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go.tools/go/types: extra tests for float conversions

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R=adonovan
CC=golang-dev
https://golang.org/cl/13393046
This commit is contained in:
Robert Griesemer 2013-09-10 14:43:23 -07:00
parent b591789053
commit 67c866ec74
2 changed files with 14 additions and 3 deletions
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5
go/types/expr.go
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@ -163,8 +163,9 @@ func fitsFloat32(x exact.Value) bool {
// the conversion succeeds but the result value is implementation-
// dependent."
//
// We assume that float32(f) returns an Inf if f cannot be represented
// as a float32, or if f is an Inf.
// We assume that float32(f) returns an Inf if f is too large for
// a float32, or if f is an Inf; and that it returns 0 for values
// with too small a magnitude.
return !math.IsInf(float64(float32(f)), 0)
}

12
go/types/testdata/const1.src vendored
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// implicit constant conversions
// constant conversions
package const1
@ -248,6 +248,11 @@ const (
_ = float32(-maxFloat32)
_ = float32(maxFloat32)
_ = float32(maxFloat32 /* ERROR "cannot convert" */ + delta32)
_ = assert(float32(smallestFloat32) == smallestFloat32)
_ = assert(float32(smallestFloat32/2) == 0)
_ = assert(float32(smallestFloat64) == 0)
_ = assert(float32(smallestFloat64/2) == 0)
)
const delta64 = maxFloat64/(1 << 52)
@ -262,6 +267,11 @@ const (
_ = float64(-maxFloat64)
_ = float64(maxFloat64)
_ = float64(maxFloat64 /* ERROR "cannot convert" */ + delta64)
_ = assert(float64(smallestFloat32) == smallestFloat32)
_ = assert(float64(smallestFloat32/2) == smallestFloat32/2)
_ = assert(float64(smallestFloat64) == smallestFloat64)
_ = assert(float64(smallestFloat64/2) == 0)
)
const (