Visual Studio 2008 Part 22

[過去ﾛｸﾞ] Visual Studio 2008 Part 22 (314ﾚｽ)
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191: デフォルトの名無しさん [sage] 2018/09/15(土) 20:37:06.43 ID:UR1d6CKz

ソース：
#include "stdafx.h"
#include <math.h>
using namespace System;

template<typename T> static double calc_norm_and_regulate(int num, T* r, bool regulate){ // <float> for debug.
double norm = 0;
for (int i=0;i<num;i++) norm += (double)r[i] * (double)r[i];
norm = sqrt(norm);
if (regulate) for (int i=0;i<num;i++) r[i] = (T)(r[i]/norm);
return norm;
}

int main(array<System::String ^> ^args)
{
int count = 16;
__int64 inputs_hex[16] = {
0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x1fedb1530240aa54,
0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x1ff0af0d95025bc3,
0x1fc9353df6af376b, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000,
0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000};
double* inputs = (double*)inputs_hex;
double norm = calc_norm_and_regulate(count, inputs, false);
Console::Write(String::Format("{0:F6}, 0x{1:x16}\r\n",norm, *(__int64*)&norm));
// Release build
// 0.000000, 0x1ff68ddfb62221dd from IDE
// 0.000000, 0x1ff68ddfb62221de from command prompt
return 0;
}

http://mevius.5ch.net/test/read.cgi/tech/1413180800/191

235: デフォルトの名無しさん [sage] 2018/09/16(日) 16:37:19.30 ID:zL1WUjLu

>>231
逆アセンブラ

for (int i=0;i<num;i++) norm += (double)r[i] * (double)r[i];
00000033 33 D2            xor         edx,edx
00000035 89 55 E8         mov         dword ptr [ebp-18h],edx
00000038 90               nop
00000039 EB 03            jmp         0000003E
0000003b FF 45 E8         inc         dword ptr [ebp-18h]
0000003e 8B 45 E8         mov         eax,dword ptr [ebp-18h]
00000041 3B 45 FC         cmp         eax,dword ptr [ebp-4]
00000044 7D 1B            jge         00000061
00000046 8B 45 F8         mov         eax,dword ptr [ebp-8]
00000049 8B 55 E8         mov         edx,dword ptr [ebp-18h]
0000004c DD 04 D0         fld         qword ptr [eax+edx*8]
0000004f 8B 45 F8         mov         eax,dword ptr [ebp-8]
00000052 8B 55 E8         mov         edx,dword ptr [ebp-18h]
00000055 DC 0C D0         fmul        qword ptr [eax+edx*8]
00000058 DC 45 F0         fadd        qword ptr [ebp-10h]
0000005b DD 5D F0         fstp        qword ptr [ebp-10h]
0000005e 90               nop
0000005f EB DA            jmp         0000003B
norm = sqrt(norm);
00000061 DD 45 F0         fld         qword ptr [ebp-10h]
00000064 83 EC 08         sub         esp,8
00000067 DD 1C 24         fstp        qword ptr [esp]
0000006a E8 0D 50 7B FF   call        FF7B507C
0000006f DD 5D D8         fstp        qword ptr [ebp-28h]
00000072 DD 45 D8         fld         qword ptr [ebp-28h]
00000075 DD 5D F0         fstp        qword ptr [ebp-10h]

http://mevius.5ch.net/test/read.cgi/tech/1413180800/235

252: 240 [sage] 2018/09/16(日) 21:43:27.78 ID:/oSJzlqn

static版
0000000e 33 C0            xor         eax,eax
00000010 85 F6            test        esi,esi
00000012 7E 16            jle         0000002A
00000014 DD 04 C7         fld         qword ptr [edi+eax*8]
00000017 DC C8            fmul        st(0),st
00000019 DC 05 00 30 CC 00 fadd        qword ptr ds:[00CC3000h]
0000001f DD 1D 00 30 CC 00 fstp        qword ptr ds:[00CC3000h]
00000025 40               inc         eax
00000026 3B C6            cmp         eax,esi
00000028 7C EA            jl          00000014
0000002a DD 05 00 30 CC 00 fld         qword ptr ds:[00CC3000h]

非static版
0000000e D9 EE            fldz
00000010 33 C0            xor         eax,eax
00000012 85 F6            test        esi,esi
00000014 7E 0C            jle         00000022
00000016 DD 04 C7         fld         qword ptr [edi+eax*8]
00000019 DC C8            fmul        st(0),st
0000001b DE C1            faddp       st(1),st
0000001d 40               inc         eax
0000001e 3B C6            cmp         eax,esi
00000020 7C F4            jl          00000016

http://mevius.5ch.net/test/read.cgi/tech/1413180800/252

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