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Fast CRC implementations ported from Intel's efforts
Provides fast CRC32C with PCLMULQDQ instructions in Golang The white papers on CRC32C calculations with PCLMULQDQ instruction can be downloaded from: http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-paper.pdf
This commit is contained in:
Harshavardhana
parent
d31050803b
commit
fb34c5290c
6
Makefile
6
Makefile
@ -15,13 +15,17 @@ build-erasure:
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build-signify:
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@$(MAKE) $(MAKE_OPTIONS) -C pkgs/signify
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build-crc32c:
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/crc32c/cpu
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/crc32c
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build-split: build-strbyteconv
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/split
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build-strbyteconv:
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/strbyteconv
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cover: build-erasure build-signify build-split
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cover: build-erasure build-signify build-split build-crc32c
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/storage
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@godep go test -race -coverprofile=cover.out github.com/minio-io/minio/pkgs/gateway
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18
pkgs/crc32c/cpu/cpu.go
Normal file
18
pkgs/crc32c/cpu/cpu.go
Normal file
@ -0,0 +1,18 @@
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// +build linux,amd64
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package cpu
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// #include "cpu.h"
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import "C"
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func HasSSE41() int {
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return int(C.has_sse41())
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}
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func HasAVX() int {
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return int(C.has_avx())
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}
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func HasAVX2() int {
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return int(C.has_avx2())
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}
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24
pkgs/crc32c/cpu/cpu.h
Normal file
24
pkgs/crc32c/cpu/cpu.h
Normal file
@ -0,0 +1,24 @@
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/*
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* Mini Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CPU_H__
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#define __CPU_H__
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int has_sse41 (void);
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int has_avx (void);
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int has_avx2 (void);
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#endif /* __CPU_H__ */
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139
pkgs/crc32c/cpu/cpu_amd64.S
Normal file
139
pkgs/crc32c/cpu/cpu_amd64.S
Normal file
@ -0,0 +1,139 @@
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/*
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* Mini Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License") ;
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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.file "cpufeatures.c"
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.text
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.type cpuid, @function
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cpuid:
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.LFB2:
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.cfi_startproc
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset 6, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register 6
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pushq %rbx
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.cfi_offset 3, -24
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movq %rdi, -16(%rbp)
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movl %esi, -20(%rbp)
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movq -16(%rbp), %rax
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leaq 4(%rax), %r10
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movq -16(%rbp), %rax
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leaq 8(%rax), %r9
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movq -16(%rbp), %rax
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leaq 12(%rax), %r8
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movl -20(%rbp), %eax
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movl $0, %edx
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movl %edx, %ecx
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#APP
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# 21 "cpufeatures.c" 1
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cpuid
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# 0 "" 2
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#NO_APP
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movl %ebx, %esi
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movl %eax, %edi
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movq -16(%rbp), %rax
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movl %edi, (%rax)
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movl %esi, (%r10)
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movl %ecx, (%r9)
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movl %edx, (%r8)
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popq %rbx
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popq %rbp
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.cfi_def_cfa 7, 8
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ret
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.cfi_endproc
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.LFE2:
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.size cpuid, .-cpuid
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.globl has_sse41
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.type has_sse41, @function
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has_sse41:
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.LFB3:
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.cfi_startproc
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset 6, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register 6
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subq $16, %rsp
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leaq -16(%rbp), %rax
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movl $1, %esi
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movq %rax, %rdi
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call cpuid
