git: 69d8dc20be6c - main - Use arm64 sha256 intrinsics in libmd
Andrew Turner
andrew at FreeBSD.org
Wed Aug 11 10:21:51 UTC 2021
The branch main has been updated by andrew:
URL: https://cgit.FreeBSD.org/src/commit/?id=69d8dc20be6ca10cf87c98223121c4121aff42cc
commit 69d8dc20be6ca10cf87c98223121c4121aff42cc
Author: Andrew Turner <andrew at FreeBSD.org>
AuthorDate: 2021-07-23 09:14:03 +0000
Commit: Andrew Turner <andrew at FreeBSD.org>
CommitDate: 2021-08-11 10:20:48 +0000
Use arm64 sha256 intrinsics in libmd
Summary:
When running on a CPU that supports the arm64 sha256 intrinsics use them
to improve perfromance of sha256 calculations.
With this changethe following improvement has been seen on an Apple M1
with FreeBS running under Parallels, with similar results on a
Neoverse-N1 r3p1.
x sha256.orig
+ sha256.arm64
+--------------------------------------------------------------------+
|++ x x|
|+++ xxx|
||A |A||
+--------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 5 3.41 3.5 3.46 3.458 0.042661458
+ 5 0.47 0.54 0.5 0.504 0.027018512
Difference at 95.0% confidence
-2.954 +/- 0.0520768
-85.4251% +/- 0.826831%
(Student's t, pooled s = 0.0357071)
Reviewed by: cem
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31284
---
lib/libmd/Makefile | 5 +++
sys/crypto/sha2/sha256c.c | 35 ++++++++++++++-
sys/crypto/sha2/sha256c_arm64.c | 97 +++++++++++++++++++++++++++++++++++++++++
sys/crypto/sha2/sha256c_impl.h | 37 ++++++++++++++++
4 files changed, 173 insertions(+), 1 deletion(-)
diff --git a/lib/libmd/Makefile b/lib/libmd/Makefile
index f90101112ba9..480796ae5029 100644
--- a/lib/libmd/Makefile
+++ b/lib/libmd/Makefile
@@ -129,6 +129,11 @@ skein_block.o skein_block.pico: Makefile
.if exists(${MACHINE_ARCH}/sha.S) || exists(${MACHINE_ARCH}/rmd160.S) || exists(${MACHINE_ARCH}/skein_block_asm.S)
ACFLAGS+= -DELF -Wa,--noexecstack
.endif
+.if ${MACHINE_CPUARCH} == "aarch64"
+SRCS+= sha256c_arm64.c
+CFLAGS+= -DARM64_SHA2
+CFLAGS.sha256c_arm64.c+= -march=armv8-a+crypto
+.endif
.endif # ${USE_ASM_SOURCES} != 0
md4hl.c: mdXhl.c
diff --git a/sys/crypto/sha2/sha256c.c b/sys/crypto/sha2/sha256c.c
index 135fb68ccc65..63805c97a4bb 100644
--- a/sys/crypto/sha2/sha256c.c
+++ b/sys/crypto/sha2/sha256c.c
@@ -38,6 +38,12 @@ __FBSDID("$FreeBSD$");
#include "sha224.h"
#include "sha256.h"
+#include "sha256c_impl.h"
+
+#if defined(ARM64_SHA2)
+#include <sys/auxv.h>
+#include <machine/ifunc.h>
+#endif
#if BYTE_ORDER == BIG_ENDIAN
@@ -132,7 +138,7 @@ static const uint32_t K[64] = {
* the 512-bit input block to produce a new state.
