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Ayke van Laethem
eaa54bc7e3
This replaces the custom runtime.memcpy and runtime.memmove functions with calls to LLVM builtins that should hopefully allow LLVM to better optimize such calls. They will be lowered to regular libc memcpy/memmove when they can't be optimized away. When testing this change with some smoke tests, I found that many smoke tests resulted in slightly larger binary sizes with this commit applied. I looked into it and it appears that machine.sendUSBPacket was not inlined before while it is with this commit applied. Additionally, when I compared all driver smoke tests with -opt=1 I saw that many were reduced slightly in binary size and none increased in size.
31 lines
1.1 KiB
Go
31 lines
1.1 KiB
Go
package compiler
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// This file contains helper functions to create calls to LLVM intrinsics.
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import (
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"strconv"
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"golang.org/x/tools/go/ssa"
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"tinygo.org/x/go-llvm"
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)
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// createMemoryCopyCall creates a call to a builtin LLVM memcpy or memmove
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// function, declaring this function if needed. These calls are treated
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// specially by optimization passes possibly resulting in better generated code,
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// and will otherwise be lowered to regular libc memcpy/memmove calls.
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func (b *builder) createMemoryCopyCall(fn *ssa.Function, args []ssa.Value) (llvm.Value, error) {
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fnName := "llvm." + fn.Name() + ".p0i8.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
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llvmFn := b.mod.NamedFunction(fnName)
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if llvmFn.IsNil() {
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fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.i8ptrType, b.uintptrType, b.ctx.Int1Type()}, false)
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llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
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}
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var params []llvm.Value
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for _, param := range args {
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params = append(params, b.getValue(param))
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}
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params = append(params, llvm.ConstInt(b.ctx.Int1Type(), 0, false))
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b.CreateCall(llvmFn, params, "")
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return llvm.Value{}, nil
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}
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