From: Michael Pratt <mpratt@google.com>
Date: Wed, 9 Oct 2024 16:03:33 +0000 (-0400)
Subject: internal/runtime/maps: support big endian architectures
X-Git-Tag: go1.24rc1~720
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=3352db152b8347650e1fd3c9f26c335586577b21;p=gostls13.git

internal/runtime/maps: support big endian architectures

For #54766.

Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10
Change-Id: I0a928c4b1e90056c50d2abca8982bdb540c33a34
Reviewed-on: https://go-review.googlesource.com/c/go/+/619035
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
---

diff --git a/src/internal/runtime/maps/group.go b/src/internal/runtime/maps/group.go
index d6e06300ab..822e3773ea 100644
--- a/src/internal/runtime/maps/group.go
+++ b/src/internal/runtime/maps/group.go
@@ -5,6 +5,7 @@
 package maps
 
 import (
+	"internal/goarch"
 	"internal/runtime/maps/internal/abi"
 	"internal/runtime/sys"
 	"unsafe"
@@ -64,11 +65,18 @@ type ctrlGroup uint64
 
 // get returns the i-th control byte.
 func (g *ctrlGroup) get(i uint32) ctrl {
+	if goarch.BigEndian {
+		return *(*ctrl)(unsafe.Add(unsafe.Pointer(g), 7-i))
+	}
 	return *(*ctrl)(unsafe.Add(unsafe.Pointer(g), i))
 }
 
 // set sets the i-th control byte.
 func (g *ctrlGroup) set(i uint32, c ctrl) {
+	if goarch.BigEndian {
+		*(*ctrl)(unsafe.Add(unsafe.Pointer(g), 7-i)) = c
+		return
+	}
 	*(*ctrl)(unsafe.Add(unsafe.Pointer(g), i)) = c
 }