jochen
e1f5d4fdf0
The controller imports mesh-host/validate through a replace onto the forge that holds it, and every build — the build agent's go build in a fresh toolchain container, the Dockerfile's go mod download — would have fetched it through the public proxy and checksum database at build time: a merge breaking main on the network, the class Phase 1 removes. vendor/ is committed; go builds from it with nothing fetched, and refuses to build when it and go.mod disagree, so a pin moved without go mod vendor fails at once. The Dockerfile copies vendor/ and builds with GOPROXY=off.
51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
//go:build !386
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// Package regmask provides masks for variable shift counts.
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//
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// Go defines a shift by more than the width of the shifted value as producing
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// zero, so the compiler has to guard every variable shift against that: on
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// amd64 with a CMP and an SBB, on arm64 with a CMP and a CSEL, and so on. When
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// the count is known to be smaller than the width anyway, masking it with the
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// width minus one lets the compiler drop the guard. The mask itself costs
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// nothing on the architectures whose shift instructions already use only the
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// low bits of the count, which the compiler knows about.
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//
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// Each constant is named for the width of the value being shifted and the type
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// of the shift count, and may only be used where the count is always smaller
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// than that width:
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//
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// x := y >> (n & regmask.Shift64ByUint) // y is 64 bits, n is a uint below 64
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package regmask
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const (
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// ShiftNByUint8 - shifting an N bit value by a uint8
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Shift8ByUint8 = 7
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Shift16ByUint8 = 15
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Shift32ByUint8 = 31
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Shift64ByUint8 = 63
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// ShiftNByUint16 - shifting an N bit value by a uint16
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Shift8ByUint16 = Shift8ByUint8
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Shift16ByUint16 = Shift16ByUint8
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Shift32ByUint16 = Shift32ByUint8
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Shift64ByUint16 = Shift64ByUint8
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// ShiftNByUint32 - shifting an N bit value by a uint32
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Shift8ByUint32 = Shift8ByUint8
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Shift16ByUint32 = Shift16ByUint8
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Shift32ByUint32 = Shift32ByUint8
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Shift64ByUint32 = Shift64ByUint8
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// ShiftNByUint64 - shifting an N bit value by a uint64
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Shift8ByUint64 = Shift8ByUint8
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Shift16ByUint64 = Shift16ByUint8
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Shift32ByUint64 = Shift32ByUint8
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Shift64ByUint64 = Shift64ByUint8
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// ShiftNByUint - shifting an N bit value by a uint
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Shift8ByUint = Shift8ByUint8
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Shift16ByUint = Shift16ByUint8
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Shift32ByUint = Shift32ByUint8
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Shift64ByUint = Shift64ByUint8
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)
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