Remark eqm_mul_2p32:
  forall x y, Int.eqm x y -> eqm (x * two_p 32) (y * two_p 32).

(* Specifications: *)
Lemma ofwords_add'': forall lo hi, signed (ofwords hi lo) = Int.signed hi * two_p 32 + Int.unsigned lo.
Lemma decompose_bitwise_binop: forall f f64 f32 xh xl yh yl, (forall x y i, 0 <= i < zwordsize -> testbit (f64 x y) i = f (testbit x i) (testbit y i)) -> (forall x y i, 0 <= i < Int.zwordsize -> Int.testbit (f32 x y) i = f (Int.testbit x i) (Int.testbit y i)) -> f64 (ofwords xh xl) (ofwords yh yl) = ofwords (f32 xh yh) (f32 xl yl).
Lemma decompose_and: forall xh xl yh yl, and (ofwords xh xl) (ofwords yh yl) = ofwords (Int.and xh yh) (Int.and xl yl).
Lemma decompose_or: forall xh xl yh yl, or (ofwords xh xl) (ofwords yh yl) = ofwords (Int.or xh yh) (Int.or xl yl).
Lemma decompose_xor: forall xh xl yh yl, xor (ofwords xh xl) (ofwords yh yl) = ofwords (Int.xor xh yh) (Int.xor xl yl).
Lemma decompose_not: forall xh xl, not (ofwords xh xl) = ofwords (Int.not xh) (Int.not xl).
Lemma decompose_shl_1: forall xh xl y, 0 <= Int.unsigned y < Int.zwordsize -> shl' (ofwords xh xl) y = ofwords (Int.or (Int.shl xh y) (Int.shru xl (Int.sub Int.iwordsize y))) (Int.shl xl y).
Lemma decompose_shl_2: forall xh xl y, Int.zwordsize <= Int.unsigned y < zwordsize -> shl' (ofwords xh xl) y = ofwords (Int.shl xl (Int.sub y Int.iwordsize)) Int.zero.
Lemma decompose_shru_1: forall xh xl y, 0 <= Int.unsigned y < Int.zwordsize -> shru' (ofwords xh xl) y = ofwords (Int.shru xh y) (Int.or (Int.shru xl y) (Int.shl xh (Int.sub Int.iwordsize y))).
Lemma decompose_shru_2: forall xh xl y, Int.zwordsize <= Int.unsigned y < zwordsize -> shru' (ofwords xh xl) y = ofwords Int.zero (Int.shru xh (Int.sub y Int.iwordsize)).
Lemma decompose_shr_1: forall xh xl y, 0 <= Int.unsigned y < Int.zwordsize -> shr' (ofwords xh xl) y = ofwords (Int.shr xh y) (Int.or (Int.shru xl y) (Int.shl xh (Int.sub Int.iwordsize y))).
Lemma decompose_shr_2: forall xh xl y, Int.zwordsize <= Int.unsigned y < zwordsize -> shr' (ofwords xh xl) y = ofwords (Int.shr xh (Int.sub Int.iwordsize Int.one)) (Int.shr xh (Int.sub y Int.iwordsize)).
Lemma decompose_add: forall xh xl yh yl, add (ofwords xh xl) (ofwords yh yl) = ofwords (Int.add (Int.add xh yh) (Int.add_carry xl yl Int.zero)) (Int.add xl yl).
Lemma decompose_sub: forall xh xl yh yl, sub (ofwords xh xl) (ofwords yh yl) = ofwords (Int.sub (Int.sub xh yh) (Int.sub_borrow xl yl Int.zero)) (Int.sub xl yl).
Lemma decompose_sub': forall xh xl yh yl, sub (ofwords xh xl) (ofwords yh yl) = ofwords (Int.add (Int.add xh (Int.not yh)) (Int.add_carry xl (Int.not yl) Int.one)) (Int.sub xl yl).