From 340a4f55c4afac5b74c8df8365decb0c0237d710 Mon Sep 17 00:00:00 2001
From: Cherry Mui <cherryyz@google.com>
Date: Wed, 16 Nov 2022 17:32:08 -0500
Subject: runtime: use smaller fields for mspan.freeindex and nelems

mspan.freeindex and nelems can fit into uint16 for all possible
values. Use uint16 instead of uintptr.

Change-Id: Ifce20751e81d5022be1f6b5cbb5fbe4fd1728b1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/451359
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---
 src/runtime/export_test.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/runtime/export_test.go')

diff --git a/src/runtime/export_test.go b/src/runtime/export_test.go
index 6376445110..f81e8a9ea1 100644
--- a/src/runtime/export_test.go
+++ b/src/runtime/export_test.go
@@ -1372,7 +1372,7 @@ func FreeMSpan(s *MSpan) {
 
 func MSpanCountAlloc(ms *MSpan, bits []byte) int {
 	s := (*mspan)(ms)
-	s.nelems = uintptr(len(bits) * 8)
+	s.nelems = uint16(len(bits) * 8)
 	s.gcmarkBits = (*gcBits)(unsafe.Pointer(&bits[0]))
 	result := s.countAlloc()
 	s.gcmarkBits = nil
-- 
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