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Add an early TailMerge pass (#2721)

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* Add an early `TailMerge` pass

Some translations can have a lot of guest calls and since for each guest
call there is a call guard which may return. This can produce a lot of
epilogue code for returns. This pass merges the epilogue into a single
block.

```
Using filter 'hcq'.
Using metric 'code size'.

Total diff: -1648111 (-7.19 %) (bytes):
  Base: 22913847
  Diff: 21265736

Improved: 4567, regressed: 14, unchanged: 144
```

* Set PTC version

* Address feedback

* Handle `void` returning functions

* Actually handle `void` returning functions

* Fix `RegisterToLocal` logging
This commit is contained in:
FICTURE7 2021-10-19 02:51:22 +04:00 • committed by GitHub
parent d512ce122c
commit fbf40424f4
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 148 additions and 26 deletions
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7
ARMeilleure/CodeGen/Optimizations/BlockPlacement.cs
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@ -17,7 +17,7 @@ namespace ARMeilleure.CodeGen.Optimizations
BasicBlock lastBlock = cfg.Blocks.Last;
// Move cold blocks at the end of the list, so that they are emitted away from hot code.
for (block = cfg.Blocks.First; block != lastBlock; block = nextBlock)
for (block = cfg.Blocks.First; block != null; block = nextBlock)
{
nextBlock = block.ListNext;
@ -26,6 +26,11 @@ namespace ARMeilleure.CodeGen.Optimizations
cfg.Blocks.Remove(block);
cfg.Blocks.AddLast(block);
}
if (block == lastBlock)
{
break;
}
}
for (block = cfg.Blocks.First; block != null; block = nextBlock)