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cmd/compile: reduce reliance on implementation details of Mpint

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Change-Id: Ifdc41f6c77c83d22b9ad8811280f1e1db051c781
Reviewed-on: https://go-review.googlesource.com/39951
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Martin Möhrmann 2017-04-07 09:09:17 +02:00 • committed by Robert Griesemer
parent 63c1aff60b
commit ff3a4ef7ec
3 changed files with 13 additions and 8 deletions
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9
src/cmd/compile/internal/gc/const.go
View file

@ -309,8 +309,9 @@ func convlit1(n *Node, t *types.Type, explicit bool, reuse canReuseNode) *Node {
// if it is an unsafe.Pointer
case TUINTPTR:
if n.Type.Etype == TUNSAFEPTR {
n.SetVal(Val{new(Mpint)})
n.Val().U.(*Mpint).SetInt64(0)
i := new(Mpint)
i.SetInt64(0)
n.SetVal(Val{i})
} else {
goto bad
}
@ -458,7 +459,7 @@ func toint(v Val) Val {
case *Mpflt:
i := new(Mpint)
if !i.SetFloat(u) {
if i.Ovf {
if i.checkOverflow(0) {
yyerror("integer too large")
} else {
// The value of u cannot be represented as an integer;
@ -1518,7 +1519,7 @@ func nonnegintconst(n *Node) int64 {
// Mpint, so we still have to guard the conversion.
v := toint(n.Val())
vi, ok := v.U.(*Mpint)
if !ok || vi.Val.Sign() < 0 || vi.Cmp(maxintval[TINT32]) > 0 {
if !ok || vi.CmpInt64(0) < 0 || vi.Cmp(maxintval[TINT32]) > 0 {
return -1
}

2
src/cmd/compile/internal/gc/mpfloat.go
View file

@ -38,7 +38,7 @@ func newMpflt() *Mpflt {
}
func (a *Mpflt) SetInt(b *Mpint) {
if b.Ovf {
if b.checkOverflow(0) {
// sign doesn't really matter but copy anyway
a.Val.SetInf(b.Val.Sign() < 0)
return

10
src/cmd/compile/internal/gc/swt_test.go
View file

@ -5,16 +5,20 @@
package gc
import (
"math/big"
"testing"
)
func nodrune(r rune) *Node {
return nodlit(Val{&Mpint{Val: *big.NewInt(int64(r)), Rune: true}})
v := new(Mpint)
v.SetInt64(int64(r))
v.Rune = true
return nodlit(Val{v})
}
func nodflt(f float64) *Node {
return nodlit(Val{&Mpflt{Val: *big.NewFloat(f)}})
v := new(Mpflt)
v.SetFloat64(f)
return nodlit(Val{v})
}
func TestCaseClauseByConstVal(t *testing.T) {