bjoernager/rust
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Support intrinsics::overflowing_sub for vec![x; n].

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Scott Olson 2016-03-21 03:42:34 -06:00
parent dc5fbf17ca
commit 69f41facb9
2 changed files with 20 additions and 0 deletions
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15
src/interpreter.rs
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@ -413,6 +413,21 @@ impl<'a, 'tcx: 'a, 'arena> Interpreter<'a, 'tcx, 'arena> {
}
}
// FIXME(tsion): Handle different integer types correctly. Use primvals?
"overflowing_sub" => {
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 = left.wrapping_sub(right);
try!(self.memory.write_int(dest, n, size));
}
"size_of" => {
let ty = *substs.types.get(subst::FnSpace, 0);
let size = self.ty_size(ty) as u64;