[all-commits] [llvm/llvm-project] 14cb0b: [Attributor][NFC] Replace the nested AAMap with a ...

[Johannes Doerfert via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 14cb0bdf2b6ca0b7befbb07fe9f73dad5786f59b
      https://github.com/llvm/llvm-project/commit/14cb0bdf2b6ca0b7befbb07fe9f73dad5786f59b
  Author: Johannes Doerfert <johannes at jdoerfert.de>
  Date:   2020-05-03 (Sun, 03 May 2020)

  Changed paths:
    M llvm/include/llvm/Transforms/IPO/Attributor.h
    M llvm/lib/Transforms/IPO/Attributor.cpp

  Log Message:
  -----------
  [Attributor][NFC] Replace the nested AAMap with a key pair

No functional change is intended.

---

Single run of the Attributor module and then CGSCC pass (oldPM)
for SPASS/clause.c (~10k LLVM-IR loc):

Before:
```
calls to allocation functions: 512375 (362871/s)
temporary memory allocations: 98746 (69933/s)
peak heap memory consumption: 22.54MB
peak RSS (including heaptrack overhead): 106.78MB
total memory leaked: 269.10KB
```

After:
```
calls to allocation functions: 509833 (338534/s)
temporary memory allocations: 98902 (65671/s)
peak heap memory consumption: 18.71MB
peak RSS (including heaptrack overhead): 103.00MB
total memory leaked: 269.10KB
```

Difference:
```
calls to allocation functions: -2542 (-27042/s)
temporary memory allocations: 156 (1659/s)
peak heap memory consumption: -3.83MB
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B
```