From e0807ba470e6cfdc6dbc285a76216fab20cb0589 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Wed, 5 Nov 2025 20:32:38 -0800
Subject: [PATCH] cmd/compile: don't clear ptrmask in fillptrmask

It is only ever called with a newly allocated slice.

This clearing code dates back to the C version of the compiler,
in which the function started like this:

static void
gengcmask(Type *t, uint8 gcmask[16])
{
	...

	memset(gcmask, 0, 16);
	if(!haspointers(t))
		return;

That memset was required for C, but not for Go.

Change-Id: I6fceb99b2dc8682685dca2e4289fcd58e2e5a0e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/718340
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
---
 src/cmd/compile/internal/reflectdata/reflect.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/cmd/compile/internal/reflectdata/reflect.go b/src/cmd/compile/internal/reflectdata/reflect.go
index 38b9391c5f1..324007ea798 100644
--- a/src/cmd/compile/internal/reflectdata/reflect.go
+++ b/src/cmd/compile/internal/reflectdata/reflect.go
@@ -1282,7 +1282,6 @@ func dgcptrmask(t *types.Type, write bool) *obj.LSym {
 // word offsets in t that hold pointers.
 // ptrmask is assumed to fit at least types.PtrDataSize(t)/PtrSize bits.
 func fillptrmask(t *types.Type, ptrmask []byte) {
-	clear(ptrmask)
 	if !t.HasPointers() {
 		return
 	}