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movl -8(%rbp), %eax
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andl $524288, %eax
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testl %eax, %eax
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setne %al
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movzbl %al, %eax
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leave
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.cfi_def_cfa 7, 8
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ret
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.cfi_endproc
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.LFE3:
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.size has_sse41, .-has_sse41
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.globl has_avx
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.type has_avx, @function
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has_avx:
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.LFB4:
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.cfi_startproc
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset 6, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register 6
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subq $16, %rsp
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leaq -16(%rbp), %rax
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movl $1, %esi
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movq %rax, %rdi
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call cpuid
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movl -8(%rbp), %eax
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andl $268435456, %eax
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testl %eax, %eax
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setne %al
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movzbl %al, %eax
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leave
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.cfi_def_cfa 7, 8
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ret
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.cfi_endproc
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.LFE4:
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.size has_avx, .-has_avx
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.globl has_avx2
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.type has_avx2, @function
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has_avx2:
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.LFB5:
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.cfi_startproc
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset 6, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register 6
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subq $16, %rsp
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leaq -16(%rbp), %rax
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movl $7, %esi
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movq %rax, %rdi
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call cpuid
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movl -12(%rbp), %eax
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andl $32, %eax
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testl %eax, %eax
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setne %al
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movzbl %al, %eax
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leave
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.cfi_def_cfa 7, 8
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ret
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.cfi_endproc
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.LFE5:
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.size has_avx2, .-has_avx2
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.ident "GCC: (Ubuntu 4.8.2-19ubuntu1) 4.8.2"
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.section .note.GNU-stack,"",@progbits
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27
pkgs/crc32c/cpu/cpu_test.go
Normal file
27
pkgs/crc32c/cpu/cpu_test.go
Normal file
@ -0,0 +1,27 @@
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package cpu
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import (
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. "gopkg.in/check.v1"
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"testing"
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)
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func Test(t *testing.T) { TestingT(t) }
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type MySuite struct{}
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var _ = Suite(&MySuite{})
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func (s *MySuite) TestHasSSE41(c *C) {
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var bool = HasSSE41()
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c.Check(bool, Equals, 1)
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}
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func (s *MySuite) TestHasAVX(c *C) {
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var bool = HasAVX()
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c.Check(bool, Equals, 1)
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}
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func (s *MySuite) TestHasAVX2(c *C) {
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var bool = HasAVX2()
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c.Check(bool, Equals, 0)
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}
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23
pkgs/crc32c/crc32c.go
Normal file
23
pkgs/crc32c/crc32c.go
Normal file
@ -0,0 +1,23 @@
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// +build linux,amd64
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package crc32c
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// #include "crc32c.h"
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import "C"
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import (
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"errors"
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"unsafe"
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)
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func Crc32c(buffer []byte) (uint32, error) {
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var length = len(buffer)
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if length == 0 {
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return 0, errors.New("Invalid input")
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}
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var cbuf *C.uint8_t
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cbuf = (*C.uint8_t)(unsafe.Pointer(&buffer[0]))
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crc := C.crc32c_pcl(cbuf, C.int32_t(length), C.uint32_t(0))
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return uint32(crc), nil
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}
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3
pkgs/crc32c/crc32c.h
Normal file
3
pkgs/crc32c/crc32c.h
