| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package math |
| |
| import "unsafe" |
| |
| // Despite being an exported symbol, |
| // Float32bits is linknamed by widely used packages. |
| // Notable members of the hall of shame include: |
| // - gitee.com/quant1x/num |
| // |
| // Do not remove or change the type signature. |
| // See go.dev/issue/67401. |
| // |
| // Note that this comment is not part of the doc comment. |
| // |
| //go:linkname Float32bits |
| |
| // Float32bits returns the IEEE 754 binary representation of f, |
| // with the sign bit of f and the result in the same bit position. |
| // Float32bits(Float32frombits(x)) == x. |
| func Float32bits(f float32) uint32 { return *(*uint32)(unsafe.Pointer(&f)) } |
| |
| // Float32frombits returns the floating-point number corresponding |
| // to the IEEE 754 binary representation b, with the sign bit of b |
| // and the result in the same bit position. |
| // Float32frombits(Float32bits(x)) == x. |
| func Float32frombits(b uint32) float32 { return *(*float32)(unsafe.Pointer(&b)) } |
| |
| // Float64bits returns the IEEE 754 binary representation of f, |
| // with the sign bit of f and the result in the same bit position, |
| // and Float64bits(Float64frombits(x)) == x. |
| func Float64bits(f float64) uint64 { return *(*uint64)(unsafe.Pointer(&f)) } |
| |
| // Float64frombits returns the floating-point number corresponding |
| // to the IEEE 754 binary representation b, with the sign bit of b |
| // and the result in the same bit position. |
| // Float64frombits(Float64bits(x)) == x. |
| func Float64frombits(b uint64) float64 { return *(*float64)(unsafe.Pointer(&b)) } |