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Diffstat (limited to 'src/cmd/compile/internal/gc/const.go')
| -rw-r--r-- | src/cmd/compile/internal/gc/const.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/gc/const.go b/src/cmd/compile/internal/gc/const.go index dcc16b6dec..32af1fb3fa 100644 --- a/src/cmd/compile/internal/gc/const.go +++ b/src/cmd/compile/internal/gc/const.go @@ -122,6 +122,17 @@ func (n *Node) Int64() int64 { return n.Val().U.(*Mpint).Int64() } +// CanInt64 reports whether it is safe to call Int64() on n. +func (n *Node) CanInt64() bool { + if !Isconst(n, CTINT) { + return false + } + + // if the value inside n cannot be represented as an int64, the + // return value of Int64 is undefined + return n.Val().U.(*Mpint).CmpInt64(n.Int64()) == 0 +} + // Bool returns n as a bool. // n must be a boolean constant. func (n *Node) Bool() bool { |