mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-24 12:27:17 +00:00
289b30715d
This commit converts the dependency management from Godeps to the vendor folder, also switching the tool from godep to trash. Since the upstream tool lacks a few features proposed via a few PRs, until those PRs are merged in (if), use github.com/karalabe/trash. You can update dependencies via trash --update. All dependencies have been updated to their latest version. Parts of the build system are reworked to drop old notions of Godeps and invocation of the go vet command so that it doesn't run against the vendor folder, as that will just blow up during vetting. The conversion drops OpenCL (and hence GPU mining support) from ethash and our codebase. The short reasoning is that there's noone to maintain and having opencl libs in our deps messes up builds as go install ./... tries to build them, failing with unsatisfied link errors for the C OpenCL deps. golang.org/x/net/context is not vendored in. We expect it to be fetched by the user (i.e. using go get). To keep ci.go builds reproducible the package is "vendored" in build/_vendor.
491 lines
12 KiB
ArmAsm
491 lines
12 KiB
ArmAsm
// 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 !appengine
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// +build gc
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// +build !noasm
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#include "textflag.h"
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// The asm code generally follows the pure Go code in decode_other.go, except
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// where marked with a "!!!".
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// func decode(dst, src []byte) int
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//
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// All local variables fit into registers. The non-zero stack size is only to
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// spill registers and push args when issuing a CALL. The register allocation:
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// - AX scratch
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// - BX scratch
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// - CX length or x
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// - DX offset
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// - SI &src[s]
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// - DI &dst[d]
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// + R8 dst_base
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// + R9 dst_len
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// + R10 dst_base + dst_len
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// + R11 src_base
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// + R12 src_len
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// + R13 src_base + src_len
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// - R14 used by doCopy
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// - R15 used by doCopy
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//
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// The registers R8-R13 (marked with a "+") are set at the start of the
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// function, and after a CALL returns, and are not otherwise modified.
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//
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// The d variable is implicitly DI - R8, and len(dst)-d is R10 - DI.
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// The s variable is implicitly SI - R11, and len(src)-s is R13 - SI.
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TEXT ·decode(SB), NOSPLIT, $48-56
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// Initialize SI, DI and R8-R13.
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MOVQ dst_base+0(FP), R8
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MOVQ dst_len+8(FP), R9
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MOVQ R8, DI
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MOVQ R8, R10
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ADDQ R9, R10
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MOVQ src_base+24(FP), R11
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MOVQ src_len+32(FP), R12
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MOVQ R11, SI
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MOVQ R11, R13
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ADDQ R12, R13
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loop:
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// for s < len(src)
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CMPQ SI, R13
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JEQ end
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// CX = uint32(src[s])
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//
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// switch src[s] & 0x03
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MOVBLZX (SI), CX
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MOVL CX, BX
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ANDL $3, BX
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CMPL BX, $1
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JAE tagCopy
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// ----------------------------------------
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// The code below handles literal tags.
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// case tagLiteral:
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// x := uint32(src[s] >> 2)
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// switch
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SHRL $2, CX
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CMPL CX, $60
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JAE tagLit60Plus
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// case x < 60:
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// s++
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INCQ SI
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doLit:
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// This is the end of the inner "switch", when we have a literal tag.
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//
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// We assume that CX == x and x fits in a uint32, where x is the variable
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// used in the pure Go decode_other.go code.
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// length = int(x) + 1
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//
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// Unlike the pure Go code, we don't need to check if length <= 0 because
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// CX can hold 64 bits, so the increment cannot overflow.
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INCQ CX
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// Prepare to check if copying length bytes will run past the end of dst or
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// src.
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//
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// AX = len(dst) - d
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// BX = len(src) - s
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MOVQ R10, AX
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SUBQ DI, AX
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MOVQ R13, BX
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SUBQ SI, BX
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// !!! Try a faster technique for short (16 or fewer bytes) copies.
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//
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// if length > 16 || len(dst)-d < 16 || len(src)-s < 16 {
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// goto callMemmove // Fall back on calling runtime·memmove.
