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crypto/aes: use asm for BenchmarkExpand on amd64
This reverses the change to this benchmark made in 9b6bf20
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Change-Id: I79ab88286c3028d3be561957140375bbc413e7ab
Reviewed-on: https://go-review.googlesource.com/22340
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
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@ -380,6 +380,6 @@ func BenchmarkExpand(b *testing.B) {
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c := &aesCipher{make([]uint32, n), make([]uint32, n)}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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expandKeyGo(tt.key, c.enc, c.dec)
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expandKey(tt.key, c.enc, c.dec)
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}
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}
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@ -64,3 +64,20 @@ func (c *aesCipherAsm) Decrypt(dst, src []byte) {
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}
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decryptBlockAsm(len(c.dec)/4-1, &c.dec[0], &dst[0], &src[0])
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}
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// expandKey is used by BenchmarkExpand to ensure that the asm implementation
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// of key expansion is used for the benchmark when it is available.
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func expandKey(key []byte, enc, dec []uint32) {
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if useAsm {
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rounds := 10 // rounds needed for AES128
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switch len(key) {
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case 192 / 8:
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rounds = 12
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case 256 / 8:
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rounds = 14
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}
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expandKeyAsm(rounds, &key[0], &enc[0], &dec[0])
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} else {
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expandKeyGo(key, enc, dec)
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}
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}
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@ -18,3 +18,9 @@ import (
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func newCipher(key []byte) (cipher.Block, error) {
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return newCipherGeneric(key)
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}
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// expandKey is used by BenchmarkExpand and should
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// call an assembly implementation if one is available.
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func expandKey(key []byte, enc, dec []uint32) {
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expandKeyGo(key, enc, dec)
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}
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@ -82,3 +82,9 @@ func (c *aesCipherAsm) Decrypt(dst, src []byte) {
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// The decrypt function code is equal to the function code + 128.
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cryptBlocks(c.function+128, &c.key[0], &dst[0], &src[0], BlockSize)
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}
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// expandKey is used by BenchmarkExpand. cipher message (KM) does not need key
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// expansion so there is no assembly equivalent.
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func expandKey(key []byte, enc, dec []uint32) {
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expandKeyGo(key, enc, dec)
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}
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