qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-24 15:20:03 -07:00
Code Releases Activity

Added a comment and some more tests

Browse Source
This commit is contained in:
Dmitry Panov 2022-12-28 22:55:02 +00:00
parent 9a6d4584a8
commit 3bfbd85c4c
2 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/math/all_test.go
View File

@ -1688,8 +1688,11 @@ var vfpowSC = [][2]float64{
{Nextafter(-1, 2), float64(1 << 63)},
{Nextafter(-1, -2), float64(1 << 63)},
// Issue #57465, exponent is an even number that overflows int64
// Issue #57465
{Copysign(0, -1), 1e19},
{Copysign(0, -1), -1e19},
{Copysign(0, -1), 1<<53 - 1},
{Copysign(0, -1), -(1<<53 - 1)},
}
var powSC = []float64{
0, // pow(-Inf, -Pi)
@ -1766,8 +1769,11 @@ var powSC = []float64{
0, // pow(Nextafter(-1, 2), float64(1 << 63))
Inf(1), // pow(Nextafter(-1, -2), float64(1 << 63))
// Issue #57465, exponent is an even number that overflows int64
0,
// Issue #57465
0, // pow(-0, 1e19)
Inf(1), // pow(-0, -1e19)
Copysign(0, -1), // pow(-0, 1<<53 -1)
Inf(-1), // pow(-0, -(1<<53 -1))
}
var vfpow10SC = []int{

5
src/math/pow.go
View File

@ -6,6 +6,11 @@ package math
func isOddInt(x float64) bool {
if Abs(x) >= (1 << 53) {
// 1 << 53 is the largest exact integer in the float64 format.
// Any number outside this range will be truncated before the decimal point and therefore will always be
// an even integer.
// Without this check and if x overflows int64 the int64(xi) conversion below may produce incorrect results
// on some architectures (and does so on arm64). See issue #57465.
return false
}