From 2f2e8f9c81d899d8eefb1f2f98ce5c90976c4f61 Mon Sep 17 00:00:00 2001
From: Josh Bleecher Snyder <josharian@gmail.com>
Date: Mon, 30 Apr 2018 23:05:41 -0700
Subject: [PATCH] runtime: use staticbytes in intstring for small v
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Triggers 21 times during make.bash.

Change-Id: I7efb34200439256151304bb66cd309913f7c9c9e
Reviewed-on: https://go-review.googlesource.com/110557
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
 src/runtime/string.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/runtime/string.go b/src/runtime/string.go
index 31518aed70..6e42483b13 100644
--- a/src/runtime/string.go
+++ b/src/runtime/string.go
@@ -229,8 +229,13 @@ func stringStructOf(sp *string) *stringStruct {
 	return (*stringStruct)(unsafe.Pointer(sp))
 }
 
-func intstring(buf *[4]byte, v int64) string {
-	var s string
+func intstring(buf *[4]byte, v int64) (s string) {
+	if v >= 0 && v < runeSelf {
+		stringStructOf(&s).str = unsafe.Pointer(&staticbytes[v])
+		stringStructOf(&s).len = 1
+		return
+	}
+
 	var b []byte
 	if buf != nil {
 		b = buf[:]
-- 
2.50.0