diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/runtime/mgcmark_greenteagc.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/runtime/mgcmark_greenteagc.go b/src/runtime/mgcmark_greenteagc.go index 6af711108f..a2f28e95d2 100644 --- a/src/runtime/mgcmark_greenteagc.go +++ b/src/runtime/mgcmark_greenteagc.go @@ -132,7 +132,11 @@ func (imb *spanInlineMarkBits) init(class spanClass, needzero bool) { throw("runtime: span inline mark bits nil?") } if needzero { - *imb = spanInlineMarkBits{} + // Use memclrNoHeapPointers to avoid having the compiler make a worse + // decision. We know that imb is both aligned and a nice power-of-two + // size that works well for wider SIMD instructions. The compiler likely + // has no idea that imb is aligned to 128 bytes. + memclrNoHeapPointers(unsafe.Pointer(imb), unsafe.Sizeof(spanInlineMarkBits{})) } imb.class = class } |