func (c *compiler) defineMemcpyFunction(fn llvm.Value) {
entry := llvm.AddBasicBlock(fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
dst, src, size := fn.Param(0), fn.Param(1), fn.Param(2)
pint8 := llvm.PointerType(llvm.Int8Type(), 0)
dst = c.builder.CreateIntToPtr(dst, pint8, "")
src = c.builder.CreateIntToPtr(src, pint8, "")
sizeType := size.Type()
sizeBits := sizeType.IntTypeWidth()
memcpyName := "llvm.memcpy.p0i8.p0i8.i" + strconv.Itoa(sizeBits)
memcpy := c.module.NamedFunction(memcpyName)
if memcpy.IsNil() {
paramtypes := []llvm.Type{
pint8, pint8, size.Type(), llvm.Int32Type(), llvm.Int1Type()}
memcpyType := llvm.FunctionType(llvm.VoidType(), paramtypes, false)
memcpy = llvm.AddFunction(c.module.Module, memcpyName, memcpyType)
}
args := []llvm.Value{
dst, src, size,
llvm.ConstInt(llvm.Int32Type(), 1, false), // single byte alignment
llvm.ConstInt(llvm.Int1Type(), 0, false), // not volatile
}
c.builder.CreateCall(memcpy, args, "")
c.builder.CreateRetVoid()
}
func (c *compiler) defineMemsetFunction(fn llvm.Value) {
entry := llvm.AddBasicBlock(fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
dst, fill, size := fn.Param(0), fn.Param(1), fn.Param(2)
sizeType := size.Type()
sizeBits := sizeType.IntTypeWidth()
memsetName := "llvm.memset.p0i8.i" + strconv.Itoa(sizeBits)
memset := c.NamedFunction(memsetName, "func f(dst *int8, fill byte, size uintptr, align int32, volatile bool)")
pint8 := memset.Type().ElementType().ParamTypes()[0]
dst = c.builder.CreateIntToPtr(dst, pint8, "")
args := []llvm.Value{
dst, fill, size,
llvm.ConstInt(llvm.Int32Type(), 1, false), // single byte alignment
llvm.ConstInt(llvm.Int1Type(), 0, false), // not volatile
}
c.builder.CreateCall(memset, args, "")
c.builder.CreateRetVoid()
}
