From 094048b93845c08e0f2db8639764f9564e64835b Mon Sep 17 00:00:00 2001
From: cui <cuiweixie@gmail.com>
Date: Thu, 18 Feb 2021 17:51:24 +0000
Subject: [PATCH] cmd/compile/internal: loop opt

Change-Id: I5fe767237b8046934e9b0f33bd3dafabdb727dd6
GitHub-Last-Rev: 94fea3d57279e8b2d62f7f6be4301698dc8841e3
GitHub-Pull-Request: golang/go#44384
Reviewed-on: https://go-review.googlesource.com/c/go/+/293809
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
---
 src/cmd/compile/internal/types/size.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/cmd/compile/internal/types/size.go b/src/cmd/compile/internal/types/size.go
index d1203e4a21..799cf3a1f6 100644
--- a/src/cmd/compile/internal/types/size.go
+++ b/src/cmd/compile/internal/types/size.go
@@ -624,9 +624,11 @@ func PtrDataSize(t *Type) int64 {
 	case TSTRUCT:
 		// Find the last field that has pointers.
 		var lastPtrField *Field
-		for _, t1 := range t.Fields().Slice() {
-			if t1.Type.HasPointers() {
-				lastPtrField = t1
+		fs := t.Fields().Slice()
+		for i := len(fs) - 1; i >= 0; i-- {
+			if fs[i].Type.HasPointers() {
+				lastPtrField = fs[i]
+				break
 			}
 		}
 		return lastPtrField.Offset + PtrDataSize(lastPtrField.Type)
-- 
2.50.0