bjoernager/rust
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Implement min_align_of and a hacky mul_with_overflow.

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This commit is contained in:
Scott Olson 2016-03-19 11:01:33 -06:00
parent 6c6cea28bd
commit 20f152296a
2 changed files with 24 additions and 1 deletions
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23
src/interpreter.rs
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@ -339,6 +339,29 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
// TODO(tsion): Mark as dropped?
"forget" => {}
"min_align_of" => {
try!(self.memory.write_int(dest, 1, dest_size));
}
// FIXME(tsion): Handle different integer types correctly.
"mul_with_overflow" => {
let ty = *substs.types.get(subst::FnSpace, 0);
let size = self.ty_size(ty);
let left_arg = try!(self.eval_operand(&args[0]));
let right_arg = try!(self.eval_operand(&args[1]));
let left = try!(self.memory.read_int(left_arg, size));
let right = try!(self.memory.read_int(right_arg, size));
let (n, overflowed) = unsafe {
::std::intrinsics::mul_with_overflow::<i64>(left, right)
};
try!(self.memory.write_int(dest, n, size));
try!(self.memory.write_bool(dest.offset(size as isize), overflowed));
}
"offset" => {
let pointee_ty = *substs.types.get(subst::FnSpace, 0);
let pointee_size = self.ty_size(pointee_ty) as isize;