// Copyright 2024 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 PosInf 0x7FF0000000000000

#define NaN 0x7FF8000000000001

#define NegInf 0xFFF0000000000000

TEXT ·archMax(SB),NOSPLIT,$0

MOVD x+0(FP), F0

MOVD y+8(FP), F1

FCLASSD F0, F2

FCLASSD F1, F3

// combine x and y categories together to judge

MOVV F2, R4

MOVV F3, R5

OR R5, R4

// +Inf special cases

AND $64, R4, R5

BNE R5, isPosInf

// NaN special cases

AND $2, R4, R5

BNE R5, isMaxNaN

// normal case

FMAXD F0, F1, F0

MOVD F0, ret+16(FP)

RET

isMaxNaN:

MOVV $NaN, R6

MOVV R6, ret+16(FP)

RET

isPosInf:

MOVV $PosInf, R6

MOVV R6, ret+16(FP)

RET

TEXT ·archMin(SB),NOSPLIT,$0

MOVD x+0(FP), F0

MOVD y+8(FP), F1

FCLASSD F0, F2

FCLASSD F1, F3

// combine x and y categories together to judge

MOVV F2, R4

MOVV F3, R5

OR R5, R4

// -Inf special cases

AND $4, R4, R5

BNE R5, isNegInf

// NaN special cases

AND $2, R4, R5

BNE R5, isMinNaN

// normal case

FMIND F0, F1, F0

MOVD F0, ret+16(FP)

RET

isMinNaN:

MOVV $NaN, R6

MOVV R6, ret+16(FP)

RET

isNegInf:

MOVV $NegInf, R6

MOVV R6, ret+16(FP)

RET