diff options
| author | Michael Pratt <mpratt@google.com> | 2024-08-21 16:17:16 -0400 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2024-10-28 21:25:50 +0000 |
| commit | cd54b9bae94b36f67869ef174cbb432bc4012183 (patch) | |
| tree | 95771c1b1e79fb4650dc144d3dae56bdf803ea31 /src/cmd/compile/internal/reflectdata | |
| parent | 775837f51f03245bcba333094b4b3742f8fbfca3 (diff) | |
| download | go-cd54b9bae94b36f67869ef174cbb432bc4012183.tar.xz | |
internal/runtime/maps: shift optimizations
Masking the shift lets the compiler elide a few instructions for
handling a shift of > 63 bits.
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-swissmap
Change-Id: I669fe01caa1de1b8521f1f56b6906f3e9066a39b
Reviewed-on: https://go-review.googlesource.com/c/go/+/611190
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Diffstat (limited to 'src/cmd/compile/internal/reflectdata')
| -rw-r--r-- | src/cmd/compile/internal/reflectdata/map_swiss.go | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/reflectdata/map_swiss.go b/src/cmd/compile/internal/reflectdata/map_swiss.go index a76864bdff..38a23908a6 100644 --- a/src/cmd/compile/internal/reflectdata/map_swiss.go +++ b/src/cmd/compile/internal/reflectdata/map_swiss.go @@ -148,6 +148,7 @@ func SwissMapType() *types.Type { // dirLen int // // globalDepth uint8 + // globalShift uint8 // // N.B Padding // // clearSeq uint64 @@ -160,6 +161,7 @@ func SwissMapType() *types.Type { makefield("dirPtr", types.Types[types.TUNSAFEPTR]), makefield("dirLen", types.Types[types.TINT]), makefield("globalDepth", types.Types[types.TUINT8]), + makefield("globalShift", types.Types[types.TUINT8]), makefield("clearSeq", types.Types[types.TUINT64]), } |