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diff --git a/src/LegacyArithmetic/Double/Proofs/ShiftRightDoubleWordImmediate.v b/src/LegacyArithmetic/Double/Proofs/ShiftRightDoubleWordImmediate.v
deleted file mode 100644
index 7210d80d5..000000000
--- a/src/LegacyArithmetic/Double/Proofs/ShiftRightDoubleWordImmediate.v
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@@ -1,42 +0,0 @@
-Require Import Coq.ZArith.ZArith.
-Require Import Crypto.LegacyArithmetic.Interface.
-Require Import Crypto.LegacyArithmetic.Double.Core.
-Require Import Crypto.LegacyArithmetic.Double.Proofs.Decode.
-Require Import Crypto.LegacyArithmetic.Double.Proofs.ShiftLeftRightTactic.
-Require Import Crypto.Util.ZUtil.Hints.Core.
-Require Import Crypto.Util.ZUtil.Definitions.
-
-Local Open Scope Z_scope.
-
-Local Opaque tuple_decoder.
-Local Arguments Z.pow !_ !_.
-Local Arguments Z.mul !_ !_.
-
-Section shrd.
-  Context (n : Z) {W}
-          {ldi : load_immediate W}
-          {shrd : shift_right_doubleword_immediate W}
-          {decode : decoder n W}
-          {isdecode : is_decode decode}
-          {isldi : is_load_immediate ldi}
-          {isshrd : is_shift_right_doubleword_immediate shrd}.
-
-  Local Ltac zutil_arith ::= solve [ auto with nocore omega ].
-
-  Global Instance is_shift_right_doubleword_immediate_double : is_shift_right_doubleword_immediate (shrd_double n).
-  Proof using isdecode isshrd.
-    intros high low count Hcount; hnf in Hcount.
-    unfold shrd_double, shift_right_doubleword_immediate_double; simpl.
-    generalize (decode_range low).
-    generalize (decode_range high).
-    generalize (decode_range (fst low)).
-    generalize (decode_range (snd low)).
-    generalize (decode_range (fst high)).
-    generalize (decode_range (snd high)).
-    assert (forall x, 0 <= Z.pow2_mod x n < 2^n) by auto with zarith.
-    assert (forall n' x, 2^n <= 2^n' -> 0 <= x < 2^n -> 0 <= x < 2^n') by auto with zarith.
-    assert (forall n' x, n <= n' -> 0 <= x < 2^n -> 0 <= x < 2^n') by auto with zarith omega.
-    autorewrite with simpl_tuple_decoder; push_decode.
-    shift_left_right_t.
-  Qed.
-End shrd.