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// }
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//
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// The C++ snappy code calls this TryFastAppend. It also checks len(src)-s
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// against 21 instead of 16, because it cannot assume that all of its input
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// is contiguous in memory and so it needs to leave enough source bytes to
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// read the next tag without refilling buffers, but Go's Decode assumes
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// contiguousness (the src argument is a []byte).
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CMPQ CX, $16
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JGT callMemmove
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CMPQ AX, $16
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JLT callMemmove
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CMPQ BX, $16
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JLT callMemmove
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// !!! Implement the copy from src to dst as a 16-byte load and store.
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// (Decode's documentation says that dst and src must not overlap.)
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//
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// This always copies 16 bytes, instead of only length bytes, but that's
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// OK. If the input is a valid Snappy encoding then subsequent iterations
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// will fix up the overrun. Otherwise, Decode returns a nil []byte (and a
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// non-nil error), so the overrun will be ignored.
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//
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// Note that on amd64, it is legal and cheap to issue unaligned 8-byte or
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// 16-byte loads and stores. This technique probably wouldn't be as
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// effective on architectures that are fussier about alignment.
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MOVOU 0(SI), X0
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MOVOU X0, 0(DI)
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// d += length
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// s += length
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ADDQ CX, DI
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ADDQ CX, SI
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JMP loop
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callMemmove:
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// if length > len(dst)-d || length > len(src)-s { etc }
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CMPQ CX, AX
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JGT errCorrupt
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CMPQ CX, BX
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JGT errCorrupt
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// copy(dst[d:], src[s:s+length])
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//
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// This means calling runtime·memmove(&dst[d], &src[s], length), so we push
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// DI, SI and CX as arguments. Coincidentally, we also need to spill those
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// three registers to the stack, to save local variables across the CALL.
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MOVQ DI, 0(SP)
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MOVQ SI, 8(SP)
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MOVQ CX, 16(SP)
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MOVQ DI, 24(SP)
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MOVQ SI, 32(SP)
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MOVQ CX, 40(SP)
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CALL runtime·memmove(SB)
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// Restore local variables: unspill registers from the stack and
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// re-calculate R8-R13.
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MOVQ 24(SP), DI
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MOVQ 32(SP), SI
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MOVQ 40(SP), CX
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MOVQ dst_base+0(FP), R8
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MOVQ dst_len+8(FP), R9
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MOVQ R8, R10
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ADDQ R9, R10
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MOVQ src_base+24(FP), R11
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MOVQ src_len+32(FP), R12
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MOVQ R11, R13
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ADDQ R12, R13
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// d += length
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// s += length
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ADDQ CX, DI
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ADDQ CX, SI
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JMP loop
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tagLit60Plus:
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// !!! This fragment does the
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//
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// s += x - 58; if uint(s) > uint(len(src)) { etc }
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//
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// checks. In the asm version, we code it once instead of once per switch case.
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ADDQ CX, SI
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SUBQ $58, SI
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MOVQ SI, BX
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SUBQ R11, BX
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CMPQ BX, R12
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JA errCorrupt
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// case x == 60:
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CMPL CX, $61
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JEQ tagLit61
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JA tagLit62Plus
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// x = uint32(src[s-1])
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MOVBLZX -1(SI), CX
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JMP doLit
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tagLit61:
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// case x == 61:
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// x = uint32(src[s-2]) | uint32(src[s-1])<<8
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MOVWLZX -2(SI), CX
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JMP doLit
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tagLit62Plus:
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CMPL CX, $62
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JA tagLit63
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// case x == 62:
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// x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
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MOVWLZX -3(SI), CX
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MOVBLZX -1(SI), BX
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SHLL $16, BX
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ORL BX, CX
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JMP doLit
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tagLit63:
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// case x == 63:
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// x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
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MOVL -4(SI), CX
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JMP doLit
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// The code above handles literal tags.
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// ----------------------------------------
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// The code below handles copy tags.