Normal file
@ -0,0 +1,3 @@
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#include <stdint.h>
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uint32_t crc32c_pcl(uint8_t *buf, int32_t len, uint32_t prev_crc);
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732
pkgs/crc32c/crc32c_amd64.S
Normal file
732
pkgs/crc32c/crc32c_amd64.S
Normal file
@ -0,0 +1,732 @@
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/*
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* Implement fast CRC32C with PCLMULQDQ instructions. (x86_64)
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*
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* The white papers on CRC32C calculations with PCLMULQDQ instruction can be
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* downloaded from:
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* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
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* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-paper.pdf
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* Authors:
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* Wajdi Feghali <wajdi.k.feghali@intel.com>
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* James Guilford <james.guilford@intel.com>
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* David Cote <david.m.cote@intel.com>
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* Tim Chen <tim.c.chen@linux.intel.com>
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
|
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
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* SOFTWARE.
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*/
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#ifndef ASM_NL
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#define ASM_NL ;
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#endif
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#ifndef __ALIGN
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#define __ALIGN .align 4,0x90
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#endif
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#define ALIGN __ALIGN
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#ifndef ENTRY
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#define ENTRY(name) \
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.globl name ASM_NL \
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ALIGN ASM_NL \
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name:
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#endif
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#ifndef END
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#define END(name) \
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.size name, .-name
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#endif
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#ifndef ENDPROC
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#define ENDPROC(name) \
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.type name, @function ASM_NL \
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END(name)
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#endif
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#define NUM_INVALID 100
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#define TYPE_R32 0
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#define TYPE_R64 1
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#define TYPE_XMM 2
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#define TYPE_INVALID 100
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.macro R32_NUM opd r32
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\opd = NUM_INVALID
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.ifc \r32,%eax
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\opd = 0
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.endif
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.ifc \r32,%ecx
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\opd = 1
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.endif
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.ifc \r32,%edx
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\opd = 2
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.endif
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.ifc \r32,%ebx
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\opd = 3
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.endif
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.ifc \r32,%esp
|
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\opd = 4
|
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.endif
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.ifc \r32,%ebp
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\opd = 5
|
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.endif
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.ifc \r32,%esi
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\opd = 6
|
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.endif
|
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.ifc \r32,%edi
|
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\opd = 7
|
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.endif
|
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#ifdef X86_64
|
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.ifc \r32,%r8d
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\opd = 8
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.endif
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.ifc \r32,%r9d
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\opd = 9
|
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.endif
|
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.ifc \r32,%r10d
|
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\opd = 10
|
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.endif
|
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.ifc \r32,%r11d
|
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\opd = 11
|
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.endif
|
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.ifc \r32,%r12d
|
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\opd = 12
|
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.endif
|
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.ifc \r32,%r13d
|
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\opd = 13
|
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.endif
|
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.ifc \r32,%r14d
|
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\opd = 14
|
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.endif
|
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.ifc \r32,%r15d
|
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\opd = 15
|
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.endif
|
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#endif
|
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.endm
|
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|
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.macro R64_NUM opd r64
|
