diff options
Diffstat (limited to 'libgo/go/runtime/mcentral.go')
| -rw-r--r-- | libgo/go/runtime/mcentral.go | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libgo/go/runtime/mcentral.go b/libgo/go/runtime/mcentral.go index a60eb9f..cd59010 100644 --- a/libgo/go/runtime/mcentral.go +++ b/libgo/go/runtime/mcentral.go @@ -251,16 +251,16 @@ func (c *mcentral) freeSpan(s *mspan, preserve bool, wasempty bool) bool { func (c *mcentral) grow() *mspan { npages := uintptr(class_to_allocnpages[c.spanclass.sizeclass()]) size := uintptr(class_to_size[c.spanclass.sizeclass()]) - n := (npages << _PageShift) / size s := mheap_.alloc(npages, c.spanclass, false, true) if s == nil { return nil } - p := s.base() - s.limit = p + size*n - + // Use division by multiplication and shifts to quickly compute: + // n := (npages << _PageShift) / size + n := (npages << _PageShift) >> s.divShift * uintptr(s.divMul) >> s.divShift2 + s.limit = s.base() + size*n heapBitsForAddr(s.base()).initSpan(s) return s } |