mirror of
https://github.com/golang/go
synced 2024-11-19 15:24:46 -07:00
c007ce824d
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
77 lines
2.0 KiB
ArmAsm
77 lines
2.0 KiB
ArmAsm
// Copyright 2012 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"
|
|
|
|
#define Big 0x4330000000000000 // 2**52
|
|
|
|
// func Floor(x float64) float64
|
|
TEXT ·Floor(SB),NOSPLIT,$0
|
|
MOVQ x+0(FP), AX
|
|
MOVQ $~(1<<63), DX // sign bit mask
|
|
ANDQ AX,DX // DX = |x|
|
|
SUBQ $1,DX
|
|
MOVQ $(Big - 1), CX // if |x| >= 2**52-1 or IsNaN(x) or |x| == 0, return x
|
|
CMPQ DX,CX
|
|
JAE isBig_floor
|
|
MOVQ AX, X0 // X0 = x
|
|
CVTTSD2SQ X0, AX
|
|
CVTSQ2SD AX, X1 // X1 = float(int(x))
|
|
CMPSD X1, X0, 1 // compare LT; X0 = 0xffffffffffffffff or 0
|
|
MOVSD $(-1.0), X2
|
|
ANDPD X2, X0 // if x < float(int(x)) {X0 = -1} else {X0 = 0}
|
|
ADDSD X1, X0
|
|
MOVSD X0, ret+8(FP)
|
|
RET
|
|
isBig_floor:
|
|
MOVQ AX, ret+8(FP) // return x
|
|
RET
|
|
|
|
// func Ceil(x float64) float64
|
|
TEXT ·Ceil(SB),NOSPLIT,$0
|
|
MOVQ x+0(FP), AX
|
|
MOVQ $~(1<<63), DX // sign bit mask
|
|
MOVQ AX, BX // BX = copy of x
|
|
ANDQ DX, BX // BX = |x|
|
|
MOVQ $Big, CX // if |x| >= 2**52 or IsNaN(x), return x
|
|
CMPQ BX, CX
|
|
JAE isBig_ceil
|
|
MOVQ AX, X0 // X0 = x
|
|
MOVQ DX, X2 // X2 = sign bit mask
|
|
CVTTSD2SQ X0, AX
|
|
ANDNPD X0, X2 // X2 = sign
|
|
CVTSQ2SD AX, X1 // X1 = float(int(x))
|
|
CMPSD X1, X0, 2 // compare LE; X0 = 0xffffffffffffffff or 0
|
|
ORPD X2, X1 // if X1 = 0.0, incorporate sign
|
|
MOVSD $1.0, X3
|
|
ANDNPD X3, X0
|
|
ORPD X2, X0 // if float(int(x)) <= x {X0 = 1} else {X0 = -0}
|
|
ADDSD X1, X0
|
|
MOVSD X0, ret+8(FP)
|
|
RET
|
|
isBig_ceil:
|
|
MOVQ AX, ret+8(FP)
|
|
RET
|
|
|
|
// func Trunc(x float64) float64
|
|
TEXT ·Trunc(SB),NOSPLIT,$0
|
|
MOVQ x+0(FP), AX
|
|
MOVQ $~(1<<63), DX // sign bit mask
|
|
MOVQ AX, BX // BX = copy of x
|
|
ANDQ DX, BX // BX = |x|
|
|
MOVQ $Big, CX // if |x| >= 2**52 or IsNaN(x), return x
|
|
CMPQ BX, CX
|
|
JAE isBig_trunc
|
|
MOVQ AX, X0
|
|
MOVQ DX, X2 // X2 = sign bit mask
|
|
CVTTSD2SQ X0, AX
|
|
ANDNPD X0, X2 // X2 = sign
|
|
CVTSQ2SD AX, X0 // X0 = float(int(x))
|
|
ORPD X2, X0 // if X0 = 0.0, incorporate sign
|
|
MOVSD X0, ret+8(FP)
|
|
RET
|
|
isBig_trunc:
|
|
MOVQ AX, ret+8(FP) // return x
|
|
RET
|