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\opd = NUM_INVALID
|
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#ifdef X86_64
|
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.ifc \r64,%rax
|
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\opd = 0
|
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.endif
|
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.ifc \r64,%rcx
|
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\opd = 1
|
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.endif
|
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.ifc \r64,%rdx
|
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\opd = 2
|
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.endif
|
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.ifc \r64,%rbx
|
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\opd = 3
|
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.endif
|
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.ifc \r64,%rsp
|
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\opd = 4
|
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.endif
|
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.ifc \r64,%rbp
|
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\opd = 5
|
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.endif
|
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.ifc \r64,%rsi
|
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\opd = 6
|
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.endif
|
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.ifc \r64,%rdi
|
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\opd = 7
|
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.endif
|
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.ifc \r64,%r8
|
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\opd = 8
|
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.endif
|
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.ifc \r64,%r9
|
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\opd = 9
|
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.endif
|
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.ifc \r64,%r10
|
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\opd = 10
|
||||
.endif
|
||||
.ifc \r64,%r11
|
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\opd = 11
|
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.endif
|
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.ifc \r64,%r12
|
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\opd = 12
|
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.endif
|
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.ifc \r64,%r13
|
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\opd = 13
|
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.endif
|
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.ifc \r64,%r14
|
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\opd = 14
|
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.endif
|
||||
.ifc \r64,%r15
|
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\opd = 15
|
||||
.endif
|
||||
#endif
|
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.endm
|
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|
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.macro XMM_NUM opd xmm
|
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\opd = NUM_INVALID
|
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.ifc \xmm,%xmm0
|
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\opd = 0
|
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.endif
|
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.ifc \xmm,%xmm1
|
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\opd = 1
|
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.endif
|
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.ifc \xmm,%xmm2
|
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\opd = 2
|
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.endif
|
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.ifc \xmm,%xmm3
|
||||
\opd = 3
|
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.endif
|
||||
.ifc \xmm,%xmm4
|
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\opd = 4
|
||||
.endif
|
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.ifc \xmm,%xmm5
|
||||
\opd = 5
|
||||
.endif
|
||||
.ifc \xmm,%xmm6
|
||||
\opd = 6
|
||||
.endif
|
||||
.ifc \xmm,%xmm7
|
||||
\opd = 7
|
||||
.endif
|
||||
.ifc \xmm,%xmm8
|
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\opd = 8
|
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.endif
|
||||
.ifc \xmm,%xmm9
|
||||
\opd = 9
|
||||
.endif
|
||||
.ifc \xmm,%xmm10
|
||||
\opd = 10
|
||||
.endif
|
||||
.ifc \xmm,%xmm11
|
||||
\opd = 11
|
||||
.endif
|
||||
.ifc \xmm,%xmm12
|
||||
\opd = 12
|
||||
.endif
|
||||
.ifc \xmm,%xmm13
|
||||
\opd = 13
|
||||
.endif
|
||||
.ifc \xmm,%xmm14
|
||||
\opd = 14
|
||||
.endif
|
||||
.ifc \xmm,%xmm15
|
||||
\opd = 15
|
||||
.endif
|
||||
.endm
|
||||
|
||||
.macro TYPE type reg
|
||||
R32_NUM reg_type_r32 \reg
|
||||
R64_NUM reg_type_r64 \reg
|
||||
XMM_NUM reg_type_xmm \reg
|
||||
.if reg_type_r64 <> NUM_INVALID
|
||||
\type = TYPE_R64
|
||||
.elseif reg_type_r32 <> NUM_INVALID
|
||||
\type = TYPE_R32
|
||||
.elseif reg_type_xmm <> NUM_INVALID
|
||||
\type = TYPE_XMM
|
||||
.else
|
||||
\type = TYPE_INVALID
|
||||
.endif
|
||||
.endm
|
||||
|
||||
.macro PFX_OPD_SIZE
|
||||
.byte 0x66
|
||||
.endm
|
||||
|
||||
.macro PFX_REX opd1 opd2 W=0
|
||||
.if ((\opd1 | \opd2) & 8) || \W
|
||||
.byte 0x40 | ((\opd1 & 8) >> 3) | ((\opd2 & 8) >> 1) | (\W << 3)
|
||||
.endif
|
||||
.endm
|
||||
|
||||
.macro MODRM mod opd1 opd2
|
||||
.byte \mod | (\opd1 & 7) | ((\opd2 & 7) << 3)
|
||||
.endm
|
||||
|
||||
.macro PSHUFB_XMM xmm1 xmm2
|
||||
XMM_NUM pshufb_opd1 \xmm1
|
||||
XMM_NUM pshufb_opd2 \xmm2
|
||||
PFX_OPD_SIZE
|
||||
PFX_REX pshufb_opd1 pshufb_opd2
|
||||
.byte 0x0f, 0x38, 0x00
|
||||
MODRM 0xc0 pshufb_opd1 pshufb_opd2
|
||||
.endm
|
||||
|
||||
.macro PCLMULQDQ imm8 xmm1 xmm2
|
||||
XMM_NUM clmul_opd1 \xmm1
|
||||
XMM_NUM clmul_opd2 \xmm2
|
||||
PFX_OPD_SIZE
|
||||
PFX_REX clmul_opd1 clmul_opd2
|
||||
.byte 0x0f, 0x3a, 0x44
|
||||
MODRM 0xc0 clmul_opd1 clmul_opd2
|
||||
.byte \imm8
|
||||
.endm
|
||||
|
||||
.macro PEXTRD imm8 xmm gpr
|
||||
R32_NUM extrd_opd1 \gpr
|
||||
XMM_NUM extrd_opd2 \xmm
|
||||
PFX_OPD_SIZE
|
||||
PFX_REX extrd_opd1 extrd_opd2
|
||||
.byte 0x0f, 0x3a, 0x16
|
||||
MODRM 0xc0 extrd_opd1 extrd_opd2
|
||||
.byte \imm8
|
||||
.endm
|
||||
|
||||
.macro MOVQ_R64_XMM opd1 opd2
|
||||
TYPE movq_r64_xmm_opd1_type \opd1
|
||||
.if movq_r64_xmm_opd1_type == TYPE_XMM
|
||||
XMM_NUM movq_r64_xmm_opd1 \opd1
|
||||
R64_NUM movq_r64_xmm_opd2 \opd2
|
||||
.else
|
||||
R64_NUM movq_r64_xmm_opd1 \opd1
|
||||
XMM_NUM movq_r64_xmm_opd2 \opd2
|
||||
.endif
|
||||
PFX_OPD_SIZE
|
||||
PFX_REX movq_r64_xmm_opd1 movq_r64_xmm_opd2 1
|
||||
.if movq_r64_xmm_opd1_type == TYPE_XMM
|
||||
.byte 0x0f, 0x7e
|
||||
.else
|
||||
.byte 0x0f, 0x6e
|
||||
.endif
|
||||
MODRM 0xc0 movq_r64_xmm_opd1 movq_r64_xmm_opd2
|
||||
.endm
|
||||
|
||||
## ISCSI CRC 32 Implementation with crc32 and pclmulqdq Instruction
|
||||
|
||||
.macro LABEL prefix n
|
||||
\prefix\n\():
