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79a3d5ce15
Start a list of which ops are valid for the default node struct implementation (currently all of them). Add a Node implementation helper for a minimal node. Passes buildall w/ toolstash -cmp. Change-Id: I7ae45f2cf2be85013cb71ab00524be53f243e13d Reviewed-on: https://go-review.googlesource.com/c/go/+/274088 Trust: Russ Cox <rsc@golang.org> Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
// Copyright 2017 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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package ir
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type bitset8 uint8
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func (f *bitset8) set(mask uint8, b bool) {
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if b {
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*(*uint8)(f) |= mask
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} else {
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*(*uint8)(f) &^= mask
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}
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}
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func (f bitset8) get2(shift uint8) uint8 {
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return uint8(f>>shift) & 3
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}
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// set2 sets two bits in f using the bottom two bits of b.
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func (f *bitset8) set2(shift uint8, b uint8) {
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// Clear old bits.
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*(*uint8)(f) &^= 3 << shift
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// Set new bits.
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*(*uint8)(f) |= uint8(b&3) << shift
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}
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type bitset16 uint16
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func (f *bitset16) set(mask uint16, b bool) {
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if b {
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*(*uint16)(f) |= mask
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} else {
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*(*uint16)(f) &^= mask
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}
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}
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type bitset32 uint32
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func (f *bitset32) set(mask uint32, b bool) {
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if b {
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*(*uint32)(f) |= mask
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} else {
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*(*uint32)(f) &^= mask
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}
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}
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func (f bitset32) get2(shift uint8) uint8 {
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return uint8(f>>shift) & 3
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}
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// set2 sets two bits in f using the bottom two bits of b.
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func (f *bitset32) set2(shift uint8, b uint8) {
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// Clear old bits.
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*(*uint32)(f) &^= 3 << shift
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// Set new bits.
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*(*uint32)(f) |= uint32(b&3) << shift
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}
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func (f bitset32) get3(shift uint8) uint8 {
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return uint8(f>>shift) & 7
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}
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// set3 sets three bits in f using the bottom three bits of b.
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func (f *bitset32) set3(shift uint8, b uint8) {
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// Clear old bits.
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*(*uint32)(f) &^= 7 << shift
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// Set new bits.
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*(*uint32)(f) |= uint32(b&7) << shift
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}
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