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| author | Austin Clements <austin@google.com> | 2020-03-20 11:37:54 -0400 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2020-03-20 16:05:35 +0000 |
| commit | d965bb613086cd780cf73418bcdeaef50a9afc55 (patch) | |
| tree | d57632acdcb73de11dafae0b3db55d58fd9cb2ae /src/runtime | |
| parent | ab5a40c5e3162a565b26de4b1e7595f7922ba761 (diff) | |
| download | go-d965bb613086cd780cf73418bcdeaef50a9afc55.tar.xz | |
runtime: use divRoundUp
There are a handful of places where the runtime wants to round up the
result of a division. We just introduced a helper to do this. This CL
replaces all of the hand-coded round-ups (that I could find) with this
helper.
Change-Id: I465d152157ff0f3cad40c0aa57491e4f2de510ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/224385
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/malloc.go | 4 | ||||
| -rw-r--r-- | src/runtime/mgcmark.go | 2 | ||||
| -rw-r--r-- | src/runtime/mgcsweepbuf.go | 2 | ||||
| -rw-r--r-- | src/runtime/msize.go | 4 |
4 files changed, 6 insertions, 6 deletions
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go index 483ea0aee5..346d7f4742 100644 --- a/src/runtime/malloc.go +++ b/src/runtime/malloc.go @@ -1035,9 +1035,9 @@ func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer { } else { var sizeclass uint8 if size <= smallSizeMax-8 { - sizeclass = size_to_class8[(size+smallSizeDiv-1)/smallSizeDiv] + sizeclass = size_to_class8[divRoundUp(size, smallSizeDiv)] } else { - sizeclass = size_to_class128[(size-smallSizeMax+largeSizeDiv-1)/largeSizeDiv] + sizeclass = size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)] } size = uintptr(class_to_size[sizeclass]) spc := makeSpanClass(sizeclass, noscan) diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go index 2c17d8befa..301d8020f1 100644 --- a/src/runtime/mgcmark.go +++ b/src/runtime/mgcmark.go @@ -54,7 +54,7 @@ func gcMarkRootPrepare() { // Compute how many data and BSS root blocks there are. nBlocks := func(bytes uintptr) int { - return int((bytes + rootBlockBytes - 1) / rootBlockBytes) + return int(divRoundUp(bytes, rootBlockBytes)) } work.nDataRoots = 0 diff --git a/src/runtime/mgcsweepbuf.go b/src/runtime/mgcsweepbuf.go index 78288229c8..1f722c3d58 100644 --- a/src/runtime/mgcsweepbuf.go +++ b/src/runtime/mgcsweepbuf.go @@ -144,7 +144,7 @@ func (b *gcSweepBuf) pop() *mspan { // intervening pops. Spans that are pushed after the call may also // appear in these blocks. func (b *gcSweepBuf) numBlocks() int { - return int((atomic.Load(&b.index) + gcSweepBlockEntries - 1) / gcSweepBlockEntries) + return int(divRoundUp(uintptr(atomic.Load(&b.index)), gcSweepBlockEntries)) } // block returns the spans in the i'th block of buffer b. block is diff --git a/src/runtime/msize.go b/src/runtime/msize.go index 11d06ce025..c56aa5a7b2 100644 --- a/src/runtime/msize.go +++ b/src/runtime/msize.go @@ -13,9 +13,9 @@ package runtime func roundupsize(size uintptr) uintptr { if size < _MaxSmallSize { if size <= smallSizeMax-8 { - return uintptr(class_to_size[size_to_class8[(size+smallSizeDiv-1)/smallSizeDiv]]) + return uintptr(class_to_size[size_to_class8[divRoundUp(size, smallSizeDiv)]]) } else { - return uintptr(class_to_size[size_to_class128[(size-smallSizeMax+largeSizeDiv-1)/largeSizeDiv]]) + return uintptr(class_to_size[size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]]) } } if size+_PageSize < size { |