mirror of
https://github.com/ultimatepp/ultimatepp.git
synced 2026-05-16 06:05:58 -06:00
133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
#include <Core/Core.h>
|
|
|
|
using namespace Upp;
|
|
|
|
int Count(const Vector<String>& v, const String& x)
|
|
{
|
|
int count = 0;
|
|
for(int i = 0; i < v.GetCount(); i++)
|
|
if(v[i] == x)
|
|
count++;
|
|
return count;
|
|
}
|
|
|
|
004025A0 push r14
|
|
004025A2 xor r14d,r14d
|
|
004025A5 push r13
|
|
004025A7 push r12
|
|
004025A9 push rbp
|
|
004025AA mov rbp,rdi
|
|
004025AD push rbx
|
|
004025AE mov eax,dword ptr [rdi+0x8]
|
|
004025B1 mov rbx,rsi
|
|
004025B4 test eax,eax
|
|
004025B6 jle 0x402611
|
|
004025B8 xor r13d,r13d
|
|
004025BB xor r12d,r12d
|
|
004025BE jmp 0x4025EC
|
|
|
|
004025C0 mov rax,Qword ptr [rbx]
|
|
004025C3 mov rdx,Qword ptr [rbx+0x8]
|
|
004025C7 xor rax,Qword ptr [rdi]
|
|
004025CA xor rdx,Qword ptr [rdi+0x8]
|
|
004025CE or rax,rdx
|
|
004025D1 sete al
|
|
004025D4 movzx eax,al
|
|
004025D7 cmp eax,0x1
|
|
004025DA sbb r14d,0xFFFFFFFF
|
|
004025DE add r13d,0x1
|
|
004025E2 add r12,0x10
|
|
004025E6 cmp dword ptr [rbp+0x8],r13d
|
|
004025EA jle 0x402611
|
|
004025EC mov rdi,r12
|
|
004025EF add rdi,Qword ptr [rbp+0x0]
|
|
004025F3 movsx eax,byte ptr [rbx+0xE]
|
|
004025F7 movsx edx,byte ptr [rdi+0xE]
|
|
004025FB or edx,eax
|
|
004025FD je 0x4025C0
|
|
|
|
004025FF mov rsi,rbx
|
|
00402602 call Upp::String0::LEqual(Upp::String0 const&) const
|
|
00402607 test eax,eax
|
|
00402609 sete al
|
|
0040260C movzx eax,al
|
|
0040260F jmp 0x4025D7
|
|
|
|
0040261C mov eax,r14d
|
|
0040261F pop rbx
|
|
00402620 pop rbp
|
|
00402621 pop r12
|
|
00402623 pop r13
|
|
00402625 pop r14
|
|
00402627 ret
|
|
|
|
*/
|
|
|
|
For your pleasure, I have tried a little exercise to demonstrate my point. Consider this routine:<p>
|
|
<code>
|
|
int Count(const Vector<String>& v, const String& x) {<p>
|
|
int count = 0;<p>
|
|
for(int i = 0; i < v.GetCount(); i++) <p>
|
|
if(v[i] == x)<p>
|
|
count++;<p>
|
|
return count;<p>
|
|
}<p>
|
|
</code>
|
|
|
|
This involves high level objects, implemented at library level, Vector and String. There are 3 semantic calls .GetCount, Vector::operator[] and String::operator==.
|
|
|
|
It gets compiled into this piece of code:
|
|
|
|
<code>
|
|
004025A0 push r14 <br>
|
|
004025A2 xor r14d,r14d <br>
|
|
004025A5 push r13 <br>
|
|
004025A7 push r12 <br>
|
|
004025A9 push rbp <br>
|
|
004025AA mov rbp,rdi <br>
|
|
004025AD push rbx <br>
|
|
004025AE mov eax,dword ptr [rdi+0x8] <br>
|
|
004025B1 mov rbx,rsi <br>
|
|
004025B4 test eax,eax <br>
|
|
004025B6 jle 0x402611 <br>
|
|
004025B8 xor r13d,r13d <br>
|
|
004025BB xor r12d,r12d <br>
|
|
004025BE jmp 0x4025EC <br>
|
|
|
|
004025C0 mov rax,Qword ptr [rbx] <br>
|
|
004025C3 mov rdx,Qword ptr [rbx+0x8] <br>
|
|
004025C7 xor rax,Qword ptr [rdi] <br>
|
|
004025CA xor rdx,Qword ptr [rdi+0x8] <br>
|
|
004025CE or rax,rdx <br>
|
|
004025D1 sete al <br>
|
|
004025D4 movzx eax,al <br>
|
|
004025D7 cmp eax,0x1 <br>
|
|
004025DA sbb r14d,0xFFFFFFFF <br>
|
|
004025DE add r13d,0x1 <br>
|
|
004025E2 add r12,0x10 <br>
|
|
004025E6 cmp dword ptr [rbp+0x8],r13d <br>
|
|
004025EA jle 0x402611 <br>
|
|
004025EC mov rdi,r12 <br>
|
|
004025EF add rdi,Qword ptr [rbp+0x0] <br>
|
|
004025F3 movsx eax,byte ptr [rbx+0xE] <br>
|
|
004025F7 movsx edx,byte ptr [rdi+0xE] <br>
|
|
004025FB or edx,eax <br>
|
|
004025FD je 0x4025C0 <br>
|
|
|
|
004025FF mov rsi,rbx <br>
|
|
00402602 call Upp::String0::LEqual(Upp::String0 const&) const <br>
|
|
00402607 test eax,eax <br>
|
|
00402609 sete al <br>
|
|
0040260C movzx eax,al <br>
|
|
0040260F jmp 0x4025D7 <br>
|
|
|
|
0040261C mov eax,r14d <br>
|
|
0040261F pop rbx <br>
|
|
00402620 pop rbp <br>
|
|
00402621 pop r12 <br>
|
|
00402623 pop r13 <br>
|
|
00402625 pop r14 <br>
|
|
00402627 ret <br>
|
|
</code>
|
|
|
|
Now the fast path of loop gets compressed into opcodes at the range 004025C0 to 004025FD - 64 bytes total. GetCount gets completely out of loop, operator[] is reordered to direct pointer increments (at 4025E2) and unless slow-path is necessarry (004025FF - 0040260F), there are no calls at all. (Note: slow-path is invoked is Strings do not satisfy SSO).
|