dim_riscv64.s raw

   1  // Copyright 2020 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  // Values returned from an FCLASS instruction.
   8  #define	NegInf	0x001
   9  #define	PosInf	0x080
  10  #define	NaN	0x200
  11  
  12  // func archMax(x, y float64) float64
  13  TEXT ·archMax(SB),NOSPLIT,$0
  14  	MOVD	x+0(FP), F0
  15  	MOVD	y+8(FP), F1
  16  	FCLASSD	F0, X5
  17  	FCLASSD	F1, X6
  18  
  19  	// +Inf special cases
  20  	MOV	$PosInf, X7
  21  	BEQ	X7, X5, isMaxX
  22  	BEQ	X7, X6, isMaxY
  23  
  24  	// NaN special cases
  25  	MOV	$NaN, X7
  26  	BEQ	X7, X5, isMaxX
  27  	BEQ	X7, X6, isMaxY
  28  
  29  	// normal case
  30  	FMAXD	F0, F1, F0
  31  	MOVD	F0, ret+16(FP)
  32  	RET
  33  
  34  isMaxX: // return x
  35  	MOVD	F0, ret+16(FP)
  36  	RET
  37  
  38  isMaxY: // return y
  39  	MOVD	F1, ret+16(FP)
  40  	RET
  41  
  42  // func archMin(x, y float64) float64
  43  TEXT ·archMin(SB),NOSPLIT,$0
  44  	MOVD	x+0(FP), F0
  45  	MOVD	y+8(FP), F1
  46  	FCLASSD	F0, X5
  47  	FCLASSD	F1, X6
  48  
  49  	// -Inf special cases
  50  	MOV	$NegInf, X7
  51  	BEQ	X7, X5, isMinX
  52  	BEQ	X7, X6, isMinY
  53  
  54  	// NaN special cases
  55  	MOV	$NaN, X7
  56  	BEQ	X7, X5, isMinX
  57  	BEQ	X7, X6, isMinY
  58  
  59  	// normal case
  60  	FMIND	F0, F1, F0
  61  	MOVD	F0, ret+16(FP)
  62  	RET
  63  
  64  isMinX: // return x
  65  	MOVD	F0, ret+16(FP)
  66  	RET
  67  
  68  isMinY: // return y
  69  	MOVD	F1, ret+16(FP)
  70  	RET
  71