1// Copyright 2010 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include "textflag.h"
6
7// func archCeil(x float64) float64
8TEXT ·archCeil(SB),NOSPLIT,$0
9	FMOVD   x+0(FP), F0  // F0=x
10	FSTCW   -2(SP)       // save old Control Word
11	MOVW    -2(SP), AX
12	ANDW    $0xf3ff, AX
13	ORW     $0x0800, AX  // Rounding Control set to +Inf
14	MOVW    AX, -4(SP)   // store new Control Word
15	FLDCW   -4(SP)       // load new Control Word
16	FRNDINT              // F0=Ceil(x)
17	FLDCW   -2(SP)       // load old Control Word
18	FMOVDP  F0, ret+8(FP)
19	RET
20
21// func archFloor(x float64) float64
22TEXT ·archFloor(SB),NOSPLIT,$0
23	FMOVD   x+0(FP), F0  // F0=x
24	FSTCW   -2(SP)       // save old Control Word
25	MOVW    -2(SP), AX
26	ANDW    $0xf3ff, AX
27	ORW     $0x0400, AX  // Rounding Control set to -Inf
28	MOVW    AX, -4(SP)   // store new Control Word
29	FLDCW   -4(SP)       // load new Control Word
30	FRNDINT              // F0=Floor(x)
31	FLDCW   -2(SP)       // load old Control Word
32	FMOVDP  F0, ret+8(FP)
33	RET
34
35// func archTrunc(x float64) float64
36TEXT ·archTrunc(SB),NOSPLIT,$0
37	FMOVD   x+0(FP), F0  // F0=x
38	FSTCW   -2(SP)       // save old Control Word
39	MOVW    -2(SP), AX
40	ORW     $0x0c00, AX  // Rounding Control set to truncate
41	MOVW    AX, -4(SP)   // store new Control Word
42	FLDCW   -4(SP)       // load new Control Word
43	FRNDINT              // F0=Trunc(x)
44	FLDCW   -2(SP)       // load old Control Word
45	FMOVDP  F0, ret+8(FP)
46	RET
47