|
||||
.endm
|
||||
|
||||
.macro JMPTBL_ENTRY i
|
||||
.word crc_\i - crc_array
|
||||
.endm
|
||||
|
||||
.macro JNC_LESS_THAN j
|
||||
jnc less_than_\j
|
||||
.endm
|
||||
|
||||
# Define threshold where buffers are considered "small" and routed to more
|
||||
# efficient "by-1" code. This "by-1" code only handles up to 255 bytes, so
|
||||
# SMALL_SIZE can be no larger than 255.
|
||||
|
||||
#define SMALL_SIZE 200
|
||||
|
||||
.if (SMALL_SIZE > 255)
|
||||
.error "SMALL_ SIZE must be < 256"
|
||||
.endif
|
||||
|
||||
# unsigned int crc32c_pcl(u8 *buffer, int len, unsigned int crc_init);
|
||||
|
||||
.text
|
||||
ENTRY(crc32c_pcl)
|
||||
#define bufp %rdi
|
||||
#define bufp_dw %edi
|
||||
#define bufp_w %di
|
||||
#define bufp_b %dil
|
||||
#define bufptmp %rcx
|
||||
#define block_0 %rcx
|
||||
#define block_1 %rdx
|
||||
#define block_2 %r11
|
||||
#define len %rsi
|
||||
#define len_dw %esi
|
||||
#define len_w %si
|
||||
#define len_b %sil
|
||||
#define crc_init_arg %rdx
|
||||
#define tmp %rbx
|
||||
#define crc_init %r8
|
||||
#define crc_init_dw %r8d
|
||||
#define crc1 %r9
|
||||
#define crc2 %r10
|
||||
|
||||
pushq %rbx
|
||||
pushq %rdi
|
||||
pushq %rsi
|
||||
|
||||
## Move crc_init for Linux to a different
|
||||
mov crc_init_arg, crc_init
|
||||
|
||||
################################################################
|
||||
## 1) ALIGN:
|
||||
################################################################
|
||||
|
||||
mov bufp, bufptmp # rdi = *buf
|
||||
neg bufp
|
||||
and $7, bufp # calculate the unalignment amount of
|
||||
# the address
|
||||
je proc_block # Skip if aligned
|
||||
|
||||
## If len is less than 8 and we're unaligned, we need to jump
|
||||
## to special code to avoid reading beyond the end of the buffer
|
||||
cmp $8, len
|
||||
jae do_align
|
||||
# less_than_8 expects length in upper 3 bits of len_dw
|
||||
# less_than_8_post_shl1 expects length = carryflag * 8 + len_dw[31:30]
|
||||
shl $32-3+1, len_dw
|
||||
jmp less_than_8_post_shl1
|
||||
|
||||
do_align:
|
||||
#### Calculate CRC of unaligned bytes of the buffer (if any)
|
||||
movq (bufptmp), tmp # load a quadward from the buffer
|
||||
add bufp, bufptmp # align buffer pointer for quadword
|
||||
# processing
|
||||
sub bufp, len # update buffer length
|
||||
align_loop:
|
||||
crc32b %bl, crc_init_dw # compute crc32 of 1-byte
|
||||
shr $8, tmp # get next byte
|
||||
dec bufp
|
||||
jne align_loop
|
||||
|
||||
proc_block:
|
||||
|
||||
################################################################
|
||||
## 2) PROCESS BLOCKS:
|
||||
################################################################
|
||||
|
||||
## compute num of bytes to be processed
|
||||
movq len, tmp # save num bytes in tmp
|
||||
|
||||
cmpq $128*24, len
|
||||
jae full_block
|
||||
|
||||
continue_block:
|
||||
cmpq $SMALL_SIZE, len
|
||||
jb small
|
||||
|
||||
## len < 128*24
|
||||
movq $2731, %rax # 2731 = ceil(2^16 / 24)
|
||||
mul len_dw
|
||||
shrq $16, %rax
|
||||
|
||||
## eax contains floor(bytes / 24) = num 24-byte chunks to do
|
||||
|
||||
## process rax 24-byte chunks (128 >= rax >= 0)
|
||||
|
||||
## compute end address of each block
|
||||
## block 0 (base addr + RAX * 8)
|
||||
## block 1 (base addr + RAX * 16)
|
||||
## block 2 (base addr + RAX * 24)
|
||||
lea (bufptmp, %rax, 8), block_0
|
||||
lea (block_0, %rax, 8), block_1
|
||||
lea (block_1, %rax, 8), block_2
|
||||
|
||||
xor crc1, crc1
|
||||
xor crc2, crc2
|
||||
|
||||
## branch into array
|
||||
lea jump_table(%rip), bufp
|
