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| author | Ayke van Laethem <[email protected]> | 2022-02-07 15:19:25 +0100 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2022-03-12 12:55:38 +0100 |
| commit | 603fff78d496445ab3d614c45c75894a9f94999e (patch) | |
| tree | d981e4616bb52bb29e7a29cbd53cfb16bcfb432a /transform/optimizer.go | |
| parent | d4b1467e4c7f1c9e89a8b9efb89a25e9cd6067b2 (diff) | |
| download | tinygo-603fff78d496445ab3d614c45c75894a9f94999e.tar.gz tinygo-603fff78d496445ab3d614c45c75894a9f94999e.zip | |
all: add support for ThinLTO
ThinLTO optimizes across LLVM modules at link time. This means that
optimizations (such as inlining and const-propagation) are possible
between C and Go. This makes this change especially useful for CGo, but
not just for CGo. By doing some optimizations at link time, the linker
can discard some unused functions and this leads to a size reduction on
average. It does increase code size in some cases, but that's true for
most optimizations.
I've excluded a number of targets for now (wasm, avr, xtensa, windows,
macos). They can probably be supported with some more work, but that
should be done in separate PRs.
Overall, this change results in an average 3.24% size reduction over all
the tinygo.org/x/drivers smoke tests.
TODO: this commit runs part of the pass pipeline twice. We should set
the PrepareForThinLTO flag in the PassManagerBuilder for even further
reduced code size (0.7%) and improved compilation speed.
Diffstat (limited to 'transform/optimizer.go')
| -rw-r--r-- | transform/optimizer.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/transform/optimizer.go b/transform/optimizer.go index 0c1d8a8f2..8e2ef7a83 100644 --- a/transform/optimizer.go +++ b/transform/optimizer.go @@ -151,6 +151,7 @@ func Optimize(mod llvm.Module, config *compileopts.Config, optLevel, sizeLevel i funcPasses.FinalizeFunc() // Run module passes. + // TODO: somehow set the PrepareForThinLTO flag in the pass manager builder. modPasses := llvm.NewPassManager() defer modPasses.Dispose() builder.Populate(modPasses) |