package compiler // This file contains helper functions to create calls to LLVM intrinsics. import ( "strconv" "golang.org/x/tools/go/ssa" "tinygo.org/x/go-llvm" ) // createMemoryCopyCall creates a call to a builtin LLVM memcpy or memmove // function, declaring this function if needed. These calls are treated // specially by optimization passes possibly resulting in better generated code, // and will otherwise be lowered to regular libc memcpy/memmove calls. func (b *builder) createMemoryCopyCall(fn *ssa.Function, args []ssa.Value) (llvm.Value, error) { fnName := "llvm." + fn.Name() + ".p0i8.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth()) llvmFn := b.mod.NamedFunction(fnName) if llvmFn.IsNil() { fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.i8ptrType, b.uintptrType, b.ctx.Int1Type()}, false) llvmFn = llvm.AddFunction(b.mod, fnName, fnType) } var params []llvm.Value for _, param := range args { params = append(params, b.getValue(param)) } params = append(params, llvm.ConstInt(b.ctx.Int1Type(), 0, false)) b.CreateCall(llvmFn, params, "") return llvm.Value{}, nil } // createMemoryZeroCall creates calls to llvm.memset.* to zero a block of // memory, declaring the function if needed. These calls will be lowered to // regular libc memset calls if they aren't optimized out in a different way. func (b *builder) createMemoryZeroCall(args []ssa.Value) (llvm.Value, error) { fnName := "llvm.memset.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth()) llvmFn := b.mod.NamedFunction(fnName) if llvmFn.IsNil() { fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.ctx.Int8Type(), b.uintptrType, b.ctx.Int1Type()}, false) llvmFn = llvm.AddFunction(b.mod, fnName, fnType) } params := []llvm.Value{ b.getValue(args[0]), llvm.ConstInt(b.ctx.Int8Type(), 0, false), b.getValue(args[1]), llvm.ConstInt(b.ctx.Int1Type(), 0, false), } b.CreateCall(llvmFn, params, "") return llvm.Value{}, nil }