||||
movzxw (bufp, %rax, 2), len
|
||||
offset=crc_array-jump_table
|
||||
lea offset(bufp, len, 1), bufp
|
||||
jmp *bufp
|
||||
|
||||
################################################################
|
||||
## 2a) PROCESS FULL BLOCKS:
|
||||
################################################################
|
||||
full_block:
|
||||
movq $128,%rax
|
||||
lea 128*8*2(block_0), block_1
|
||||
lea 128*8*3(block_0), block_2
|
||||
add $128*8*1, block_0
|
||||
|
||||
xor crc1,crc1
|
||||
xor crc2,crc2
|
||||
|
||||
# Fall thruogh into top of crc array (crc_128)
|
||||
|
||||
################################################################
|
||||
## 3) CRC Array:
|
||||
################################################################
|
||||
|
||||
crc_array:
|
||||
i=128
|
||||
.rept 128-1
|
||||
.altmacro
|
||||
LABEL crc_ %i
|
||||
.noaltmacro
|
||||
crc32q -i*8(block_0), crc_init
|
||||
crc32q -i*8(block_1), crc1
|
||||
crc32q -i*8(block_2), crc2
|
||||
i=(i-1)
|
||||
.endr
|
||||
|
||||
.altmacro
|
||||
LABEL crc_ %i
|
||||
.noaltmacro
|
||||
crc32q -i*8(block_0), crc_init
|
||||
crc32q -i*8(block_1), crc1
|
||||
# SKIP crc32 -i*8(block_2), crc2 ; Don't do this one yet
|
||||
|
||||
mov block_2, block_0
|
||||
|
||||
################################################################
|
||||
## 4) Combine three results:
|
||||
################################################################
|
||||
|
||||
lea (K_table-8)(%rip), bufp # first entry is for idx 1
|
||||
shlq $3, %rax # rax *= 8
|
||||
pmovzxdq (bufp,%rax), %xmm0 # 2 consts: K1:K2
|
||||
leal (%eax,%eax,2), %eax # rax *= 3 (total *24)
|
||||
subq %rax, tmp # tmp -= rax*24
|
||||
|
||||
movq crc_init, %xmm1 # CRC for block 1
|
||||
PCLMULQDQ 0x00, %xmm0, %xmm1 # Multiply by K2
|
||||
|
||||
movq crc1, %xmm2 # CRC for block 2
|
||||
PCLMULQDQ 0x10, %xmm0, %xmm2 # Multiply by K1
|
||||
|
||||
pxor %xmm2,%xmm1
|
||||
movq %xmm1, %rax
|
||||
xor -i*8(block_2), %rax
|
||||
mov crc2, crc_init
|
||||
crc32 %rax, crc_init
|
||||
|
||||
################################################################
|
||||
## 5) Check for end:
|
||||
################################################################
|
||||
|
||||
LABEL crc_ 0
|
||||
mov tmp, len
|
||||
cmp $128*24, tmp
|
||||
jae full_block
|
||||
cmp $24, tmp
|
||||
jae continue_block
|
||||
|
||||
less_than_24:
|
||||
shl $32-4, len_dw # less_than_16 expects length
|
||||
# in upper 4 bits of len_dw
|
||||
jnc less_than_16
|
||||
crc32q (bufptmp), crc_init
|
||||
crc32q 8(bufptmp), crc_init
|
||||
jz do_return
|
||||
add $16, bufptmp
|
||||
# len is less than 8 if we got here
|
||||
# less_than_8 expects length in upper 3 bits of len_dw
|
||||
# less_than_8_post_shl1 expects length = carryflag * 8 + len_dw[31:30]
|
||||
shl $2, len_dw
|
||||
jmp less_than_8_post_shl1
|
||||
|
||||
#######################################################################
|
||||
## 6) LESS THAN 256-bytes REMAIN AT THIS POINT (8-bits of len are full)
|
||||
#######################################################################
|
||||
small:
|
||||
shl $32-8, len_dw # Prepare len_dw for less_than_256
|
||||
j=256
|
||||
.rept 5 # j = {256, 128, 64, 32, 16}
|
||||
.altmacro
|
||||
LABEL less_than_ %j # less_than_j: Length should be in
|
||||
# upper lg(j) bits of len_dw
|
||||
j=(j/2)
|
||||
shl $1, len_dw # Get next MSB
|
||||
JNC_LESS_THAN %j
|
||||
.noaltmacro
|
||||
i=0
|
||||
.rept (j/8)
|
||||
crc32q i(bufptmp), crc_init # Compute crc32 of 8-byte data
|
||||
i=i+8
|
||||
.endr
|
||||
