1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// Copyright 2018 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstring>
#include <vector>
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
#include "Common/FloatUtils.h"
#include "Common/x64ABI.h"
#include "Core/PowerPC/Gekko.h"
#include "Core/PowerPC/Jit64/Jit.h"
#include "Core/PowerPC/Jit64Common/Jit64AsmCommon.h"
#include "Core/PowerPC/Jit64Common/Jit64PowerPCState.h"
#include <gtest/gtest.h>
namespace
{
class TestCommonAsmRoutines : public CommonAsmRoutines
{
public:
TestCommonAsmRoutines() : CommonAsmRoutines(jit)
{
using namespace Gen;
AllocCodeSpace(4096);
m_const_pool.Init(AllocChildCodeSpace(1024), 1024);
const auto raw_frsqrte = reinterpret_cast<double (*)(double)>(AlignCode4());
GenFrsqrte();
wrapped_frsqrte = reinterpret_cast<u64 (*)(u64, UReg_FPSCR&)>(AlignCode4());
ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
// We know the frsqrte implementation only accesses the fpscr. We manufacture a
// PPCSTATE pointer so we read/write to our provided fpscr argument instead.
XOR(32, R(RPPCSTATE), R(RPPCSTATE));
LEA(64, RSCRATCH, PPCSTATE(fpscr));
SUB(64, R(ABI_PARAM2), R(RSCRATCH));
MOV(64, R(RPPCSTATE), R(ABI_PARAM2));
// Call
MOVQ_xmm(XMM0, R(ABI_PARAM1));
ABI_CallFunction(raw_frsqrte);
MOVQ_xmm(R(ABI_RETURN), XMM0);
ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
RET();
}
u64 (*wrapped_frsqrte)(u64, UReg_FPSCR&);
Jit64 jit;
};
} // namespace
TEST(Jit64, Frsqrte)
{
TestCommonAsmRoutines routines;
const std::vector<u64> special_values{
0x0000'0000'0000'0000, // positive zero
0x0000'0000'0000'0001, // smallest positive denormal
0x0000'0000'0100'0000,
0x000F'FFFF'FFFF'FFFF, // largest positive denormal
0x0010'0000'0000'0000, // smallest positive normal
0x0010'0000'0000'0002,
0x3FF0'0000'0000'0000, // 1.0
0x7FEF'FFFF'FFFF'FFFF, // largest positive normal
0x7FF0'0000'0000'0000, // positive infinity
0x7FF0'0000'0000'0001, // first positive SNaN
0x7FF7'FFFF'FFFF'FFFF, // last positive SNaN
0x7FF8'0000'0000'0000, // first positive QNaN
0x7FFF'FFFF'FFFF'FFFF, // last positive QNaN
0x8000'0000'0000'0000, // negative zero
0x8000'0000'0000'0001, // smallest negative denormal
0x8000'0000'0100'0000,
0x800F'FFFF'FFFF'FFFF, // largest negative denormal
0x8010'0000'0000'0000, // smallest negative normal
0x8010'0000'0000'0002,
0xBFF0'0000'0000'0000, // -1.0
0xFFEF'FFFF'FFFF'FFFF, // largest negative normal
0xFFF0'0000'0000'0000, // negative infinity
0xFFF0'0000'0000'0001, // first negative SNaN
0xFFF7'FFFF'FFFF'FFFF, // last negative SNaN
0xFFF8'0000'0000'0000, // first negative QNaN
0xFFFF'FFFF'FFFF'FFFF, // last negative QNaN
};
UReg_FPSCR fpscr;
for (u64 ivalue : special_values)
{
double dvalue = Common::BitCast<double>(ivalue);
u64 expected = Common::BitCast<u64>(Common::ApproximateReciprocalSquareRoot(dvalue));
u64 actual = routines.wrapped_frsqrte(ivalue, fpscr);
printf("%016llx -> %016llx == %016llx\n", ivalue, actual, expected);
EXPECT_EQ(expected, actual);
}
}
|
