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[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
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kim
GitHub
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398 changed files with 86174 additions and 684 deletions
271
vendor/github.com/tetratelabs/wazero/internal/moremath/moremath.go
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vendored
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271
vendor/github.com/tetratelabs/wazero/internal/moremath/moremath.go
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package moremath
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import (
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"math"
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)
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/syntax/values.html#floating-point
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const (
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// F32CanonicalNaNBits is the 32-bit float where payload's MSB equals 1 and others are all zero.
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F32CanonicalNaNBits = uint32(0x7fc0_0000)
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// F32CanonicalNaNBitsMask can be used to judge the value `v` is canonical nan as "v&F32CanonicalNaNBitsMask == F32CanonicalNaNBits"
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F32CanonicalNaNBitsMask = uint32(0x7fff_ffff)
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// F64CanonicalNaNBits is the 64-bit float where payload's MSB equals 1 and others are all zero.
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F64CanonicalNaNBits = uint64(0x7ff8_0000_0000_0000)
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// F64CanonicalNaNBitsMask can be used to judge the value `v` is canonical nan as "v&F64CanonicalNaNBitsMask == F64CanonicalNaNBits"
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F64CanonicalNaNBitsMask = uint64(0x7fff_ffff_ffff_ffff)
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// F32ArithmeticNaNPayloadMSB is used to extract the most significant bit of payload of 32-bit arithmetic NaN values
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F32ArithmeticNaNPayloadMSB = uint32(0x0040_0000)
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// F32ExponentMask is used to extract the exponent of 32-bit floating point.
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F32ExponentMask = uint32(0x7f80_0000)
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// F32ArithmeticNaNBits is an example 32-bit arithmetic NaN.
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F32ArithmeticNaNBits = F32CanonicalNaNBits | 0b1 // Set first bit to make this different from the canonical NaN.
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// F64ArithmeticNaNPayloadMSB is used to extract the most significant bit of payload of 64-bit arithmetic NaN values
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F64ArithmeticNaNPayloadMSB = uint64(0x0008_0000_0000_0000)
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// F64ExponentMask is used to extract the exponent of 64-bit floating point.
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F64ExponentMask = uint64(0x7ff0_0000_0000_0000)
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// F64ArithmeticNaNBits is an example 64-bit arithmetic NaN.
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F64ArithmeticNaNBits = F64CanonicalNaNBits | 0b1 // Set first bit to make this different from the canonical NaN.
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)
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// WasmCompatMin64 is the Wasm spec compatible variant of math.Min for 64-bit floating points.
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func WasmCompatMin64(x, y float64) float64 {
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switch {
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case math.IsNaN(x) || math.IsNaN(y):
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return returnF64NaNBinOp(x, y)
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case math.IsInf(x, -1) || math.IsInf(y, -1):
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return math.Inf(-1)
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case x == 0 && x == y:
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if math.Signbit(x) {
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return x
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}
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return y
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}
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if x < y {
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return x
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}
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return y
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}
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// WasmCompatMin32 is the Wasm spec compatible variant of math.Min for 32-bit floating points.
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func WasmCompatMin32(x, y float32) float32 {
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x64, y64 := float64(x), float64(y)
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switch {
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case math.IsNaN(x64) || math.IsNaN(y64):
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return returnF32NaNBinOp(x, y)
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case math.IsInf(x64, -1) || math.IsInf(y64, -1):
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return float32(math.Inf(-1))
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case x == 0 && x == y:
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if math.Signbit(x64) {
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return x
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}
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return y
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}
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if x < y {
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return x
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}
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return y
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}
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// WasmCompatMax64 is the Wasm spec compatible variant of math.Max for 64-bit floating points.
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func WasmCompatMax64(x, y float64) float64 {
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switch {
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case math.IsNaN(x) || math.IsNaN(y):
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return returnF64NaNBinOp(x, y)
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case math.IsInf(x, 1) || math.IsInf(y, 1):
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return math.Inf(1)
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case x == 0 && x == y:
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if math.Signbit(x) {
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return y
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}
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return x
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}
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if x > y {
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return x
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}
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return y
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}
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// WasmCompatMax32 is the Wasm spec compatible variant of math.Max for 32-bit floating points.
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func WasmCompatMax32(x, y float32) float32 {
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x64, y64 := float64(x), float64(y)
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switch {
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case math.IsNaN(x64) || math.IsNaN(y64):
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return returnF32NaNBinOp(x, y)
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case math.IsInf(x64, 1) || math.IsInf(y64, 1):
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return float32(math.Inf(1))
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case x == 0 && x == y:
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if math.Signbit(x64) {
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return y
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}
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return x
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}
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if x > y {
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return x
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}
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return y
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}
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// WasmCompatNearestF32 is the Wasm spec compatible variant of math.Round, used for Nearest instruction.
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// For example, this converts 1.9 to 2.0, and this has the semantics of LLVM's rint intrinsic.
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//
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// e.g. math.Round(-4.5) results in -5 while this results in -4.
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//
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// See https://llvm.org/docs/LangRef.html#llvm-rint-intrinsic.
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func WasmCompatNearestF32(f float32) float32 {
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var res float32
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// TODO: look at https://github.com/bytecodealliance/wasmtime/pull/2171 and reconsider this algorithm
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if f != 0 {
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ceil := float32(math.Ceil(float64(f)))
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floor := float32(math.Floor(float64(f)))
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distToCeil := math.Abs(float64(f - ceil))
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distToFloor := math.Abs(float64(f - floor))
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h := ceil / 2.0
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if distToCeil < distToFloor {
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res = ceil
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} else if distToCeil == distToFloor && float32(math.Floor(float64(h))) == h {
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res = ceil
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} else {
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res = floor
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}
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} else {
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res = f
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}
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return returnF32UniOp(f, res)
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}
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// WasmCompatNearestF64 is the Wasm spec compatible variant of math.Round, used for Nearest instruction.
