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diff --git a/src/crypto/sha512/sha512block_s390x.s b/src/crypto/sha512/sha512block_s390x.s
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+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// func block(dig *digest, p []byte)
+TEXT ·block(SB), NOSPLIT|NOFRAME, $0-32
+ MOVBZ ·useAsm(SB), R4
+ LMG dig+0(FP), R1, R3 // R2 = &p[0], R3 = len(p)
+ MOVBZ $3, R0 // SHA-512 function code
+ CMPBEQ R4, $0, generic
+
+loop:
+ WORD $0xB93E0002 // KIMD R2
+ BVS loop // continue if interrupted
+ RET
+
+generic:
+ BR ·blockGeneric(SB)