diff options
Diffstat (limited to 'src/runtime/malloc.go')
| -rw-r--r-- | src/runtime/malloc.go | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go index 86fdb3fdbb..ec4939f1dd 100644 --- a/src/runtime/malloc.go +++ b/src/runtime/malloc.go @@ -491,14 +491,13 @@ var zerobase uintptr // Otherwise it returns 0. func (c *mcache) nextFreeFast(sizeclass int8) gclinkptr { s := c.alloc[sizeclass] - ctzIndex := uint8(s.allocCache) - if ctzIndex != 0 { - theBit := uint64(ctzVals[ctzIndex]) - freeidx := s.freeindex // help the pre ssa compiler out here with cse. - result := freeidx + uintptr(theBit) + + theBit := sys.Ctz64(s.allocCache) // Is there a free object in the allocCache? + if theBit < 64 { + result := s.freeindex + uintptr(theBit) if result < s.nelems { s.allocCache >>= (theBit + 1) - freeidx = result + 1 + freeidx := result + 1 if freeidx%64 == 0 && freeidx != s.nelems { // We just incremented s.freeindex so it isn't 0 // so we are moving to the next aCache. |