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crypto/sha1: add s390x assembly implementation
Use the compute intermediate message digest (KIMD) instruction when possible. Adds test to check fallback code path in case KIMD is not available. Benchmark changes: Hash8Bytes 3.4x Hash1K 9.3x Hash8K 10.9x Change-Id: Ibcd71a886dfd7b3822042235b4f4eaa7a148036b Reviewed-on: https://go-review.googlesource.com/22350 Run-TryBot: Michael Munday <munday@ca.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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34
src/crypto/sha1/fallback_test.go
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34
src/crypto/sha1/fallback_test.go
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@ -0,0 +1,34 @@
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build s390x
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package sha1
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import (
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"fmt"
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"io"
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"testing"
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)
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// Tests the fallback code path in case the optimized asm
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// implementation cannot be used.
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// See also TestBlockGeneric.
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func TestGenericPath(t *testing.T) {
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if useAsm == false {
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t.Skipf("assembly implementation unavailable")
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}
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useAsm = false
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defer func() { useAsm = true }()
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c := New()
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in := "ΑΒΓΔΕϜΖΗΘΙΚΛΜΝΞΟΠϺϘΡΣΤΥΦΧΨΩ"
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gold := "0f58c2bb130f8182375f325c18342215255387e5"
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if _, err := io.WriteString(c, in); err != nil {
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t.Fatalf("could not write to c: %v", err)
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}
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out := fmt.Sprintf("%x", c.Sum(nil))
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if out != gold {
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t.Fatalf("mismatch: got %s, wanted %s", out, gold)
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}
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}
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@ -91,7 +91,7 @@ func TestBlockSize(t *testing.T) {
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}
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}
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// Tests that blockGeneric (pure Go) and block (in assembly for amd64, 386, arm) match.
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// Tests that blockGeneric (pure Go) and block (in assembly for some architectures) match.
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func TestBlockGeneric(t *testing.T) {
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gen, asm := New().(*digest), New().(*digest)
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buf := make([]byte, BlockSize*20) // arbitrary factor
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@ -2,7 +2,7 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build amd64 amd64p32 arm 386
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// +build amd64 amd64p32 arm 386 s390x
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package sha1
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@ -2,7 +2,7 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !amd64,!amd64p32,!386,!arm
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// +build !amd64,!amd64p32,!386,!arm,!s390x
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package sha1
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12
src/crypto/sha1/sha1block_s390x.go
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12
src/crypto/sha1/sha1block_s390x.go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sha1
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// featureCheck reports whether the CPU supports the
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// SHA1 compute intermediate message digest (KIMD)
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// function code.
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func featureCheck() bool
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var useAsm = featureCheck()
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34
src/crypto/sha1/sha1block_s390x.s
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src/crypto/sha1/sha1block_s390x.s
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// func featureCheck() bool
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TEXT ·featureCheck(SB),NOSPLIT,$16-1
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LA tmp-16(SP), R1
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XOR R0, R0 // query function code is 0
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WORD $0xB93E0006 // KIMD (R6 is ignored)
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MOVBZ tmp-16(SP), R4 // get the first byte
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AND $0x40, R4 // bit 1 (big endian) for SHA1
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CMPBEQ R4, $0, nosha1
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MOVB $1, ret+0(FP)
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RET
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nosha1:
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MOVB $0, ret+0(FP)
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RET
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// func block(dig *digest, p []byte)
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TEXT ·block(SB),NOSPLIT,$0-32
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MOVBZ ·useAsm(SB), R4
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LMG dig+0(FP), R1, R3 // R2 = &p[0], R3 = len(p)
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CMPBNE R4, $1, generic
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MOVBZ $1, R0 // SHA1 function code
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loop:
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WORD $0xB93E0002 // KIMD R2
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BVS loop // continue if interrupted
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done:
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XOR R0, R0 // restore R0
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RET
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generic:
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BR ·blockGeneric(SB)
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