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Testing Inline ASM-VB
Strings
Math
General
Memory Search
Using inline ASM
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News
Files Visual Basic
Strings
Math
General
Properties
Memory
Methods Search
Testing Inline ASM-VB
Strings
Math
General
Memory Search
Using inline ASM
Submit!
ASM StrLen vs Len()This piece of inline ASM code will return the length of the string. It returns the exact same length on strings like the native Len() function. It seems that there is no real speed improvement overhere.
Notice that my string length was 15888. (although that doesn't really matter in this code)
Simply call this code like you would do with Len(), eg:
strLen = mdlASM.strLen(strTest1)
User contributed notes:
|
Public Function strLen(sIn As String) As Long ';This is working. Returns the length of the input string. JS '#ASM_START ' ' push ebp ' mov ebp, esp ' push ebx ' push esi ' push edi ' ' mov eax, [ebp+8] ' mov ecx, [eax] ' xor eax, eax ' mov ax, [ecx-4] ' cdq ' sub eax, edx ' sar eax, 1 ' ' pop edi ' pop esi ' pop ebx ' mov esp, ebp ' pop ebp ' ret 4 ' '#ASM_END End Function |
Simply call this code like you would do with Len(), eg:
strLen = mdlASM.strLen(strTest1)
| LCase$ % faster than ASMLCase | LCase$ (sec) | ASMLCase (sec) |
| 12.1% | 0.06358 | 0.056693 |
| 6.5% | 0.0593 | 0.055694 |
| 23.2% | 0.069963 | 0.056776 |
| 7.2% | 0.061476 | 0.057351 |
| -18.4% | 0.058873 | 0.07217 |
| LCase$ % faster than ASMLCase | LCase$ (sec) | ASMLCase (sec) |
| -0.9% | 0.597489 | 0.602938 |
| -5.4% | 0.614723 | 0.650017 |
| -9.6% | 0.588754 | 0.651291 |
| -4.2% | 0.587962 | 0.613989 |
| -2.9% | 0.591222 | 0.609115 |
User contributed notes:
| Author: grigri (grigri at deadparrot dot co dot uk) | Date: 19:11 20/11/2005 |
| Why are you pushing and popping esi and edi in the prolog/epilog, since you're not using those registers? Removing them would probably incur a speed increase. | |