -04:00
tools [llvm-objcopy][NFC] Refactor CopyConfig structure - remove lazy options processing. 2021-05-31 14:40:27 +03:00
unittests [VP] Make getMaskParamPos/getVectorLengthParamPos return unsigned. Lowercase function names. 2021-05-28 11:28:47 -07:00
utils [NFCI] Move DEBUG_TYPE definition below #includes 2021-05-30 17:31:01 +08:00
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