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builder, compiler: compile and cache packages in parallel

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This commit switches from the previous behavior of compiling the whole
program at once, to compiling every package in parallel and linking the
LLVM bitcode files together for further whole-program optimization.
This is a small performance win, but it has several advantages in the
future:

  - There are many more things that can be done per package in parallel,
    avoiding the bottleneck at the end of the compiler phase. This
    should speed up the compiler futher.
  - This change is a necessary step towards a non-LTO build mode for
    fast incremental builds that only rebuild the changed package, when
    compiler speed is more important than binary size.
  - This change refactors the compiler in such a way that it will be
    easier to inspect the IR for one package only. Inspecting this IR
    will be very helpful for compiler developers.
This commit is contained in:
Ayke van Laethem
2021-01-31 20:52:18 +01:00
committed by Ron Evans
parent dc1ff80e10
commit e2f532709f
21 changed files with 404 additions and 189 deletions
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compiler/testdata/pointer.ll
Vendored
+10 -8
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@@ -3,46 +3,48 @@ source_filename = "pointer.go"
target datalayout = "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i686--linux"
define internal void @main.init(i8* %context, i8* %parentHandle) unnamed_addr {
declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr {
entry:
ret void
}
define internal [0 x i32] @main.pointerDerefZero([0 x i32]* %x, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden [0 x i32] @main.pointerDerefZero([0 x i32]* %x, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
ret [0 x i32] zeroinitializer
}
define internal i32* @main.pointerCastFromUnsafe(i8* %x, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i32* @main.pointerCastFromUnsafe(i8* %x, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = bitcast i8* %x to i32*
ret i32* %0
}
define internal i8* @main.pointerCastToUnsafe(i32* dereferenceable_or_null(4) %x, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i8* @main.pointerCastToUnsafe(i32* dereferenceable_or_null(4) %x, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = bitcast i32* %x to i8*
ret i8* %0
}
define internal i8* @main.pointerCastToUnsafeNoop(i8* dereferenceable_or_null(1) %x, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i8* @main.pointerCastToUnsafeNoop(i8* dereferenceable_or_null(1) %x, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
ret i8* %x
}
define internal i8* @main.pointerUnsafeGEPFixedOffset(i8* dereferenceable_or_null(1) %ptr, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i8* @main.pointerUnsafeGEPFixedOffset(i8* dereferenceable_or_null(1) %ptr, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = getelementptr inbounds i8, i8* %ptr, i32 10
ret i8* %0
}
define internal i8* @main.pointerUnsafeGEPByteOffset(i8* dereferenceable_or_null(1) %ptr, i32 %offset, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i8* @main.pointerUnsafeGEPByteOffset(i8* dereferenceable_or_null(1) %ptr, i32 %offset, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = getelementptr inbounds i8, i8* %ptr, i32 %offset
ret i8* %0
}
define internal i32* @main.pointerUnsafeGEPIntOffset(i32* dereferenceable_or_null(4) %ptr, i32 %offset, i8* %context, i8* %parentHandle) unnamed_addr {
define hidden i32* @main.pointerUnsafeGEPIntOffset(i32* dereferenceable_or_null(4) %ptr, i32 %offset, i8* %context, i8* %parentHandle) unnamed_addr {
entry:
%0 = getelementptr i32, i32* %ptr, i32 %offset
ret i32* %0