diff options
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/mbitmap.go | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go index 7d528b94b4..f9a4c4ce3d 100644 --- a/src/runtime/mbitmap.go +++ b/src/runtime/mbitmap.go @@ -219,8 +219,13 @@ func (tp typePointers) nextFast() (typePointers, uintptr) { } else { i = sys.TrailingZeros32(uint32(tp.mask)) } - // BTCQ - tp.mask ^= uintptr(1) << (i & (ptrBits - 1)) + if GOARCH == "amd64" { + // BTCQ + tp.mask ^= uintptr(1) << (i & (ptrBits - 1)) + } else { + // SUB, AND + tp.mask &= tp.mask - 1 + } // LEAQ (XX)(XX*8) return tp, tp.addr + uintptr(i)*goarch.PtrSize } |