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tagCopy4:
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// case tagCopy4:
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// s += 5
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ADDQ $5, SI
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// if uint(s) > uint(len(src)) { etc }
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MOVQ SI, BX
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SUBQ R11, BX
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CMPQ BX, R12
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JA errCorrupt
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// length = 1 + int(src[s-5])>>2
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SHRQ $2, CX
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INCQ CX
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// offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
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MOVLQZX -4(SI), DX
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JMP doCopy
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tagCopy2:
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// case tagCopy2:
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// s += 3
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ADDQ $3, SI
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// if uint(s) > uint(len(src)) { etc }
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MOVQ SI, BX
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SUBQ R11, BX
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CMPQ BX, R12
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JA errCorrupt
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// length = 1 + int(src[s-3])>>2
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SHRQ $2, CX
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INCQ CX
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// offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
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MOVWQZX -2(SI), DX
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JMP doCopy
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tagCopy:
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// We have a copy tag. We assume that:
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// - BX == src[s] & 0x03
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// - CX == src[s]
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CMPQ BX, $2
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JEQ tagCopy2
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JA tagCopy4
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// case tagCopy1:
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// s += 2
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ADDQ $2, SI
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// if uint(s) > uint(len(src)) { etc }
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MOVQ SI, BX
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SUBQ R11, BX
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CMPQ BX, R12
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JA errCorrupt
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// offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
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MOVQ CX, DX
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ANDQ $0xe0, DX
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SHLQ $3, DX
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MOVBQZX -1(SI), BX
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ORQ BX, DX
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// length = 4 + int(src[s-2])>>2&0x7
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SHRQ $2, CX
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ANDQ $7, CX
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ADDQ $4, CX
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doCopy:
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// This is the end of the outer "switch", when we have a copy tag.
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//
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// We assume that:
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// - CX == length && CX > 0
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// - DX == offset
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// if offset <= 0 { etc }
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CMPQ DX, $0
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JLE errCorrupt
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// if d < offset { etc }
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MOVQ DI, BX
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SUBQ R8, BX
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CMPQ BX, DX
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JLT errCorrupt
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// if length > len(dst)-d { etc }
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MOVQ R10, BX
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SUBQ DI, BX
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CMPQ CX, BX
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JGT errCorrupt
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// forwardCopy(dst[d:d+length], dst[d-offset:]); d += length
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//
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// Set:
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// - R14 = len(dst)-d
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// - R15 = &dst[d-offset]
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MOVQ R10, R14
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SUBQ DI, R14
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MOVQ DI, R15
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SUBQ DX, R15
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// !!! Try a faster technique for short (16 or fewer bytes) forward copies.
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//
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// First, try using two 8-byte load/stores, similar to the doLit technique
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// above. Even if dst[d:d+length] and dst[d-offset:] can overlap, this is
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// still OK if offset >= 8. Note that this has to be two 8-byte load/stores
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// and not one 16-byte load/store, and the first store has to be before the
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// second load, due to the overlap if offset is in the range [8, 16).
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//
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// if length > 16 || offset < 8 || len(dst)-d < 16 {
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// goto slowForwardCopy
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// }
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// copy 16 bytes
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// d += length
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CMPQ CX, $16
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JGT slowForwardCopy
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CMPQ DX, $8
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JLT slowForwardCopy
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CMPQ R14, $16
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JLT slowForwardCopy
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MOVQ 0(R15), AX
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MOVQ AX, 0(DI)
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MOVQ 8(R15), BX
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MOVQ BX, 8(DI)
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ADDQ CX, DI
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JMP loop
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slowForwardCopy:
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// !!! If the forward copy is longer than 16 bytes, or if offset < 8, we
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// can still try 8-byte load stores, provided we can overrun up to 10 extra
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// bytes. As above, the overrun will be fixed up by subsequent iterations
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// of the outermost loop.
