func arrayElementSize(t types.T) int32 {
ret := t.Size()
if t.RegSizeAlign() {
return types.RegSizeAlignUp(ret)
}
return ret
}
func buildCast(b *builder, from *ref, t types.T) *ref {
srcType := from.Type()
ret := b.newTemp(t)
if types.IsNil(srcType) {
size := t.Size()
if size == arch8.RegSize {
return newRef(t, ir.Num(0))
}
if _, ok := t.(*types.Slice); !ok {
panic("bug")
}
ret := b.newTemp(t)
b.b.Zero(ret.IR())
return ret
}
if c, ok := srcType.(*types.Const); ok {
if v, ok := types.NumConst(srcType); ok && types.IsInteger(t) {
return newRef(t, constNumIr(v, t))
}
// TODO: we do not support typed const right?
// so why need this line?
srcType = c.Type // using the underlying type
}
if types.IsInteger(t) && types.IsInteger(srcType) {
b.b.Arith(ret.IR(), nil, "cast", from.IR())
return ret
}
if regSizeCastable(t, srcType) {
b.b.Arith(ret.IR(), nil, "", from.IR())
return ret
}
panic("bug")
}
func (b *builder) newGlobalVar(t types.T, name string) ir.Ref {
name = b.anonyName(name)
return b.p.NewGlobalVar(t.Size(), name, types.IsByte(t), t.RegSizeAlign())
}
func (b *builder) newLocal(t types.T, name string) ir.Ref {
return b.f.NewLocal(t.Size(), name,
types.IsByte(t), t.RegSizeAlign(),
)
}
func (b *builder) newTempIR(t types.T) ir.Ref {
return b.f.NewTemp(t.Size(), types.IsByte(t), t.RegSizeAlign())
}