distribution/vendor/github.com/stevvooe/resumable/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 featureCheck() bool
TEXT ·featureCheck(SB),NOSPLIT,$16-1
LA tmp-16(SP), R1
XOR R0, R0 // query function code is 0
WORD $0xB93E0006 // KIMD (R6 is ignored)
MOVBZ tmp-16(SP), R4 // get the first byte
AND $0x10, R4 // bit 3 (big endian) for SHA512
CMPBEQ R4, $0, nosha512
MOVB $1, ret+0(FP)
RET
nosha512:
MOVB $0, ret+0(FP)
RET
// func block(dig *digest, p []byte)
TEXT ·block(SB),NOSPLIT,$0-32
MOVBZ ·useAsm(SB), R4
LMG dig+0(FP), R1, R3 // R2 = &p[0], R3 = len(p)
CMPBNE R4, $1, generic
MOVBZ $3, R0 // SHA512 function code
loop:
WORD $0xB93E0002 // KIMD R2
BVS loop // continue if interrupted
done:
XOR R0, R0 // restore R0
RET
generic:
BR ·blockGeneric(SB)