*/
static void
-SHA256_Transform(uint32_t * state, const unsigned char block[64])
+SHA256_Transform_c(uint32_t * state, const unsigned char block[64])
{
uint32_t W[64];
uint32_t S[8];
@@ -188,6 +194,33 @@ SHA256_Transform(uint32_t * state, const unsigned char block[64])
state[i] += S[i];
}
+#if defined(ARM64_SHA2)
+static void
+SHA256_Transform_arm64(uint32_t * state, const unsigned char block[64])
+{
+ SHA256_Transform_arm64_impl(state, block, K);
+}
+
+DEFINE_UIFUNC(static, void, SHA256_Transform,
+ (uint32_t * state, const unsigned char block[64]))
+{
+ u_long hwcap;
+
+ if (elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap)) == 0) {
+ if ((hwcap & HWCAP_SHA2) != 0)
+ return (SHA256_Transform_arm64);
+ }
+
+ return (SHA256_Transform_c);
+}
+#else
+static void
+SHA256_Transform(uint32_t * state, const unsigned char block[64])
+{
+ SHA256_Transform_c(state, block);
+}
+#endif
+
static unsigned char PAD[64] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
diff --git a/sys/crypto/sha2/sha256c_arm64.c b/sys/crypto/sha2/sha256c_arm64.c
new file mode 100644
index 000000000000..8c0153c2b603
--- /dev/null
+++ b/sys/crypto/sha2/sha256c_arm64.c
@@ -0,0 +1,97 @@
+/*-
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * This software was developed by Andrew Turner under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <arm_neon.h>
+
+#include "sha256c_impl.h"
+
+void __hidden
+SHA256_Transform_arm64_impl(uint32_t * state, const unsigned char block[64],
+ const uint32_t K[64])
+{
+ uint32x4_t W[4];
+ uint32x4_t S[2];
+ uint32x4_t S_start[2];
+ uint32x4_t K_tmp, S_tmp;
+ int i;
+
+#define A64_LOAD_W(x) \
+ W[x] = vld1q_u32((const uint32_t *)(&block[(x) * 16])); \
+ W[x] = vreinterpretq_u32_u8(vrev32q_u8(vreinterpretq_u8_u32(W[x])))
+
+ /* 1. Prepare the first part of the message schedule W. */
+ A64_LOAD_W(0);
+ A64_LOAD_W(1);
+ A64_LOAD_W(2);
+ A64_LOAD_W(3);
+
+ /* 2. Initialize working variables. */
+ S[0] = vld1q_u32(&state[0]);
+ S[1] = vld1q_u32(&state[4]);
+
+ S_start[0] = S[0];
+ S_start[1] = S[1];
+
+ /* 3. Mix. */
+ for (i = 0; i < 64; i += 16) {
+#define A64_RNDr(i, ii) \
+ K_tmp = vaddq_u32(W[i], vld1q_u32(&K[ii + i * 4])); \
+ S_tmp = vsha256hq_u32(S[0], S[1], K_tmp); \
+ S[1] = vsha256h2q_u32(S[1], S[0], K_tmp); \
+ S[0] = S_tmp
+
+ A64_RNDr(0, i);
+ A64_RNDr(1, i);
+ A64_RNDr(2, i);
+ A64_RNDr(3, i);
+
+ if (i == 48)
+ break;
+
+#define A64_MSCH(x) \
+ W[x] = vsha256su0q_u32(W[x], W[(x + 1) % 4]); \
+ W[x] = vsha256su1q_u32(W[x], W[(x + 2) % 4], W[(x + 3) % 4])
+
+ A64_MSCH(0);
+ A64_MSCH(1);
+ A64_MSCH(2);
+ A64_MSCH(3);
+ }
+
+ /* 4. Mix local working variables into global state */
+ S[0] = vaddq_u32(S[0], S_start[0]);
+ S[1] = vaddq_u32(S[1], S_start[1]);
+
+ vst1q_u32(&state[0], S[0]);
+ vst1q_u32(&state[4], S[1]);
+}
diff --git a/sys/crypto/sha2/sha256c_impl.h b/sys/crypto/sha2/sha256c_impl.h
new file mode 100644
index 000000000000..ed96e6706699
--- /dev/null
+++ b/sys/crypto/sha2/sha256c_impl.h
@@ -0,0 +1,37 @@
+/*-
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * This software was developed by Andrew Turner under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SHA256_IMPL_H_
+#define _SHA256_IMPL_H_
+
+#if defined(ARM64_SHA2)
+void SHA256_Transform_arm64_impl(uint32_t * state,
+ const unsigned char block[64], const uint32_t K[64]);
+#endif
+
+#endif /* !_SHA256_IMPL_H_ */
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