From: Keith Randall <khr@golang.org>
Date: Fri, 28 Feb 2020 23:42:03 +0000 (-0800)
Subject: runtime: use quiet NaNs in softfloat implementation
X-Git-Tag: go1.15beta1~970
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d8bf079751cbdbebe8425be7c93b963dc0f31360;p=gostls13.git

runtime: use quiet NaNs in softfloat implementation

Update #37455

Change-Id: Ieac0823aa398d73187c009037be15ba34c84f3d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/221433
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
---

diff --git a/src/runtime/softfloat64.go b/src/runtime/softfloat64.go
index 8fde0feddc..13bee6c1d7 100644
--- a/src/runtime/softfloat64.go
+++ b/src/runtime/softfloat64.go
@@ -13,7 +13,7 @@ const (
 	expbits64  uint = 11
 	bias64          = -1<<(expbits64-1) + 1
 
-	nan64 uint64 = (1<<expbits64-1)<<mantbits64 + 1
+	nan64 uint64 = (1<<expbits64-1)<<mantbits64 + 1<<(mantbits64-1) // quiet NaN, 0 payload
 	inf64 uint64 = (1<<expbits64 - 1) << mantbits64
 	neg64 uint64 = 1 << (expbits64 + mantbits64)
 
@@ -21,7 +21,7 @@ const (
 	expbits32  uint = 8
 	bias32          = -1<<(expbits32-1) + 1
 
-	nan32 uint32 = (1<<expbits32-1)<<mantbits32 + 1
+	nan32 uint32 = (1<<expbits32-1)<<mantbits32 + 1<<(mantbits32-1) // quiet NaN, 0 payload
 	inf32 uint32 = (1<<expbits32 - 1) << mantbits32
 	neg32 uint32 = 1 << (expbits32 + mantbits32)
 )