Fast implementation of Git in pure Go
codeberg.org/lindenii/furgit
git
go
Vendor a minimal internal/cpu for AMD64 only
+92
-5
-2
go.mod
-2
go.mod
-2
go.sum
-2
go.sum
+1
-1
internal/adler32/adler32_amd64.go
+1
-1
internal/adler32/adler32_amd64.go
+27
internal/cpu/LICENSE
+27
internal/cpu/LICENSE
···
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Copyright 2009 The Go Authors.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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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 disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google LLC nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+6
internal/cpu/cpu.go
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internal/cpu/cpu.go
+33
internal/cpu/cpu_amd64.go
+33
internal/cpu/cpu_amd64.go
···
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//go:build amd64 && !purego
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package cpu
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const (
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cpuidOSXSAVE = 1 << 27
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cpuidAVX = 1 << 28
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cpuidAVX2 = 1 << 5
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)
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// cpuid is implemented in cpu_amd64.s.
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func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
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// xgetbv with ecx = 0 is implemented in cpu_amd64.s.
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func xgetbv() (eax, edx uint32)
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func init() {
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maxID, _, _, _ := cpuid(0, 0)
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if maxID < 7 {
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return
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}
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_, _, ecx1, _ := cpuid(1, 0)
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osSupportsAVX := false
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if ecx1&cpuidOSXSAVE != 0 {
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eax, _ := xgetbv()
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osSupportsAVX = eax&(1<<1) != 0 && eax&(1<<2) != 0
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}
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_, ebx7, _, _ := cpuid(7, 0)
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X86.HasAVX2 = osSupportsAVX && ecx1&cpuidAVX != 0 && ebx7&cpuidAVX2 != 0
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}
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internal/cpu/cpu_amd64.s
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internal/cpu/cpu_amd64.s
···
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//go:build amd64 && !purego
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#include "textflag.h"
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// func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
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TEXT ·cpuid(SB), NOSPLIT, $0-24
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MOVL eaxArg+0(FP), AX
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MOVL ecxArg+4(FP), CX
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CPUID
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MOVL AX, eax+8(FP)
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MOVL BX, ebx+12(FP)
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MOVL CX, ecx+16(FP)
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MOVL DX, edx+20(FP)
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RET
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// func xgetbv() (eax, edx uint32)
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TEXT ·xgetbv(SB), NOSPLIT, $0-8
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MOVL $0, CX
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XGETBV
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MOVL AX, eax+0(FP)
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MOVL DX, edx+4(FP)
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RET