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all: add support for ThinLTO

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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.
This commit is contained in:
Ayke van Laethem
2022-02-07 15:19:25 +01:00
committed by Ron Evans
parent d4b1467e4c
commit 603fff78d4
8 changed files with 121 additions and 25 deletions
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transform/testdata/stacksize.out.ll
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@@ -2,6 +2,7 @@ target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7m-none-eabi"
@"internal/task.stackSizes" = global [1 x i32] [i32 1024], section ".tinygo_stacksizes"
@llvm.used = appending global [2 x i8*] [i8* bitcast ([1 x i32]* @"internal/task.stackSizes" to i8*), i8* bitcast (void (i8*)* @"runtime.run$1$gowrapper" to i8*)]
declare i32 @"internal/task.getGoroutineStackSize"(i32, i8*, i8*)