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//
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// The C++ snappy code calls this technique IncrementalCopyFastPath. Its
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// commentary says:
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//
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// ----
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//
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// The main part of this loop is a simple copy of eight bytes at a time
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// until we've copied (at least) the requested amount of bytes. However,
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// if d and d-offset are less than eight bytes apart (indicating a
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// repeating pattern of length < 8), we first need to expand the pattern in
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// order to get the correct results. For instance, if the buffer looks like
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// this, with the eight-byte <d-offset> and <d> patterns marked as
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// intervals:
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//
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// abxxxxxxxxxxxx
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// [------] d-offset
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// [------] d
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//
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// a single eight-byte copy from <d-offset> to <d> will repeat the pattern
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// once, after which we can move <d> two bytes without moving <d-offset>:
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//
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// ababxxxxxxxxxx
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// [------] d-offset
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// [------] d
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//
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// and repeat the exercise until the two no longer overlap.
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//
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// This allows us to do very well in the special case of one single byte
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// repeated many times, without taking a big hit for more general cases.
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//
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// The worst case of extra writing past the end of the match occurs when
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// offset == 1 and length == 1; the last copy will read from byte positions
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// [0..7] and write to [4..11], whereas it was only supposed to write to
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// position 1. Thus, ten excess bytes.
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//
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// ----
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//
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// That "10 byte overrun" worst case is confirmed by Go's
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// TestSlowForwardCopyOverrun, which also tests the fixUpSlowForwardCopy
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// and finishSlowForwardCopy algorithm.
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//
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// if length > len(dst)-d-10 {
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// goto verySlowForwardCopy
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// }
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SUBQ $10, R14
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CMPQ CX, R14
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JGT verySlowForwardCopy
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makeOffsetAtLeast8:
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// !!! As above, expand the pattern so that offset >= 8 and we can use
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// 8-byte load/stores.
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//
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// for offset < 8 {
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// copy 8 bytes from dst[d-offset:] to dst[d:]
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// length -= offset
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// d += offset
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// offset += offset
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// // The two previous lines together means that d-offset, and therefore
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// // R15, is unchanged.
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// }
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CMPQ DX, $8
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JGE fixUpSlowForwardCopy
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MOVQ (R15), BX
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MOVQ BX, (DI)
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SUBQ DX, CX
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ADDQ DX, DI
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ADDQ DX, DX
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JMP makeOffsetAtLeast8
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fixUpSlowForwardCopy:
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// !!! Add length (which might be negative now) to d (implied by DI being
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// &dst[d]) so that d ends up at the right place when we jump back to the
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// top of the loop. Before we do that, though, we save DI to AX so that, if
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// length is positive, copying the remaining length bytes will write to the
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// right place.
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MOVQ DI, AX
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ADDQ CX, DI
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finishSlowForwardCopy:
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// !!! Repeat 8-byte load/stores until length <= 0. Ending with a negative
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// length means that we overrun, but as above, that will be fixed up by
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// subsequent iterations of the outermost loop.
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CMPQ CX, $0
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JLE loop
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MOVQ (R15), BX
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MOVQ BX, (AX)
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ADDQ $8, R15
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ADDQ $8, AX
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SUBQ $8, CX
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JMP finishSlowForwardCopy
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verySlowForwardCopy:
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// verySlowForwardCopy is a simple implementation of forward copy. In C
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// parlance, this is a do/while loop instead of a while loop, since we know
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// that length > 0. In Go syntax:
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//
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// for {
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// dst[d] = dst[d - offset]
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// d++
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// length--
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// if length == 0 {
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// break
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// }
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// }
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MOVB (R15), BX
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MOVB BX, (DI)
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INCQ R15
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INCQ DI
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DECQ CX
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JNZ verySlowForwardCopy
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JMP loop
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// The code above handles copy tags.
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// ----------------------------------------
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end:
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// This is the end of the "for s < len(src)".
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//
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// if d != len(dst) { etc }
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CMPQ DI, R10
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JNE errCorrupt
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// return 0
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MOVQ $0, ret+48(FP)
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RET
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errCorrupt:
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// return decodeErrCodeCorrupt
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MOVQ $1, ret+48(FP)
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RET
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