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// For example, this converts 1.9 to 2.0, and this has the semantics of LLVM's rint intrinsic.
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//
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// e.g. math.Round(-4.5) results in -5 while this results in -4.
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//
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// See https://llvm.org/docs/LangRef.html#llvm-rint-intrinsic.
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func WasmCompatNearestF64(f float64) float64 {
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// TODO: look at https://github.com/bytecodealliance/wasmtime/pull/2171 and reconsider this algorithm
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var res float64
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if f != 0 {
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ceil := math.Ceil(f)
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floor := math.Floor(f)
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distToCeil := math.Abs(f - ceil)
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distToFloor := math.Abs(f - floor)
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h := ceil / 2.0
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if distToCeil < distToFloor {
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res = ceil
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} else if distToCeil == distToFloor && math.Floor(h) == h {
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res = ceil
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} else {
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res = floor
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}
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} else {
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res = f
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}
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return returnF64UniOp(f, res)
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}
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// WasmCompatCeilF32 is the same as math.Ceil on 32-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatCeilF32(f float32) float32 {
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return returnF32UniOp(f, float32(math.Ceil(float64(f))))
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}
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// WasmCompatCeilF64 is the same as math.Ceil on 64-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatCeilF64(f float64) float64 {
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return returnF64UniOp(f, math.Ceil(f))
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}
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// WasmCompatFloorF32 is the same as math.Floor on 32-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatFloorF32(f float32) float32 {
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return returnF32UniOp(f, float32(math.Floor(float64(f))))
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}
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// WasmCompatFloorF64 is the same as math.Floor on 64-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatFloorF64(f float64) float64 {
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return returnF64UniOp(f, math.Floor(f))
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}
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// WasmCompatTruncF32 is the same as math.Trunc on 32-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatTruncF32(f float32) float32 {
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return returnF32UniOp(f, float32(math.Trunc(float64(f))))
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}
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// WasmCompatTruncF64 is the same as math.Trunc on 64-bit except that
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// the returned NaN value follows the Wasm specification on NaN
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// propagation.
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// https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func WasmCompatTruncF64(f float64) float64 {
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return returnF64UniOp(f, math.Trunc(f))
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}
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func f32IsNaN(v float32) bool {
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return v != v // this is how NaN is defined.
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}
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func f64IsNaN(v float64) bool {
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return v != v // this is how NaN is defined.
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}
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// returnF32UniOp returns the result of 32-bit unary operation. This accepts `original` which is the operand,
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// and `result` which is its result. This returns the `result` as-is if the result is not NaN. Otherwise, this follows
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// the same logic as in the reference interpreter as well as the amd64 and arm64 floating point handling.
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func returnF32UniOp(original, result float32) float32 {
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// Following the same logic as in the reference interpreter:
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// https://github.com/WebAssembly/spec/blob/d48af683f5e6d00c13f775ab07d29a15daf92203/interpreter/exec/fxx.ml#L115-L122
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if !f32IsNaN(result) {
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return result
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}
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if !f32IsNaN(original) {
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return math.Float32frombits(F32CanonicalNaNBits)
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}
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return math.Float32frombits(math.Float32bits(original) | F32CanonicalNaNBits)
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}
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// returnF32UniOp returns the result of 64-bit unary operation. This accepts `original` which is the operand,
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// and `result` which is its result. This returns the `result` as-is if the result is not NaN. Otherwise, this follows
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// the same logic as in the reference interpreter as well as the amd64 and arm64 floating point handling.
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func returnF64UniOp(original, result float64) float64 {
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// Following the same logic as in the reference interpreter (== amd64 and arm64's behavior):
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// https://github.com/WebAssembly/spec/blob/d48af683f5e6d00c13f775ab07d29a15daf92203/interpreter/exec/fxx.ml#L115-L122
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if !f64IsNaN(result) {
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return result
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}
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if !f64IsNaN(original) {
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return math.Float64frombits(F64CanonicalNaNBits)
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}
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return math.Float64frombits(math.Float64bits(original) | F64CanonicalNaNBits)
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}
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// returnF64NaNBinOp returns a NaN for 64-bit binary operations. `x` and `y` are original floats
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// and at least one of them is NaN. The returned NaN is guaranteed to comply with the NaN propagation
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// procedure: https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func returnF64NaNBinOp(x, y float64) float64 {
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if f64IsNaN(x) {
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return math.Float64frombits(math.Float64bits(x) | F64CanonicalNaNBits)
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} else {
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return math.Float64frombits(math.Float64bits(y) | F64CanonicalNaNBits)
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}
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}
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// returnF64NaNBinOp returns a NaN for 32-bit binary operations. `x` and `y` are original floats
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// and at least one of them is NaN. The returned NaN is guaranteed to comply with the NaN propagation
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// procedure: https://www.w3.org/TR/2022/WD-wasm-core-2-20220419/exec/numerics.html#nan-propagation
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func returnF32NaNBinOp(x, y float32) float32 {
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if f32IsNaN(x) {
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return math.Float32frombits(math.Float32bits(x) | F32CanonicalNaNBits)
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} else {
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return math.Float32frombits(math.Float32bits(y) | F32CanonicalNaNBits)
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}
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}
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