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math: document sign bit correspondence for floating-point/bits conversions

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Fixes #27736.

Change-Id: Ibda7da7ec6e731626fc43abf3e8c1190117f7885
Reviewed-on: https://go-review.googlesource.com/c/153057
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2018-12-06 13:32:50 -08:00
parent 4a801cdd31
commit 276870d6e0
1 changed files with 14 additions and 6 deletions
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20
src/math/unsafe.go
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@ -6,16 +6,24 @@ package math
import "unsafe"
// Float32bits returns the IEEE 754 binary representation of f.
// 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.
// 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.
// 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
// the IEEE 754 binary representation b.
// 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)) }