jz do_return # Return if remaining length is zero
|
||||
add $j, bufptmp # Advance buf
|
||||
.endr
|
||||
|
||||
less_than_8: # Length should be stored in
|
||||
# upper 3 bits of len_dw
|
||||
shl $1, len_dw
|
||||
less_than_8_post_shl1:
|
||||
jnc less_than_4
|
||||
crc32l (bufptmp), crc_init_dw # CRC of 4 bytes
|
||||
jz do_return # return if remaining data is zero
|
||||
add $4, bufptmp
|
||||
less_than_4: # Length should be stored in
|
||||
# upper 2 bits of len_dw
|
||||
shl $1, len_dw
|
||||
jnc less_than_2
|
||||
crc32w (bufptmp), crc_init_dw # CRC of 2 bytes
|
||||
jz do_return # return if remaining data is zero
|
||||
add $2, bufptmp
|
||||
less_than_2: # Length should be stored in the MSB
|
||||
# of len_dw
|
||||
shl $1, len_dw
|
||||
jnc less_than_1
|
||||
crc32b (bufptmp), crc_init_dw # CRC of 1 byte
|
||||
less_than_1: # Length should be zero
|
||||
do_return:
|
||||
movq crc_init, %rax
|
||||
popq %rsi
|
||||
popq %rdi
|
||||
popq %rbx
|
||||
ret
|
||||
|
||||
################################################################
|
||||
## jump table Table is 129 entries x 2 bytes each
|
||||
################################################################
|
||||
.align 4
|
||||
jump_table:
|
||||
i=0
|
||||
.rept 129
|
||||
.altmacro
|
||||
JMPTBL_ENTRY %i
|
||||
.noaltmacro
|
||||
i=i+1
|
||||
.endr
|
||||
|
||||
ENDPROC(crc32c_pcl)
|
||||
|
||||
################################################################
|
||||
## PCLMULQDQ tables
|
||||
## Table is 128 entries x 2 words (8 bytes) each
|
||||
################################################################
|
||||
.section .rotata, "a", %progbits
|
||||
.align 8
|
||||
K_table:
|
||||
.long 0x493c7d27, 0x00000001
|
||||
.long 0xba4fc28e, 0x493c7d27
|
||||
.long 0xddc0152b, 0xf20c0dfe
|
||||
.long 0x9e4addf8, 0xba4fc28e
|
||||
.long 0x39d3b296, 0x3da6d0cb
|
||||
.long 0x0715ce53, 0xddc0152b
|
||||
.long 0x47db8317, 0x1c291d04
|
||||
.long 0x0d3b6092, 0x9e4addf8
|
||||
.long 0xc96cfdc0, 0x740eef02
|
||||
.long 0x878a92a7, 0x39d3b296
|
||||
.long 0xdaece73e, 0x083a6eec
|
||||
.long 0xab7aff2a, 0x0715ce53
|
||||
.long 0x2162d385, 0xc49f4f67
|
||||
.long 0x83348832, 0x47db8317
|
||||
.long 0x299847d5, 0x2ad91c30
|
||||
.long 0xb9e02b86, 0x0d3b6092
|
||||
.long 0x18b33a4e, 0x6992cea2
|
||||
.long 0xb6dd949b, 0xc96cfdc0
|
||||
.long 0x78d9ccb7, 0x7e908048
|
||||
.long 0xbac2fd7b, 0x878a92a7
|
||||
.long 0xa60ce07b, 0x1b3d8f29
|
||||
.long 0xce7f39f4, 0xdaece73e
|
||||
.long 0x61d82e56, 0xf1d0f55e
|
||||
.long 0xd270f1a2, 0xab7aff2a
|
||||
.long 0xc619809d, 0xa87ab8a8
|
||||
.long 0x2b3cac5d, 0x2162d385
|
||||
.long 0x65863b64, 0x8462d800
|
||||
.long 0x1b03397f, 0x83348832
|
||||
.long 0xebb883bd, 0x71d111a8
|
||||
.long 0xb3e32c28, 0x299847d5
|
||||
.long 0x064f7f26, 0xffd852c6
|
||||
.long 0xdd7e3b0c, 0xb9e02b86
|
||||
.long 0xf285651c, 0xdcb17aa4
|
||||
.long 0x10746f3c, 0x18b33a4e
|
||||
.long 0xc7a68855, 0xf37c5aee
|
||||
.long 0x271d9844, 0xb6dd949b
|
||||
.long 0x8e766a0c, 0x6051d5a2
|
||||
.long 0x93a5f730, 0x78d9ccb7
|
||||
.long 0x6cb08e5c, 0x18b0d4ff
|
||||
.long 0x6b749fb2, 0xbac2fd7b
|
||||
.long 0x1393e203, 0x21f3d99c
|
||||
.long 0xcec3662e, 0xa60ce07b
|
||||
.long 0x96c515bb, 0x8f158014
|
||||
.long 0xe6fc4e6a, 0xce7f39f4
|
||||
.long 0x8227bb8a, 0xa00457f7
|
||||
.long 0xb0cd4768, 0x61d82e56
|
||||
.long 0x39c7ff35, 0x8d6d2c43
|
||||
.long 0xd7a4825c, 0xd270f1a2
|
||||
.long 0x0ab3844b, 0x00ac29cf
|
||||
.long 0x0167d312, 0xc619809d
|
||||
.long 0xf6076544, 0xe9adf796
|
||||
.long 0x26f6a60a, 0x2b3cac5d
|
||||
.long 0xa741c1bf, 0x96638b34
