// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// func Ceil(x float64) float64
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TEXT ·Ceil(SB),NOSPLIT,$0
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FMOVD x+0(FP), F0 // F0=x
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FSTCW -2(SP) // save old Control Word
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MOVW -2(SP), AX
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ANDW $0xf3ff, AX
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ORW $0x0800, AX // Rounding Control set to +Inf
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MOVW AX, -4(SP) // store new Control Word
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FLDCW -4(SP) // load new Control Word
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FRNDINT // F0=Ceil(x)
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FLDCW -2(SP) // load old Control Word
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FMOVDP F0, ret+8(FP)
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RET
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// func Floor(x float64) float64
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TEXT ·Floor(SB),NOSPLIT,$0
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FMOVD x+0(FP), F0 // F0=x
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FSTCW -2(SP) // save old Control Word
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MOVW -2(SP), AX
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ANDW $0xf3ff, AX
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ORW $0x0400, AX // Rounding Control set to -Inf
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MOVW AX, -4(SP) // store new Control Word
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FLDCW -4(SP) // load new Control Word
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FRNDINT // F0=Floor(x)
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FLDCW -2(SP) // load old Control Word
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FMOVDP F0, ret+8(FP)
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RET
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// func Trunc(x float64) float64
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TEXT ·Trunc(SB),NOSPLIT,$0
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FMOVD x+0(FP), F0 // F0=x
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FSTCW -2(SP) // save old Control Word
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MOVW -2(SP), AX
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ORW $0x0c00, AX // Rounding Control set to truncate
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MOVW AX, -4(SP) // store new Control Word
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FLDCW -4(SP) // load new Control Word
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FRNDINT // F0=Trunc(x)
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FLDCW -2(SP) // load old Control Word
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FMOVDP F0, ret+8(FP)
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RET
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