// Copyright 2010 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

#include "textflag.h"

// func archCeil(x float64) float64

TEXT ·archCeil(SB),NOSPLIT,$0

FMOVD x+0(FP), F0 // F0=x

FSTCW -2(SP) // save old Control Word

MOVW -2(SP), AX

ANDW $0xf3ff, AX

ORW $0x0800, AX // Rounding Control set to +Inf

MOVW AX, -4(SP) // store new Control Word

FLDCW -4(SP) // load new Control Word

FRNDINT // F0=Ceil(x)

FLDCW -2(SP) // load old Control Word

FMOVDP F0, ret+8(FP)

RET

// func archFloor(x float64) float64

TEXT ·archFloor(SB),NOSPLIT,$0

FMOVD x+0(FP), F0 // F0=x

FSTCW -2(SP) // save old Control Word

MOVW -2(SP), AX

ANDW $0xf3ff, AX

ORW $0x0400, AX // Rounding Control set to -Inf

MOVW AX, -4(SP) // store new Control Word

FLDCW -4(SP) // load new Control Word

FRNDINT // F0=Floor(x)

FLDCW -2(SP) // load old Control Word

FMOVDP F0, ret+8(FP)

RET

// func archTrunc(x float64) float64

TEXT ·archTrunc(SB),NOSPLIT,$0

FMOVD x+0(FP), F0 // F0=x

FSTCW -2(SP) // save old Control Word

MOVW -2(SP), AX

ORW $0x0c00, AX // Rounding Control set to truncate

MOVW AX, -4(SP) // store new Control Word

FLDCW -4(SP) // load new Control Word

FRNDINT // F0=Trunc(x)

FLDCW -2(SP) // load old Control Word

FMOVDP F0, ret+8(FP)

RET