diff --git a/src/pkg/math/fltasm_amd64.s b/src/pkg/math/fltasm_amd64.s
deleted file mode 100644
index 3e8bae5e20d..00000000000
--- a/src/pkg/math/fltasm_amd64.s
+++ /dev/null
@@ -1,69 +0,0 @@
-// Derived from Inferno's libkern/getfcr-amd64.s
-// http://code.google.com/p/inferno-os/source/browse/libkern/getfcr-amd64.s
-//
-//         Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
-//         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
-//         Portions Copyright 2009 The Go Authors. All rights reserved.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-#include "../../cmd/ld/textflag.h"
-
-TEXT	·SetFPControl(SB), NOSPLIT, $8
-	// Set new
-	MOVL	p+0(FP), DI
-	XORL	$(0x3F<<7), DI
-	ANDL	$0xFFC0, DI
-	WAIT
-	STMXCSR	0(SP)
-	MOVL	0(SP), AX
-	ANDL	$~0x3F, AX
-	ORL	DI, AX
-	MOVL	AX, 0(SP)
-	LDMXCSR	0(SP)
-	RET
-
-TEXT	·GetFPControl(SB), NOSPLIT, $0
-	WAIT
-	STMXCSR	0(SP)
-	MOVWLZX	0(SP), AX
-	ANDL	$0xFFC0, AX
-	XORL	$(0x3F<<7), AX
-	MOVL	AX, ret+0(FP)
-	RET
-
-TEXT	·SetFPStatus(SB), $0
-	MOVL	p+0(FP), DI
-	ANDL	$0x3F, DI
-	WAIT
-	STMXCSR	0(SP)
-	MOVL	0(SP), AX
-	ANDL	$~0x3F, AX
-	ORL	DI, AX
-	MOVL	AX, 0(SP)
-	LDMXCSR	0(SP)
-	RET
-
-TEXT	·GetFPStatus(SB), $0
-	WAIT
-	STMXCSR	0(SP)
-	MOVL	0(SP), AX
-	ANDL	$0x3F, AX
-	MOVL	AX, ret+0(FP)
-	RET