xref: /openbmc/linux/arch/arm/nwfpe/single_cpdo.c (revision 74ba9207)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3     NetWinder Floating Point Emulator
4     (c) Rebel.COM, 1998,1999
5     (c) Philip Blundell, 2001
6 
7     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
8 
9 */
10 
11 #include "fpa11.h"
12 #include "softfloat.h"
13 #include "fpopcode.h"
14 
15 float32 float32_exp(float32 Fm);
16 float32 float32_ln(float32 Fm);
17 float32 float32_sin(float32 rFm);
18 float32 float32_cos(float32 rFm);
19 float32 float32_arcsin(float32 rFm);
20 float32 float32_arctan(float32 rFm);
21 float32 float32_log(float32 rFm);
22 float32 float32_tan(float32 rFm);
23 float32 float32_arccos(float32 rFm);
24 float32 float32_pow(float32 rFn, float32 rFm);
25 float32 float32_pol(float32 rFn, float32 rFm);
26 
float32_rsf(struct roundingData * roundData,float32 rFn,float32 rFm)27 static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm)
28 {
29 	return float32_sub(roundData, rFm, rFn);
30 }
31 
float32_rdv(struct roundingData * roundData,float32 rFn,float32 rFm)32 static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm)
33 {
34 	return float32_div(roundData, rFm, rFn);
35 }
36 
37 static float32 (*const dyadic_single[16])(struct roundingData *, float32 rFn, float32 rFm) = {
38 	[ADF_CODE >> 20] = float32_add,
39 	[MUF_CODE >> 20] = float32_mul,
40 	[SUF_CODE >> 20] = float32_sub,
41 	[RSF_CODE >> 20] = float32_rsf,
42 	[DVF_CODE >> 20] = float32_div,
43 	[RDF_CODE >> 20] = float32_rdv,
44 	[RMF_CODE >> 20] = float32_rem,
45 
46 	[FML_CODE >> 20] = float32_mul,
47 	[FDV_CODE >> 20] = float32_div,
48 	[FRD_CODE >> 20] = float32_rdv,
49 };
50 
float32_mvf(struct roundingData * roundData,float32 rFm)51 static float32 float32_mvf(struct roundingData *roundData, float32 rFm)
52 {
53 	return rFm;
54 }
55 
float32_mnf(struct roundingData * roundData,float32 rFm)56 static float32 float32_mnf(struct roundingData *roundData, float32 rFm)
57 {
58 	return rFm ^ 0x80000000;
59 }
60 
float32_abs(struct roundingData * roundData,float32 rFm)61 static float32 float32_abs(struct roundingData *roundData, float32 rFm)
62 {
63 	return rFm & 0x7fffffff;
64 }
65 
66 static float32 (*const monadic_single[16])(struct roundingData*, float32 rFm) = {
67 	[MVF_CODE >> 20] = float32_mvf,
68 	[MNF_CODE >> 20] = float32_mnf,
69 	[ABS_CODE >> 20] = float32_abs,
70 	[RND_CODE >> 20] = float32_round_to_int,
71 	[URD_CODE >> 20] = float32_round_to_int,
72 	[SQT_CODE >> 20] = float32_sqrt,
73 	[NRM_CODE >> 20] = float32_mvf,
74 };
75 
SingleCPDO(struct roundingData * roundData,const unsigned int opcode,FPREG * rFd)76 unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
77 {
78 	FPA11 *fpa11 = GET_FPA11();
79 	float32 rFm;
80 	unsigned int Fm, opc_mask_shift;
81 
82 	Fm = getFm(opcode);
83 	if (CONSTANT_FM(opcode)) {
84 		rFm = getSingleConstant(Fm);
85 	} else if (fpa11->fType[Fm] == typeSingle) {
86 		rFm = fpa11->fpreg[Fm].fSingle;
87 	} else {
88 		return 0;
89 	}
90 
91 	opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
92 	if (!MONADIC_INSTRUCTION(opcode)) {
93 		unsigned int Fn = getFn(opcode);
94 		float32 rFn;
95 
96 		if (fpa11->fType[Fn] == typeSingle &&
97 		    dyadic_single[opc_mask_shift]) {
98 			rFn = fpa11->fpreg[Fn].fSingle;
99 			rFd->fSingle = dyadic_single[opc_mask_shift](roundData, rFn, rFm);
100 		} else {
101 			return 0;
102 		}
103 	} else {
104 		if (monadic_single[opc_mask_shift]) {
105 			rFd->fSingle = monadic_single[opc_mask_shift](roundData, rFm);
106 		} else {
107 			return 0;
108 		}
109 	}
110 
111 	return 1;
112 }
113