|
||||
.long 0x98d8d9cb, 0x65863b64
|
||||
.long 0x49c3cc9c, 0xe0e9f351
|
||||
.long 0x68bce87a, 0x1b03397f
|
||||
.long 0x57a3d037, 0x9af01f2d
|
||||
.long 0x6956fc3b, 0xebb883bd
|
||||
.long 0x42d98888, 0x2cff42cf
|
||||
.long 0x3771e98f, 0xb3e32c28
|
||||
.long 0xb42ae3d9, 0x88f25a3a
|
||||
.long 0x2178513a, 0x064f7f26
|
||||
.long 0xe0ac139e, 0x4e36f0b0
|
||||
.long 0x170076fa, 0xdd7e3b0c
|
||||
.long 0x444dd413, 0xbd6f81f8
|
||||
.long 0x6f345e45, 0xf285651c
|
||||
.long 0x41d17b64, 0x91c9bd4b
|
||||
.long 0xff0dba97, 0x10746f3c
|
||||
.long 0xa2b73df1, 0x885f087b
|
||||
.long 0xf872e54c, 0xc7a68855
|
||||
.long 0x1e41e9fc, 0x4c144932
|
||||
.long 0x86d8e4d2, 0x271d9844
|
||||
.long 0x651bd98b, 0x52148f02
|
||||
.long 0x5bb8f1bc, 0x8e766a0c
|
||||
.long 0xa90fd27a, 0xa3c6f37a
|
||||
.long 0xb3af077a, 0x93a5f730
|
||||
.long 0x4984d782, 0xd7c0557f
|
||||
.long 0xca6ef3ac, 0x6cb08e5c
|
||||
.long 0x234e0b26, 0x63ded06a
|
||||
.long 0xdd66cbbb, 0x6b749fb2
|
||||
.long 0x4597456a, 0x4d56973c
|
||||
.long 0xe9e28eb4, 0x1393e203
|
||||
.long 0x7b3ff57a, 0x9669c9df
|
||||
.long 0xc9c8b782, 0xcec3662e
|
||||
.long 0x3f70cc6f, 0xe417f38a
|
||||
.long 0x93e106a4, 0x96c515bb
|
||||
.long 0x62ec6c6d, 0x4b9e0f71
|
||||
.long 0xd813b325, 0xe6fc4e6a
|
||||
.long 0x0df04680, 0xd104b8fc
|
||||
.long 0x2342001e, 0x8227bb8a
|
||||
.long 0x0a2a8d7e, 0x5b397730
|
||||
.long 0x6d9a4957, 0xb0cd4768
|
||||
.long 0xe8b6368b, 0xe78eb416
|
||||
.long 0xd2c3ed1a, 0x39c7ff35
|
||||
.long 0x995a5724, 0x61ff0e01
|
||||
.long 0x9ef68d35, 0xd7a4825c
|
||||
.long 0x0c139b31, 0x8d96551c
|
||||
.long 0xf2271e60, 0x0ab3844b
|
||||
.long 0x0b0bf8ca, 0x0bf80dd2
|
||||
.long 0x2664fd8b, 0x0167d312
|
||||
.long 0xed64812d, 0x8821abed
|
||||
.long 0x02ee03b2, 0xf6076544
|
||||
.long 0x8604ae0f, 0x6a45d2b2
|
||||
.long 0x363bd6b3, 0x26f6a60a
|
||||
.long 0x135c83fd, 0xd8d26619
|
||||
.long 0x5fabe670, 0xa741c1bf
|
||||
.long 0x35ec3279, 0xde87806c
|
||||
.long 0x00bcf5f6, 0x98d8d9cb
|
||||
.long 0x8ae00689, 0x14338754
|
||||
.long 0x17f27698, 0x49c3cc9c
|
||||
.long 0x58ca5f00, 0x5bd2011f
|
||||
.long 0xaa7c7ad5, 0x68bce87a
|
||||
.long 0xb5cfca28, 0xdd07448e
|
||||
.long 0xded288f8, 0x57a3d037
|
||||
.long 0x59f229bc, 0xdde8f5b9
|
||||
.long 0x6d390dec, 0x6956fc3b
|
||||
.long 0x37170390, 0xa3e3e02c
|
||||
.long 0x6353c1cc, 0x42d98888
|
||||
.long 0xc4584f5c, 0xd73c7bea
|
||||
.long 0xf48642e9, 0x3771e98f
|
||||
.long 0x531377e2, 0x80ff0093
|
||||
.long 0xdd35bc8d, 0xb42ae3d9
|
||||
.long 0xb25b29f2, 0x8fe4c34d
|
||||
.long 0x9a5ede41, 0x2178513a
|
||||
.long 0xa563905d, 0xdf99fc11
|
||||
.long 0x45cddf4e, 0xe0ac139e
|
||||
.long 0xacfa3103, 0x6c23e841
|
||||
.long 0xa51b6135, 0x170076fa
|
||||
24
pkgs/crc32c/crc32c_test.go
Normal file
24
pkgs/crc32c/crc32c_test.go
Normal file
@ -0,0 +1,24 @@
|
||||
package crc32c
|
||||
|
||||
import (
|
||||
. "gopkg.in/check.v1"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func Test(t *testing.T) { TestingT(t) }
|
||||
|
||||
type MySuite struct{}
|
||||
|
||||
var _ = Suite(&MySuite{})
|
||||
|
||||
func (s *MySuite) TestCrc32c(c *C) {
|
||||
data_1 := []byte("Lorem Ipsum is simply dummy text of the printing and typesetting industry")
|
||||
crc, err := Crc32c(data_1)
|
||||
c.Assert(err, IsNil)
|
||||
|
||||
data_2 := []byte("Lorem Ipsum is simply dummy text of the printing and typesetting industry")
|
||||
newcrc, newerr := Crc32c(data_2)
|
||||
c.Assert(newerr, IsNil)
|
||||
|
||||
c.Assert(crc, Equals, newcrc)
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user