From: Russ Cox <rsc@golang.org>
Date: Mon, 13 Dec 2010 15:04:53 +0000 (-0500)
Subject: runtime/linux/386: set FPU to 64-bit precision
X-Git-Tag: weekly.2010-12-15~49
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=cc1556d9a29865f1cce8d0ee516b6116bae3ca54;p=gostls13.git

runtime/linux/386: set FPU to 64-bit precision

Fixes #550.

R=r
CC=golang-dev
https://golang.org/cl/3469044
---

diff --git a/src/pkg/runtime/linux/386/rt0.s b/src/pkg/runtime/linux/386/rt0.s
index 223e6d2ea4..0f82d6a1c7 100644
--- a/src/pkg/runtime/linux/386/rt0.s
+++ b/src/pkg/runtime/linux/386/rt0.s
@@ -5,5 +5,13 @@
 // Darwin and Linux use the same linkage to main
 
 TEXT _rt0_386_linux(SB),7,$0
+	// Linux starts the FPU in extended double precision.
+	// Other operating systems use double precision.
+	// Change to double precision to match them,
+	// and to match other hardware that only has double.
+	PUSHL $0x27F
+	FLDCW	0(SP)
+	POPL AX
+
 	JMP	_rt0_386(SB)